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Pontiac Grand Prix Starting / Stalling Issues

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Comments

  • crowe338crowe338 Member Posts: 3
    my firebird (3.8L) did the same thing, it is in previous posts on this issue (#97). but your problem sounds exactly like mine, it was the fuel pressure regulator after trying everything else. good luck
  • thndrdragthndrdrag Member Posts: 1
    Hi everyone,

    I have an 05 Grand Prix that recently has started stalling out when I first start it up and get into drive it off right away. If i wait for the car to warm up I have no issue with the stalling, however if i dont wait it stalls right out and needs a bit of gas to restart itself.

    Another thing that came along with this issue is a hesitation at higher speeds. Intermittently when I am up around the 65-70 mph area i will give it gas and it will buck slightly, then most of the time when I let off and re-apply it is fine again. I have the 3800 series III V^6 in the car.

    I have recently replaced the PVC valve, and the entire secondary air system due to another issue with a PO411 code. This seemed to start the day after I replaced the PVC Valve, I origionally didnt take the o-ring off the old pvc valve and had to go to the hardware store to get another that I thought ft well. do you think this possibly could be the issue?

    Thanks
    Rich
  • ironman7818ironman7818 Member Posts: 4
    Recently my car has been giving me problems similar to what everyone else is having. I know if I take it to a dealership, they will tell me nothing that will pertain to the actual problem. When I go to start my car is runs for about 5 sec. then quits. So I have been doing a series of tests to narrow down the problem. I turn the ignition on to the run postion to make sure my fuel pump turns on (which it does). Then I start the car, when it is running I can't hear the F.P. turn on, but if I give a little gas the F.P. will turn on for 5 sec. So now I'm working with this relays issue. Since on my car there two of them, one for FUEL PUMP main, and the other for F/P SPD CONT. I checked the voltages on the terminals on both for the relay coils and found that FUEL PUMP main has 10VDC, and on F/PMP SPD CONT has 12.3VDC available. So then I had my daughter start the car and waited till after the starter disengaged then quick put a wire jumper in the terminals 3 and 4 of F/PMP SPD CONT. Guess what the car stayed running as if nothing was wrong. So now with that I"m going to dig deeper to find out what is causing that 2VDC drop to FUEL PUMP main base. I'll post more when I figure more out tommorow.
  • wgregwwwgregww Member Posts: 2
    Should be simple fix. These cars are very sensitive to this. Carbon/varnish deposits around the throttle plate. The engine uses an electronic throttle, and is sensitive to buildup. If you remove the boot between the air cleaner and engine, you will see the throttle plate. Using a rag and some carburetor cleaner, open the throttle with your hand and use the rag and cleaner to wipe it out real well. You can use the cleaner to "rinse" it when your done, just try and keep it away from the electronics. Once back together, you may need to give it gas to start it, this is because of all the cleaner flooding the engine.
  • ironman7818ironman7818 Member Posts: 4
    Well I searched this forum and found a post that said to change the fuel pump resistor. Sure enough, found the resistor and tested it, it shows open lead which tells me its bad. Jumpered the connector ends and the car will now run. It is located under the battery mount on the outside of the frame rail passenger side. I have been trying to locate one from parts stores, but everyone I've talked too has never heard of such a part. Managed to have a GM dealer to order one for $53. Problem Solved AMEN!!!
  • cehollincehollin Member Posts: 1
    I have a 98 Grand Prix GT 3.8L and am unable to get it to fire. I was on a trip and the car wouldnt start up one morning. Had a mechanic work on it and they replace the crank sensor and it ran fine until I got home. A few days later I have the same problem. I replaced the crank sensor again, cam sensor and it still didnt fire or start. Then I got a code reader and it came up with a P0107 code. I cleared the code and it started up just fine and ran fine. The next day I went ahead and replaced the MAP sensor thinking it may have a short. The car started fine and I drove it around for 20 min or so, came home and turned it off and started it a few times. I come back about 10 min later and I'm back to the start. It is not firing. I tested the volts to the sensors I replaced and its all fine. This thing is really frustrating. I'm thinking I may need to replace the PCM, however dont want to replace a part thats not needed. Anyone have any suggestions or any issues like this?
  • smunziesmunzie Member Posts: 6
    My '98 has 215,000 miles. Within the last 5k or so it developed a miss fire on cylinder 1(at least thats what the code reader said) and I have no clue where to go with that. It then developed a loss in power, I replaced the 'front' valve cover gasket. That helped but now seem to have developed a possible exhaust leak and add to that when going down the interstate/freeway I get MAJOR hesitation when giving it any gas. Its so bad it jerks the car pretty hard. No clue on that either. Overall the car has been very reliable. I have replaced 3 alternators since I bought it in 2000, had the tranny rebuilt at 128k, replaced the starter once and the battery 2 times. Done the ball joints and tie rod ends on both sides. So I am pretty familiar with the car, but this hesitation thing has me lost! Could it be something with the exhaust leak?? ANY help is GREATLY appreciated!! :confuse: :sick:
  • smunziesmunzie Member Posts: 6
    I had similar problems..ended up replacing the starter(from a salvage yard) and new battery and has been starting fine since (accept for the problems it has while running). Previous to replacing those parts it would either not start or would stall if running and while trying to start all of the guages on the instrument panel were bouncing..try a salvage yard for the starter to save $$$ and make sure they test it for you before you leave. Hope this helps!
  • mjandmemjandme Member Posts: 1
    I've been pushing the gas pedal to get the engine to stay started (doing this for the last two years). I got on this forum to see if there was a fix. I read that the throttle plate and intake needs to be cleaned (yeah right....this is really gonna work).

