Unplugging evo gmt400 Not the steering column,. 3L and 5. After calling around, I found that GM had a kit that eliminates the EVO all together and replaces it with a simple bypass line. I'm having a bypass kit installed in the red truck on Monday so I'll be able to compare it directly to my Suburban, which still has functioning EVO. Reactions: White96k2500, Caman96 and Orpedcrow. Joined Sep 28, 2013 Messages 12,063 Reaction score 21,030 Location Houston TX. I ordered the hose and plan to has anyone with a 98 done the flaming river mod the more research i do the more i question myself this person says it will work the next says it will bind i want to know if someone deffinitly knows it works or not Ive done the flaming river Never seen nor heard of a 1996 GMT400 having EVO. Hey guys, I'm new here. I believe some 97 might gave had evo too but no 96s. I find it hard to believe that you don't notice any difference in steering effort with the column sensor for the EVO unplugged. You could also bypass the EVO, but I'm not sure a 96 has it to begin with. If you'd rather bypass the EVO (which is what I would recommend) you can install the GM EVO bypass kit (19168825) or equivalent. It had bald BFG ATs and a shot steering system. It is the same circuit. Also will this effect the ECM at all. The hoses were replaced a couple of years ago, at the most, so I doubt that's the source. Admittedly I've not driven a non-EVO GMT400 but if it has that level of assistance at slow speed at higher speed also I doubt I'd like it. Check to see if your power steering pump has the EVO(Electronic Variable Orifice). it seems as though the bucking ended ( i thought maybe it was the fuel injector wiring on the bank 2 side) but unplugging the maf should have had the bucking continue. I bought it running poorly so I cant really give a history on it. I assume your truck is a 3/4 and you have the factory hydro with rear drums? Yes it's a 3/4 ton with factory hydro. Personally --- I would do a direct swap for the 3/4t setup for the series your truck is. IMPORTANT: Erase the PASSLOCK(TM) related Diagnostic Trouble Codes (DTCs) that are stored in the VCM/PCM. Found a photo of it next to the EVO Delete U-pipe. Hey all. I got the part # for the EVO solenoid delete and also found some good info on another forum regarding the delete. You can try unplugging the vacuum line from it, but if it's opening when it shouldn't because of a broken internal spring, that won't necessarily stop it. Richard . I had to cut the pressure hose to get it out. Both feel about the same now, and it was not a dramatic difference from properly functioning EVO in either case. I had to replace the PS pump, so I just got the new pump with the bypass pipe installed. not a fuse and pretty sure it's not the button because it not only lights up but try's to switch it outta 4 low it just cant and eventually stops. The high pressure cutout on the rear of the compressor itself should interupt the ac request signal to the PCM in the same manner as the dash switch. I guess in a way it's an early "BCM" of sorts though I'm reluctant to use that term for it as it's probably giving it too much credit. 7 with 4l60e, with 215k/231k miles. Log in Register. 7. Another thing you could do is check local junk yards. I fought to keep the EVO functional in my '97s for way too long, replaced the column sensor in both multiple times. Steering is a now a bit lighter than EVO was overall IMO but it's not a huge change. You'd expect there to be some kind of module associated. 7L 350cid V8 > Steering > Steering Gear So far their ABS is still working OK, but I'd like a long term solution in case they decide not to. Am I correct in thinking all I need to do is swap to a 96 pump and high pressure line? Unplugging it will do the opposite of helping. Thread starter NORCAL SS; Start date Jan 11, 2011; Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. I don't know if this one did because the PS pump wasn't in the truck when I pulled it. The 1988 - 1998 GMT400 Chevy & GMC Pickups Message Board Register or Log In To remove these advertisements fuse 4 is the 12v feed for the drl module, the instrument cluster, and the passlock/evo(electronic variable orifice) module. I disconnected the pigtail for the sensor at the pump,because it failed and gave the icing feeling described in the forums (gmt400 evo delete),unplugged the steering pump will go Redhead box / Cunningham solid U-joint steering shaft / mevotech Ttx tie rods / moog pitman and idler arm and definitely opt for a 96’ year model Ps pump and 96’ year pressure hose and by pass all the evo junk if you have it . For 98's Passlock purposes, GM refers to it The response time seemed way longer than the OBDLink MX+ and the native app didn't pull VATS/EVO codes. Maybe this is all in my head but I swear it makes more power before it comes all the way up to temp around 160-70 is where I feel it makes the most power. About the cheapest way to find out is to temporarily eliminate the EGR valve. I had the EVO on my 1998 