Spoon Posted October 24, 2005 Report Posted October 24, 2005 I've got a 3.4l grandprix that keeps stalling on me. It stalls about every 30kms in town/doesn't seem to do it on the highway. Runs good, but I will just be driving along and notice the check engine and check gauges light come on, it doesn't set any code and will restart right away. does any one have any ideas?
chadz34 Posted October 24, 2005 Report Posted October 24, 2005 I'll tell you right now the motor is fine. I don't know much about the electrical shit, but I know the engine is fine. Although pinpointing electrical problems is a kick right in the CACK!
joey b Posted October 25, 2005 Report Posted October 25, 2005 what year? 91-93 had problems with injectors causing it to stall
Aaron Posted October 25, 2005 Report Posted October 25, 2005 what year? 91-93 had problems with injectors causing it to stall Exactly. The 91-93 had problems with the injector pulse at idle. If you buy all new injectors, or upgrade to one's from a later year, it should fix it. Mine had this problem and I put in injectors from a 1996-97 3.4, and to my knowledge it hasn't stalled since. So your remedy is: Buy new injectors Buy used 1994-1997 3.4 DOHC injectors (I'd suggest this route, they will still flow good, and will be A LOT cheaper. But once installing them run a bottle of expensive injector cleaner, expensive as in NOT the cheap brand that you've never heard of before, so figure about $10).
Spoon Posted October 26, 2005 Author Report Posted October 26, 2005 what year? 91-93 had problems with injectors causing it to stall Exactly. The 91-93 had problems with the injector pulse at idle. If you buy all new injectors, or upgrade to one's from a later year, it should fix it. Mine had this problem and I put in injectors from a 1996-97 3.4, and to my knowledge it hasn't stalled since. So your remedy is: Buy new injectors Buy used 1994-1997 3.4 DOHC injectors (I'd suggest this route, they will still flow good, and will be A LOT cheaper. But once installing them run a bottle of expensive injector cleaner, expensive as in NOT the cheap brand that you've never heard of before, so figure about $10). Ya as a matter of fact its a '92. I thought I seen a bulletin somewhere about something like that. I thought it was more for parking lot manuvors? I noticed that it doesn't stall on the highway at all, but as soon as you get to the first stop light it does. Also if your driving 40-60kms/hr and let off the gas the rpms will drop approx 900rpm, then jump back up, it will do this about 3 times until it stablizes its self.
GP1138 Posted October 26, 2005 Report Posted October 26, 2005 Also, you might consider cleaning/checking the Idle Air Control valve as well.
92Typhoon Posted October 26, 2005 Report Posted October 26, 2005 I've got a 3.4l grandprix that keeps stalling on me. It stalls about every30kms in town/doesn't seem to do it on the highway. Runs good, but I will just be driving along and notice the check engine and check gauges light come on, it doesn't set any code and will restart right away. does any one have any ideas? Hmm.... Sounds like my '93 Z34. I was hoping to avoid injectors but if it fixes the problem, I'll start looking for some used ones. I was thinking it was the ICM because of the high mileage of my Z. Sounds like I better start saving for a good tune up for the Z.
Aaron Posted October 26, 2005 Report Posted October 26, 2005 Also, you might consider cleaning/checking the Idle Air Control valve as well. That will help, as will redoing all the vacuum lines, but doing the fuel injectors will solve the problem. By doing all the vac lines and the IAC mine stopped stalling, but the RPMs were still very unstable and fell low when slowing down, close to stalling, but not quite.
Spoon Posted October 27, 2005 Author Report Posted October 27, 2005 Also, you might consider cleaning/checking the Idle Air Control valve as well. That will help, as will redoing all the vacuum lines, but doing the fuel injectors will solve the problem. By doing all the vac lines and the IAC mine stopped stalling, but the RPMs were still very unstable and fell low when slowing down, close to stalling, but not quite. Did the injectors stablize the problem?
Aaron Posted October 27, 2005 Report Posted October 27, 2005 Mine had this problem and I put in injectors from a 1996-97 3.4, and to my knowledge it hasn't stalled since.
skiiirt Posted October 27, 2005 Report Posted October 27, 2005 Perhaps you should also check your fuel pressure to make sure your pump is doing its job
Aaron Posted October 27, 2005 Report Posted October 27, 2005 Perhaps you should also check your fuel pressure to make sure your pump is doing its job I highly doubt that's it, that would affect the car at every RPM, including WOT.
skiiirt Posted October 27, 2005 Report Posted October 27, 2005 My FPR (fuel pressure regulator) was on the fritz and it did exactly what Spoon says is happening to his vehicle. It would be fine on the highway, as soon as I would be off the gas at lights it would die on me. It was holding pressure just not enough. Injectors are always a concern but most people have already had their injectors swapped as per GM Recall. I would do as you said and check the injectors, but dont be surprised if 3 hours after doing all the work the problem comes back. Not everything is as easy as that.