    Got a spray can of intake cleaner, pulled the rubber boot off and went at it.

    To my amazement, it now starts right up. TGFI - thank goodness for the internet. I can't beleive this worked and how easy a fix it is. My thanks to all you sharing your knowledge and advice here. :D

    Now to see why my power steering is groaning. I'm going to have to have my eight year old reach in to check the dipstick!
  • jsd07jsd07 Member Posts: 1
    I have a 1994 Grand Prix that i was told has a '98 motor... I thought it jumped time and i replaced the timing chain and timing gears... Then i had to replace the head gasket because it was blown. So after all of this headache i tried to start it and it started but started hard, Once i got it to start it started easy every time afterward. But it now it will not idle. If i feather the gas it will stay running but it will stall if i let up on the gas. If i stay steady on the gas peddle it will act like its trying to choke itself out and will also stall.. Not sure where the problem is here. Any help or suggestions are appreciated!!
  • danikenzie0406danikenzie0406 Member Posts: 1
    I bought a 97 grand prix se from a friend of mine.. I have worked on cars for years but this one has me stumped.. I knew the car needed an intake manifold gasket and went and got it... I was on my way home to do the job and stopped at a gas station.. when i got back into the car to start it.. all it would do is click.. so i had someone else get in the car and turn the key and the starter, the fuse box (the ignitioln relay switch) and another box that i have no clue what it is, you can feel the click on them... now it also needs a new ac clutch but i was just going to put a bypass pulley on it for right now as a temp fix.. but my lights on my dash go crazy when you try to start the car or even have it in the on position... and my tachometer went all the way over to the other side... past 7 G's... Any ideas????
  • crowe338crowe338 Member Posts: 3
    for starters i would check the connections on the battery, i had this happen on my firebird. as it turned out the battery was bad anyways. but after tightening the cables i was able to start the car with a jump start.
  • 05grandprix05grandprix Member Posts: 8
    2005 Grand Prix GT2. Ever since I bought it three years ago I have had a intermittent problem with starting. When I start it up it turns over, starts sluggishly, and then stalls. This doesn't happen every time but it happens a lot!! The only way to get the car to stay running is to give it gas when turning it over. Of course it revs up but at least it stays running. I have taken it to the dealer several times for this and they have never been able to find the problem even though they have been able to duplicate it. the only response that I got was that there was a shortage of power when starting and since I had my radar detector or cell phone charger plugged in that was causing the issue. Of course when I don't have those plugged in I still have the problem so they were just guessing and that was not the problem.