Suburban. With the park/neutral position switch in park and the stop lamp switch closed (foot of the brake) the circuit to the BTSI solenoid is completed to lock out the shifter. Some people like EVO, some hate it, some like me don't care either way but it is prone to failure. The elimination kit is just a 180° bent line to get around to the back of the pump & then attaches to the original line where the EVO previously did. Steers easier than my old 85 Riviera. Jul 8, 2017 Thanks guys, I feel silly mentioning this, but I was unplugging the wrong wire plug that was further down on the wire loom, the wires are dirty and hard to tell their color. So I put the new power steering pump (Delco reman with EVO bypass) back on and core returned the original. You could replace the rag joint with a u-joint. Discuss bags, links, spindles and traction adders. 1998 I did end up unplugging the MAF sensor 3/4 of the way home, unfortunately not during my highway test. It's troubling. I swapped my vacuum brake booster over for a hydroboost unit a while back. I don't believe that automatically assuming he does have it is helpful, as it's very unlikely that he doesn't. Our son has a 98 K1500 with 18” rims that the previous owner installed. Has anyone tried or even know if it's possible to install the evo bypass kit without removing the power steering pump? From looking at it from Well only being on the fourms for a few weeks now and have had the abs issue where they engadge going under ten mph is this why people delete their abs system all together? And if there is a simple fix to this without dismantling my whole brake sytem im open to anything. That is the only thing I can come up with. Looks like I'm going to have to stockpile some junkyard parts, I'm I keep having the same issues with my 88 tbi and I'm wondering what would happen if it were driven with the timing connector unplugged? I don't have much time to trouble shoot, don't have much time to get online and check questions from old threads and such either. Apr 14, 2012 #2 4. Reactions: Road Trip and HotWheelsBurban. GMC > 1990 > K1500 PICKUP > 5. Site Info. Do away with the evo by adding a 96 style pump and high pressure line . I would a agree that the '96 pump and pressure line is a better fix which is why I That sensor is called the EVO* sensor if I recall correctly, I've read about people having problems with them before :imo . Go to GMT400 r/GMT400. everything is new, brand Now on 88-94 if your factory radio head unit is still in place above the gas pedal then you need to drop it down out of the way temporarily, on 95+ there is a bracket above the gas pedal that hold's the optional factory keyless entry unit as well as a couple of other relay's, it is held in place by 2 15mm bolt's and one small 7mm bolt, you need to drop it down enough to The reason I ask is what you two stated about unplugging things to "test the feel without EVO. First question, I need a pressure line and pump for a '96 right? It is my third RCSB GMT400. My '97s are both early and they both have it. The replacement pumps come with a flow control valve attached that appears to mimick the older gen setups. I didn't think about changing that valve limiting the pressure to the booster. Finally gave up and bypassed the EVO, and I don't miss it one bit. Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. Your new one already has the proper fitting for the pre-97 line. You may be able to swap the valve in the pump with one Has anyone tried or even know if it's possible to install the evo bypass kit without removing the power steering pump? From looking at it from above it looks like it is in a tight I wonder if you could use a pressure hose from an 88-95 truck by removing the Evo valve and screwing the hose directly into the pump. New posts GMT400. Here's what I'm unsure of and think might be the problem. Even when noy moving it is super easy to turn, almost loose feeling Sent from my SM-G950U using Tapatalk . And the steering wheel sensor is at the bottom of I'm wanting to delete the evo on my 97 burban k1500 5. Jul 15, 2024 #12 B. Should I bypass the evo? Or what is the fix for this. It had perfect assist before all of this was replaced. I'm probably going to try and drill out the hose fitting on the back of the pump a little. There is a way to delete the EVO valve by taking the PS pump off and removing the electronic valve guts out. Borgeson might have something. Unfortunately I'm having a difficult time finding an operating pressure for the GMT800 rack so I can't tell you for sure, but I'd be willing to bet that your pump outputs a higher pressure than is needed for the rack, and possibly more than it can handle. Those valves have nothing to do with the EVO, but everything to do with the feel/weight of the steering. I thought someone here may find it interesting, since many GMT400s were equipped with EVO. Its really facking annoying. The truck came from the factory with a 350, I have not been able to verify that it still has the org engine though. OR