Spoon Posted October 30, 2005 Author Report Posted October 30, 2005 I had a shop just install a new fuel pump and fuel filter. I checked the fuel pressure after this was done. It's about 45psi primed and drops to about 40 psi running. On my pressure gauge it has a relief valve, at times if I hold the relief vave open while the cars running it will imediately stall, at other times it will stay running. Is this suppose to happen? I also just installed a new IAC and releaned it. Today I cleaned the throttle body and injectors, problem is still there. Is the fuel pressure reg. under the plenum? I also tried a new EGR, problem is still there. All the vac. lines have been redone. Can a EGR cause the idle to rev. up and down eratically? Does anyone have any other ideas?
Aaron Posted October 30, 2005 Report Posted October 30, 2005 Edited, he updated the injectors and it didn't help unfortunately.
White93z34 Posted October 30, 2005 Report Posted October 30, 2005 you may want to try a ICM, that will cause that issue if its on its way out. as for the 91-93 injectors to my knowledge mine are 137,000 old and once in great while will my car will stall while sitting at a redlight, hapiened MABIE 10 times in 2 years.
Spoon Posted October 31, 2005 Author Report Posted October 31, 2005 I had a shop just install a new fuel pump and fuel filter. I checked the fuel pressure after this was done. It's about 45psi primed and drops to about 40 psi running. On my pressure gauge it has a relief valve, at times if I hold the relief vave open while the cars running it will imediately stall, at other times it will stay running. Is this suppose to happen? I also just installed a new IAC and releaned it. Today I cleaned the throttle body and injectors, problem is still there. Is the fuel pressure reg. under the plenum? I also tried a new EGR, problem is still there. All the vac. lines have been redone. Can a EGR cause the idle to rev. up and down eratically?Does anyone have any other ideas? Yah, I have an idea. LEARN TO FUCKING READ. I told you what it was, with near 100% certainty, and you didn't even try it. I've been doing this for like 6 years now, I know what it is. And it isn't liek I just told you once, I told you 3 times in this thread alone! So keep spending money on the mechanics and shit, or take my advice, go to a junkyard, spend $15 for a set of injectors, and your problem will be gone. This pisses me off, when I spend my time giving my educated advicec, and you won't even take it. Sorry eyem sofa king we tod did. I fogot to mention in my last post that I already upgraded my injectors, no change (surprize!) I took it for a good bag today and now it set a code 32 EGR, could this cause a problem like that?
Aaron Posted October 31, 2005 Report Posted October 31, 2005 Sorry about coming off harsh, I have since edited that. I'm surprised the injectors didn't fix it. However, the EGR can also cause the problems you mentioned, along with a rich exhaust smell. I would definately focus on this since it threw a code. You can take it off and clean it thoroughly, or replace it (expensive). I know mine was bad when I got my Z34, but I dealt with it and then totally removed it when I added headers.
Spoon Posted November 1, 2005 Author Report Posted November 1, 2005 ICM, EGR, PROM, and a PCM are all new aswell. Just did a complete tune up. Tonight I lifted the car on jack stands and duplicated the concerns as if it were on the highway. I could get it to act up, but could not get the code to set again. I tried several times for several hours. Also sometimes if I just let it sit and idle the rpms would jump around. I noticed that if I kept the speed at say 40kms and slammed on the brakes the engine would stall. I'm running out of ideas, what next?
Spoon Posted November 2, 2005 Author Report Posted November 2, 2005 I hooked up the scanner today and found that it was a code 33 Map sensor code not the egr, I guess I don't know how to count. Could this cause a stalling/erratic idle?
Bake82 Posted November 2, 2005 Report Posted November 2, 2005 Definetly would! It certainly made my car run like crap. Although mine is a 2.8 it made it stall and do what your's is doing.
Spoon Posted November 4, 2005 Author Report Posted November 4, 2005 Today I tried a new Map sensor/still has the same problem. I did notice 1 really weird thing, It only stalls when the cars moving. I could drive about 2 - 5km/hr and the idle would jump around/even stall, but as soon as the car was stopped the idle would go steady right away. I used the e-brake to stop making sure I didn't use up vaccum from the booster. I tried it in drive and coasting in neutral, same thing, when stopped idle instantly steadied. Could a torque convertor do this? :?
Spoon Posted November 6, 2005 Author Report Posted November 6, 2005 Are the upper and lower intake gaskets reusable? If they are may I should try resealing my intakes again. Does anyone have any other ideas?
Aaron Posted November 6, 2005 Report Posted November 6, 2005 Are the upper and lower intake gaskets reusable? If they are may I should try resealing my intakes again. Does anyone have any other ideas? No they are not.
Farqineh Posted November 6, 2005 Report Posted November 6, 2005 Y'know, I was reading this........I was thinking of asking you if it was and automatic. Does it shudder a bit when it stalls. I mean, does it just die as if someone reached over and turned the key off, or does it seem to be laboured a bit? Someone on this board knows about this phenomenon. I was reading about it somewhere just recently...try a quick search. Obviously isn't Aaron... Torque converter lockup solenoid.....A friend of mine had a Cavalier that did the same thing, Different power train of course....however similar design. Maybe have a look into it and see. I'm not for sure on it but it's a good guess. Stupid little solenoid was all it was. I wish you luck... Let us know how it turs out....I'm curious bout this one!!
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