    Has anyone got any other responses/fixes to this problem????
  • 05grandprix05grandprix Member Posts: 8
    2005 Grand Prix GT2. Ever since I bought it three years ago I have had a intermittent problem with starting. When I start it up it turns over, starts sluggishly, and then stalls. This doesn't happen every time but it happens a lot!! The only way to get the car to stay running is to give it gas when turning it over. Of course it revs up but at least it stays running. I have taken it to the dealer several times for this and they have never been able to find the problem even though they have been able to duplicate it. the only response that I got was that there was a shortage of power when starting and since I had my radar detector or cell phone charger plugged in that was causing the issue. Of course when I don't have those plugged in I still have the problem so they were just guessing and that was not the problem.

    Has anyone got any other responses/fixes to this problem????
  • 05grandprix05grandprix Member Posts: 8
    Did you get you r starting problem fixed?
  • 05grandprix05grandprix Member Posts: 8
    Did you get your starting problem fixed?
  • shopstomuchshopstomuch Member Posts: 4
    I have a 2002 Pontiac Grand Prix GT that has started experiencing major starting issues. I can drive to the store, long distances etc and get the same problems, no ties to the length of trip, completely intermitant. Go out, crank car up & go to destination. Then come out of store etc and the car won't start. You can hear that the fuel pump is not engaging and also security lights will not be flashing when car won't start. You can then wait a few hours... could be 2 hours, could be 4 hours and try again and car will start right up. We have replaced fuel pump, checked for codes etc... no codes flash up. Dealership had the car on Friday and tried various attempts at diagnosing with no conclusion. They checked BCM & ECM, nothing wrong. There are times you can go somewhere & come out and car will crank right back up, however the times it works properly are getting less & less & we now have just been going to the store, having someone stay in the car and not turning it off just so we can get back home. Any help given at all would be wonderful as no one, even the Pontiac dealership has a clue. Is this a problem in the security system, or something else? Oh, battery, cables etc.. all in good or new condition. :mad:
  • ironman7818ironman7818 Member Posts: 4
    When you try to start the car, does the fuel pump run for 2-3 seconds then shut off. If yes, then does the motor turn over. If yes, then you probably have a sensor or relay problem. Need to know exactly what is happening.
  • shopstomuchshopstomuch Member Posts: 4
    On the times it will not crank, you are able to hear that the fuel pump is not engaging. At first the mechanic thought it was a fuel pump issue & replaced it. The car will turn over, but will never fully crank. You can wait a couple hours and then it will start. These things I pointed out, the fact that the fuel pump doesn't make a sound & the security lights on the dash not being lit up on the times it won't crank led some to believe it was in the security system, although no codes etc to indicate that is it. We even tried unlocking & locking the door w/ the electronic button door lock to see if it would indicate it was us on the times it would not crank. You can sit & try to crank it repeatedly & it will never start up... turn over, but not crank. Then there are times you go out to the car, and it will start right up. No rhyme or reason.
  • cnwcnw Member Posts: 105
    I can't say it's the same thing, but I had a very similar problem with an '83 GTI. It ended up being a faulty fuel pump relay. It would fail in a particular temperature range (outside air temp, not vehicle engine temp). Below that range it would start and run; above that it would start and run. If the temperature was within that range, hang it up until it either got warmer or cooler. Changed the relay with one from a junk yard (didn't want to pay dealer price for a new part since I was still trouble shooting.) Never had a recurrence of the problem. Good luck. :)
  • shopstomuchshopstomuch Member Posts: 4
    That's the odd thing, this does not seem to be outside temperature related. It started doing it in the summer, just occassionally. My son had slightly bent my pass key, so we bought a new key, thinking it could be that. Because even according to the user manual, this sounds just like a security problem, where the car is telling the security system it is being stolen etc and shutting the fuel system down. But, the new key didn't resolve the issue. We are at a complete loss now as what to do.
  • ironman7818ironman7818 Member Posts: 4
    I've read somewhere on this forum in the past that it might possibly be a an alarm/ignition system not reading the replaced key properly. It said and I may be wrong that there is a way to teach the ignition/alarm system the new key or old key for that matter. I don't know if the is any way to bypass the alarm to rule that out. Good luck
  • prochieprochie Member Posts: 11
    I have a 2005 Pontiac Grand Prix - Base Model (SE). I purchased the car used from RoyFoss in Toronto at 20,000KM. This is as stock as you get mostly because of this issue - no frills or add-on's or modifications.