Install a power steering pump and pressure line for a '96 truck. The good news is, if the DRL indicator on the cluster bothers you, on a GMT400 it's cake to just pull the cluster and remove that one bulb. I'll have to give that some thought. GMT400 Contact us; I will agree that the EVO works great when it's operational, but my experience has been that it doesn't stay that way for long. To be sure the circuit 100%, the electronic brake control and the evo module should probably be disconnect, then test the circuit for a fault to ground or +battery. Threads 7 Messages 17. EVO was abandoned by GM and there are tech bulletins to remove it from the system, but a bypass pipe is required. EDIT---Then again that also does not even make sense to me. First, is this normal? Secondly, I'd like to find a way to stop this. The steering gear boxes are also different between the 96 non-evo gears and the 98-99 evo equiped gears. Members. If your PS pump is still good, you can get just the bypass pipe. df2x4. Reactions: HotWheelsBurban. Looks like my EVO sensor on my PS pump is leaking. GMT400 Forever! Joined Mar 21, 2015 Messages 2,084 Reaction score 3,330 Location Longview, TX. My girlfriend drove it the other day for the first time and didn't really like the steering. It was scary. COM. However, there was a great amount of improved acceleration (NOT HORSEPOWER). Try unplugging either one before replacing the pump. May 30, 2024 #8 AuroraGirl I'm Awesome. Yes,I know it's been done a million times and I'm still confused, but the block is set up to be dropped in, and the task of dealing with the wiring harness and ecm is daunting and preventing me from moving on. Although my K2500 is commonly referred to as the "3/4 ton Suburban" it is supposedly built on a frame derived from the K3500 truck and has the K3500's 1-ton chassis, suspension and brakes. Feb 20, 2024. Perfect fit w/no mods. I've never had a GMT400 with evo besides this on so I don't know what a properly working system is like. Nov 24, 2013 #6 someotherguy even worse in person. Ie. I deleted my EVO power steering a couple years ago on my suburban. On the 97 and newer there was an EVO sensor attached to the power steering pump. I can steer GMs without EVO with 1 finger. Cunningham machine steering shaft and this bearing,will take out any steering wheel to steering box play,Yes you have to remove the steering sensor for the bearing. I don't know if there is any difference in the boxes between EVO and non-EVO. Otherwise I'll probably just swap the steering speed sensor. Jake these are the parts to delete the evo stuff at the pump. I have a 1998 1/2 ton 4WD with the EVO power steering system on it. It very well could be. Seems I am hooked also. Who knows what sitting the 10 or so years could have done to it. Hey guys, if i start unplugging sensors while the engine is on, shouldn't that noticeably change the way it's running? I tried: -Unplugging the o2 sensor (on the driver side header): No change -Unplugging the IAC (which i also just soaked in cleaner): No change -Taking the vacuum line off I have a 95 Chevy with the 5. you can tell if your sensor is bad just by unplugging it and I looked it up and found out about this EVO sensor and asked him if he change it and he had no idea what I was talking about. I've had a lot of these trucks apart but never knew the 97 used that module for the EVO. All the diagrams I have seen show it as a purple wire. If you have a GMT400, swap for a GMT400 and then you don't have to worry about the setup working with your vehicle. The power steering pump or one of the lines has developed a pretty good leak. I was just pointing out that you do not need the '96 pressure line if you use the kit. I can't find an issue with the physical wiring. But I've only owned a How to upgrade the Evo power steering pump and gearbox fit beter handling on my 97 chevy c1500 truck. Not sure how you figure that's on the pump. EVO has been deleted previously using the GM kit, and I'm suspicious that my leak may be at the extra connection the kit introduced. Latest: Supercharged111; 13 minutes ago; Best thing I did for my EVO, was to get ride of it. There is one available from a company called something like Flaming River. I am going to validate that unplugging the defogger connection to that board does not impact it working. 7 4wd This seems to be one of those electrical gremlins that only guys familiar with these rigs can figure out. Jan 2, 2023 #3 SAATR Location Loo E Z an uh. I've driven both of my '97s on the highway with the column sensors unplugged and it was unpleasant to say the least. You may need to remove it and either buy or make a blockoff plate to use as a test. I have read alot about the steering postion sensor or evo sensor being the main problem I was wandering if anyone has done this before and has detailed instructions on how to replace it. 0 and another mustang. Has anyone tried tuning their vortec 350/454 with a laptop? What application do you use? Is there an OBD2 cable to buy? The reason I'm asking is I'd like to start tuning myself after my rebuild is complete. I have yet to check the cable to my starter, or the ground strap for the starter to frame. Both of my trucks have had the EVO fail at the most inopportune times. If unplugging it won't allow to shift, just take it off. I'm replacing the power steering pump in my truck tomorrow morning and will be bypassing the EVO system. I plugged it back in the same day. Gmt400 noise. EVO sensor and they are a stupid worthless POS, I am unplugging mine during my build and if it dissables the function it will never be plugged in again The EVO valve is not on the pump I have. Which means it is an electronically variable orifice in the power steering system. More info on that topic here When I rev the engine, the reading on the volt meter does not change, unplugging or jiggling the single brown wire to the alternator has no effect. I don’t know what width the rims are (they aren’t GM rims) but the tires stick out probably 1-1. The C1500 is ridiculously overboosted in its steering. What's new. 67-72chevytrucks. The EVO, along with other sensors, enabled the steering feel to be varied, from "light" (easy to turn) at low speed, e. he said the truck was unsafe to drive master cylinder is UNSAFE when used on the GMT400 with Low-Drag calipers. New posts Search forums. In this other photo I found It looks like it's not impossible to pull the servo coils from the stem and gain easy access to the nut. You can just tape up the plug, it should not Look for a connector under the vehicle on the power steering pump. Right down to the speed the EVO starts giving full assistance and the pedal fell to the floor. The usual "fix" is to remove the EVO (electronically variable orifice) from the pump and replace it with a fixed orifice. Ever since I got the truck there has been a slight steering jump Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. They are known to go bad and cause the power steering to be too powerful at high speeds and it makes the steering feel real loose. The power steering pump had started leaking at the pressure hose and power steering went completely away. Mine did but I removed it when I swapped to hydroboost brakes. Mileage is 28X,***. Can someone with experience talk me through this process of either I tried unplugging the valve before I changed the last pump and removed it altogether. , for parking the vehicle, to "normal" for higher-speed (30MPH and above, thereabouts) operation. I kept the solenoid and i am thinking of reinstalling it. Hello. Steering position sensor is the usual problem. Had the Passlock tuned out at a local shop and did the EVO delete myself. It's a 1998 k1500 5. If one of those or both the MAP & MAF sensors are plugged in upon starting it sputters and barley runs, bogs down even more under acceleration. Stupid camber question. Technically you want all of these pieces out of a non-evo pump to properly delete the EVO. The EVO control valve on the back of the pump is a potential leak point. There is way too little effort needed Taking the fuse out or unplugging the case connector puts it in limp mode which is 3rd gear (sol A and B are both normally off in 3rd gear). 11 votes, 19 comments. It is my third RCSB GMT400. While I don't have the numbers in front of me, I'd be a little worried about using the factory pump for a rack and pinion. GMT400 Contact us; Looking at the video (post#2) it appears as though the DRL indicator on the dash still illuminates (even after unplugging the DRL module), until the headlights are switched to on. Interesting. Just wondering if I’m crazy or The only other thing I can think of would be if it has evo ps ( I think that’s what it’s called) I believe they put it on 97 up it’s some sort of metering deal that causes a lot of issues, enough issues that they made a bypass kit for it but I don’t know a lot about that system. How does a truck actually behave after deleting EVO compared to when the EVO system is intact and functional? The reason I ask is what you two stated about unplugging things to "test the feel without EVO. Been digging some more to try to find out what the EVO valve looks like off the pump. 12K subscribers in the GMT400 community. I did not want to do that because it results in maximum hydraulic boost and a light steering feel at all times. If changing the PS pump to a pre EVo pump will do that, then that is what I will do. also tried unplugging the button with it on. So by simply unplugging it, that should stop the weird jerk when turning? Also just incase I'm misunderstanding unplugging it will not hurt the steering Forums. I've bypassed the EVO on both of my '97s using each of these methods and I can't tell a difference between them in function/performance. 1998 GMT400's are the first year for Passlock antitheft in these trucks, and the TDM Memory getting fuzzy. Looks like a crowsfoot would easily go around it. I wanted to update this thread because I think this situation may be at least partially related to my aftermarket remote start systems. I was rummaging through some old computer files and I found this Delphi Electronic Variable Orifice ("EVO") 2-page slicksheet with copyright date 2005. Otherwise Checking RockAuto, it appears the reman replacement gears available there apply from 88-99. If '97 was indeed a split year for EVO it must have been extremely early. I wonder though given the dislike of EVO heaviness at speed if this isn't a cultural divide across the Atlantic. I decided to take a risk today and cut the "flap" off of my throttle body blade. It works grate. Less points to leak and it will leak ! The "EVO" controls the flow rate/ pressure on the latter gmt400's at low speed it is supposed to allow more fluid than at higher speeds. If it is how do I do it. My problem is that I cut I used the “flow control orifice / union” that GM selected to provide in their “EVO delete” kit (kit’s p/n - 19168825). Attention all members. L. As stated the EVO system is designed to provide more assist at low speed operation. With EVO you've got the device in the pump reservoir and the sensor on the column, other than that I don't know. I still have EVO, so I don't have direct experience doing this. Replacement pumps seem to be missing this part, and GM seems to recommend deleting it as it caused issues. Nope no cel's I had already deleted the EVO before,These will also fit the gmt800's. i do have power to the actuator up front so i do know that. I just replaced my pump with a reman that comes with the S pipe AKA EVO bypss pipe in the box. df2x4 said: EDIT - Maybe GM had the PassLock/EVO modules ready to go and started throwing them in trucks that weren't even equipped with PassLock? I recently removed the power steering pump from my 97 K1500 5. Aug 12, 2019 #17 S. I live on base out here in Yuma and there’s an auto shop the GMT400 5. 7 and 700r4, I'm converting to carb. Aug 18, 2022 #9 1998_K1500_Sub Nitro Junkie. The bypass pipe alone is like $60, so the pump with the pipe, is IDK $50 or $60 more. The only difference is the fitting at the back of the pump where the EVO was attatched. My 99 Suburban was the last year to be built on the GMT400 platform even though the last year for the pickups was 98. So as long as your steering speed sensor (the one on the column) is working, and you're still not getting good assist at low speed, then your pump is likely worn out. I'm going to remove them and go back to the factory keyless systems. THe EVO sensor is on the PS pump on the 99. Regarding the PassLock delete As mentioned briefly above, this kind of sounds like an EVO issue. I had a customer with a similar problem about two years ago in a 95 and his PCM turned out to be the problem. Plugging back up means that the ECU takes over timing after 400 rpm. This is how I have been running mine until i get a new box from companies The EVO module on the 97s is its own unit 98+ is a combined EVO/PassLock module. Both are 1500's, 5. Got a whole new block and everything. So I tried unplugging my Vacuum line running to the EGR, didn’t notice any difference. When it works it's great, but when it goes wrong it usually does so when you're on the highway changing lanes and scares the crap out of you. Continental Hose Kit Review. I'm in favor of reinstating properly functioning EVO in the 1500 now having never felt it in the 1500. Steering has a good amount of resistance without needing to grape ape the thing into a parking spot. With EVO disabled it steers with 1 finger like older GMs. When I did mine and built the parts list for everybody, all the parts were from a 3/4t suburban. Supporting Member. If you bypass the evo, you will have very assisted steering. 7 tbi lightly modified. Hey all, is it possible on a GMT400 to do a proper power steering delete? Because I know steering a vehicle intended for PS with it disabled is harder than steering a vehicle that never had PS. I just did the EVO delete on my red truck, there are two ways to go about it. Yes, I should’ve mentioned that. If it does you could buy the 15-72266 one time for the harness and when the board fails again, just replace the controller portion with your favorite number and use your very expensive harness. GM makes the delete kit for a reason. Not the same without you buddy. Seems like the delete did little to nothing as far as "firmness" in the The EVO (Electronic Variable Orifice) It is the easiest turning gmt400 ive ever drove. I recently replaced my engine, power steering pump and did the evo delete. Lowered and Bagged Suspension. And does not cycle at all when plugged in. I don’t like them at all. I see some on the bottom of the pump where the line threads in on the bottom/front (It's an EVO system). Potential gmt400 purchase. I hope my post isn't out of place. Site Updates and THE RULES. Sep 29, 2024 #7 burbanswervin Well, as the title implies, my truck still provides lighter power after I turn off the ignition. Joined Jul 14, 2024 Messages 5 Reaction score 2 Location Yuma AZ. Apr 17, 2024 #34 Caman96 OEM Baby! Supporting Member. RIP Jason. Jun 5, 2024; kennythewelder; Street and Track. The kit is GM #19168825. I'm lost on how to fix correctly or upgrade everything and what all this intels. I have neither a p/n nor the gal/min rating of the flow control orifice. comments on 1ROAD's video and his own updated video on the updated Dorman 905-512 failing after a year or so and bringing the clunking back,This has 4 set screws that hold the shaft solid . For the next 2 miles I never touched the brakes (plenty twists but I just carried the speed) until I came to the end of my driveway and used them lightly to check the last bit of speed (I'd coasted in for the main part) for the tight turn. " I've never unplugged the solenoid on the pump, but I have unplugged the column sensor which puts the system in full boost all the time. Use this subreddit to post pictures of your GMT400 trucks, show us your mods, or ask for advice. I put my old power steering pump (with EVO) back on and it was no better, so I figured it had to be a bum steering gear. My Simple EVO Steering-Feel Modification Some have chosen to disconnect their EVO plug on the back of their power steering pump for various valid reasons. I'm replacing the power steering pump on my brother's 98 C1500 and was looking into deleting the EVO unit but unsure about the pressure hose needed. Driving down the highway with the EVO in full boost does not feel safe to me at all. GMT400 Contact us; Not to drag the conversation back to EVO but I'd like some clarification here if anyone can provide it. Agreed for the most part, although I will say that I just did the EVO delete on my red truck and it definitely has more assist at highway speed now than it did with the EVO intact. also tired unplugging the front acutator. At To the point that the steering doesn't even want to return to center at slower speeds. They've figured out that the EVO is problematic. Upon The actual brackets should be pretty easy to source as the same set was used on GMT400 and '94+ S10/Blazer 4. If I don't like that I might put the EVO valve back in and see if it is any better. This could be an opinion thing, but if anyone has experience either way and could tell me how it’s been for them that’d be awesome thanks! I would just remove the valve on the pump and replace it with EVO Steering Bypass Kit From GM. " Hello I see a lot of people asking about Hydroboost swap's, so I thought I would do a little write up on one of these swap's. Nothing is obviously binding when watching from underneath and everything was torqued to X2 on deleting the EVO steering with '96 parts. I was just wondering if anyone has done this and how it worked for them. In that you have a 97 and later with the EVO, you need to see if someone unplugged the steering sensor below the column under the dash. I do not understand how the dash switch works yet unplugging the high pressure cutout does not. GMT400 Contact us; I found just the opposite. 7L appears to use the old-style EGR valve / vacuum motor. GMT400 - The Ultimate 88-98 GM Truck Forum. Joined Nov 4, 2018 I recently purchased a 1990 GMC C1500. Reactions: Road Trip and burbanswervin. I believe the issue with just unplugging the ABS module is that if air gets trapped in it you'll have no way to bleed it out, I could be wrong though. The system works grate without the EVO. That worked for a while, but doing so puts the pump into full Unplugging the sensor on the power steering pump will allow full power assist full time. I have 2 1999 Subs, both are the same truck except one is a RWD and the other is an Autotrac 4wd. I would call Redhead, as already suggested, and ask them about the proper lines to buy, or if the boxes are any different. FWIU removing the EVO properly feels much better than just unplugging it. Gibson said: I I never had that issue with my 93. No, not necessarily. Usually a bad sensor (on the steering column) can make the steering suddenly slip as though you hit a patch of ice and then return to normal. If that system has failed then it could in theory stop flow out of the pump or at least limit it to the point the power steering will not work . Added a pic, felt lonely with out it! To those who don't heed steps 1, 14, & 15, you will have to use that fork a few times to get it right! I had to go fill my truck up to make sure I was getting it right. ADMIN MOD Evo bypass . I think I'd like to take this opportunity to install a pre-EVO pump and pressure line instead of using the GM EVO delete kit on my stock '97 pump setup. S. Kits for doing this were once sold by GM but have been I don't care for how overboosted GMT400s are stock, so my Tahoe Limited has the EVO delete and an early steering box - and it actually has some feel to it! If you like light steering, stick to the later box. Either you can use your factory power steering pump/lines and buy the GM EVO delete kit (which is Is it possible to put in an evo bypass without removing the pump. Wifes TBSS Vs evo/2011 5. What I can say is that the if the key detection cable is disconnected from at the ignition cylinder housing module the security light on the dash will still come one, but the burb will still start and run normally. New posts Latest activity. I also tried Unplugging the low pressure switch attached to the manifold on the high side ac line and the clutch was still engaged. Well worth the extra money IMO. The EVO/PASSLOCK (TM) module; The PASSLOCK(TM) sensor; The VCM/PCM; The EVO/PASSLOCK (TM) module will set the DTC B3031 in the learn mode when entering the reprogramming procedure. gmt400. I discovered the ecu bypass tan and black wire/plug under the tee The following procedure allows for anyone to reprogram the EVO/PASSLOCK module learned data code with any tools, other than the scan tool, when any of the following parts are replaced: The EVO/PASSLOCK module The PASSLOCK sensor The VCM/PCM The EVO/PASSLOCK module will set the DTC B3031 in the learn mode when entering the ^ The EVO system that '97+ got is the only difference I can think of. I bought a 97 K1500 a few years ago. Joined Jul 17, 2020 Messages 9,708 Reaction score GMT400 Contact us; I agree on checking the box and the steering shaft for play. After getting everything back together, I noticed that the gas pedal was extremely stiff and almost made it impossible to drive. I just rebuilt the box and pump on my 98 C1500. www. The pumps I'm looking at are the EDELMANN 6140R (supposedly has the bypass fitting already but doesn't show in pictures) or the BBB Is it possible to put in an evo bypass without removing the pump. JasonPayneMemorial. I sometimes forget to turn off a random radar, phone charger, or inverter. A normal pump is light ALL the time like any older GM, where the EVO is heavy at highway speeds. This will put the EVO system in full boost and should make your steering feel loose and effortless, sometimes accompanied by the wandering feeling you If doing the EVO delete properly resulted in the same level of steering boost as unplugging the column sensor I can't imagine GM would've ever recommended it. The difference between the setup's are, vacuum assist brakes use engine vacuum in a stored chamber to assist the vehicle in stopping, hydroboost uses hydraulic pressure from the power steering pump to the the hydro boost booster to assist in That transition between the 2 was the worst. Having experienced that in both of my '97s, I can tell you it sucks. Registered members Current visitors. The switches are new. Watching videos of an alternator replacement on a 1996 truck seemed to indicate that plug only uses one Unplugging that wire is part of the process of setting base timing. If contaminated with debris or malfunctioning it won’t open or close according to vehicle speed. r/GMT400. I bought it and put it on and now the power steering is completely inoperative. Replies 20 Views 6K. If you think it's possible then I'd suggest you ask OP if he has it, direct him how to determine this, then proceed. Even after months of getting used to it, I HATE the feel of the steering. Unplugging the sensor on the power steering pump will allow full power assist full time. com No power steering when you actually needed it. The sensor commonly goes bad and a lot of people will just unplug the sensor giving full boost all of the time creating super light twitchy steering. Thread starter xAFNYx; Start date Apr 21, 2022; Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you want to gamble on fixing the issue, replace the steering sensor on the column that was mentioned earlier. Members Online • Any_Professor6607. I'm looking at replacing the pump and lines all at the same time. If you click them and make a purchase, we may earn a small commission. I just put on a set of 285/65r18 Nitto trail grapplers and have a question about how they “should” handle versus Try unplugging the MAF then starting the truck, this will illuminate a CEL the second time you start the truck, this should put the truck in speed density (doesn't use MAF) mode so you can confirm if this is a MAF issue. I would like to use that volume behind the dash for a 12 to 24V converter. Well, I should perhaps give my point of reference. Thread starter burbanswervin; Start date Sep 29, 2024; Try unplugging your transfer case shift motor and see if you still get the noise with it unplugged while connecting the battery. The steering WAS tight but overboosted, with the occasional freak-out moments of severe I'm not sure if you have the EVO option on that 1996, but if you do there may cause some concern in the level of boost or *feel* when using the 1990 gear. at slower parking lot evo. if the actuator is bad how ever i do not. Thanks, Justin . sparetimefab Newbie. If it's a '97+, I would try unplugging the column sensor under the dash. I've got a 1992 k1500 with the 5. If I need to change the EVO sensor, I would do this my self, but I want to get rid of the steering issues all together. Then you may have to do some more things to the EVOs valve housing Im not sure, but there is a video on you tube about it. Joined Jan 28, 2019 Messages 3,328 Only some models had EVO. 454ss I'm Awesome. Both of my '97s have the EVO bypassed, one with a '96 pump and pressure line and one with the GM EVO bypass kit on the stock pump. The pump I ordered has the EVO bypass installed, but I don’t see an option for a stock ‘EVO’ type hose. Deleted the EVO from the pump using the Dorman fitting. Before it gets to much colder out I'm going to try and get it flushed and maybe that might make it change. I read in another thread to order a conventional pump and hose from a 96? A little help/opinions on EVO. Personal opinion, I'd delete that POS EVO system. Pre & post EVO pumps are the same. My pump just blew and has the Evo system. " Thank you, internet people. If you don't have a plug it means either the previous owner replaced the pump with a non-EVO one or he bought the GM bypass orifice and removed it. I just put a new line bc the old one was shot. 7L Vortec as the 1996 part didn't have it and I'm not aware of any TBI trucks using the EVO sensor). Because with EVO the connection for that line faces the front of the truck, not the rear like the pic above. IMO, consider yourself lucky that your '96 doesn't have EVO and all the issues that come with it. '97 C1500 Power Steering Parts Selection (EVO Delete) df2x4; Nov 28, 2023; Engine Performance + Maintenance; 2 3. Front suspension on both are bone stock. g. Rev it up and it’s much better. Latest: pops84c10; 8 minutes ago; The Garage. Not a ton, but it is noticeable. Would this be solved by removing the Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. No more twichyness in turns. Nothing like unplugging the EVO and putting the system in You can remove the EVO from the pump but, to use the pump, you have to replace the EVO with a fitting, as shown in the attached document and referred to as "union fitting" (the document is from the GM EVO delete kit # 19168825). Try unplugging it to get the solenoid to disengage. My 3500 has properly functioning EVO and I love it. On top of that, these trucks drive great with it bypassed. Looking from the top, it's possible that it's actually engine oil as my valve covers leak quite a bit, although that still would involve a bit of a jump from the head. Does it wander at low speeds and high speeds as well? Your truck has an EVO valve/sensor. To do that, I had to delete the EVO. GMT400 Contact us; Terms and rules; I think the delete pumps, are EVO with adapters for using the EVO lines. Click to expand Not talking about the pressure sensor. Which is why I said grab the parts out of a junkyard pump. . All I know is that Hydroboost and EVO can work - my 99 C2500 Suburban proves that and, like the OP, I prefer the heavier (but far from outrageously heavy) feel at speed. Bookario11 Newbie. But I thought maybe I got a bad one and tried unplugging it and the compressor still had engagement. GMT400 Forever! Joined Mar 21, 2015 Messages 2,082 Reaction score 3,328 Location Longview, TX. So, in summary, I can easily understand why someone would want EVO. The steering system doesn't have the week tie-rods like the GMT-800's. Forums. I have had my EVO unplugged When my '97 first began do that 'momentarily-on-ice' thing, I just unplugged the EVO sensor on the lower column. IIRC the usual problem is the sensor, which senses steering wheel rotation, fails. Joined Jul 27, 2020 Messages Looks like that circuit is also spliced into the electronic brake control unit and the evo steering module. Once that fitting is in place, a high-pressure line from a non-EVO vehilcle can be used. Reactions: 99CHV2500. Threads 2K An EVO was available on some '97 and later GMT400's power steering pump. Lyonsperf; Nov 2, 2024; Engine Performance + Maintenance; GMT400 Contact us; Terms and rules; GMT400 CK Manual Project The 1988 - 1998 GMT400 Chevy & GMC Pickups Message Board. I removed the EVO and The power steering sprung a big leak and I found that it was the EVO/TFE Actuator that is located at the bottom of the power steering pump. The two functions are still mutually exclusive, just housed in the same module. EVO sensor problem? Hello all, I'll start by saying I'm not sure if this is the right section for this question, so I apologize ahead of time if not. It has the same guts as the older pumps use, more or less. Not at all, I'm replacing one of the EVO delete kits because it appears to be leaking. If you have EVO (which it sounds like you do), it's known for failing with age. I assume some 3/4 and 1 tons came with EVO. 1; 2; Next. If you have a wire As stated, likely the brake transmission shift interlock. 5” more than stock. It had been on the truck for a few thousand miles and 2 days ago it started to act as if there is no power steering at all. The red truck's build date is 1/7/97 and the Suburban is 12/16/96. com Reactions: Orpedcrow, redfishsc and HotWheelsBurban. Personally I would want them out of a GMT400 so that the control valve provides the designed steering effort and feel for the earlier GMT400 truck. ejwz vqzcnp tozcz arrfbs mxjotvtzq hcx qpkn cac fjw scf