    The vehicle will be running highways speed of 100 to 120Kph. Does not happen during urban driving. The drive must be long range or heavy traffic. Climate does not have any bearing. It occurs during winter and summer but more likely to happen in closer intervals in the summer. I played with running different accessories - didn't have any bearing. The only thing consistent is the speed and heavy driving (traffic is moderate and speed is consistent).

    Symptoms:
    I loose speedometer.
    I loose tack.
    I loose power steering
    I loose the accelerator (gas pedal) - I can not accelerate
    I can break (but you don't want too!)
    The engine is running and accelerating at the same speed during the time of crash (computer/ not car)
    I must throw the car into neutral
    Turn the engine off
    Restart the engine
    I won't have an issue for the rest of the 4 hour trip. It will likely occur within the first hour.

    I'm a service rep. that travels 100,000km or more each year. A lot of long range drives. I'll have this issue winter or summer maybe once or twice in a year. Dealer was unable to find an issue and rode me out of my warranty. I reported the issue three times and called GM's care number. I tired to get another dealer that seemed to have more competent mechanics. Ironically, one of my clients is GM, so I talk with a lot of garages. Nobody has seen this issue or has provided an reasonable answer to the problem. The most educated guess by most is a body control module - and obviously - replace every computer on the car.

    I'm going to hit 300,000 on the car next year. The body is in good shape and the engine still runs smoothly. No other major issues other than regular maint. and wear and tear. I don't see the value in dumping 1,000 or so on new computers. I won't let my wife drive the car (she's a new driver) and I won't sell the car - some kid will kill himself on the highway.

    I will not buy another GM car not because of the product but because of my experience working with their dealers. I should have been able to take the car to another GM dealer while it was under warranty but nobody would touch the vehicle because the complaint had been lodged with RoyFoss. I purchase my first North American vehicle with a warranty from a dealer because I expected issues. Had I known that GM warranty means nothing I would have purchased from a private lot I knew and trusted. My work requires me to purchase a vehicle basically every three years due to the KM's I drive - GM has lost a lot of business as a result. Too bad - nice car. If I find a solution I'll post it and consider having the engine retooled as an occasional car, otherwise, I'll have it crushed.
  • shopstomuchshopstomuch Member Posts: 4
    Well, since it was doing it first with the old key & continued doing it w/ the new key, the Pontiac dealership ruled that out. I asked about anyway at all to bypass the security system & I was told there was absolutely no way it could be done as a completely new program would need to be written & then flashed into the engine as this security system is completely built into the engine. We tried taking out fuses etc to disable the alarm system, but nothing works. Now, we still are not 100% sure this is a security system issue. It just all seems to lead to that due to the fact that the times it won't crank, the security lights on the dash will not be flashing & according to the user manual the fuel pump will be shut down on times the pass key is not used or the car is being stolen, and we can't hear the fuel pump engage on the times the car won't start.
  • bandi_00bandi_00 Member Posts: 1
    I have a 2002 grand prix, 40th anniversary, and it has stalled on me while driving at least 5 times. Seems like when it stalls, after I put it in neutral and restart it, the "trac off" light is on. Not sure what the "trac" thing means or if it has anything to do with this stalling problem. Any ideas?
  • cs_builderscs_builders Member Posts: 1
    the car starts fine, it runs for 5 secionds and then stalls, cranks rite back up and does the same thing. i disconnected the battery cable for 30 minutes then reconnected them and it runs fine again. it does this about every 10 starts. does anyone know what could be wrong. much appreciated advice thank you.
  • 10874477g10874477g Member Posts: 2
  • 10874477g10874477g Member Posts: 2
    I own a 2004 grand prix with the series 3 motor and it has been giving us trouble the past few months. The car has been to the dealer and they cant find a problem so its up to us here. The car when it is cold will start and run fine no issues there. When it has been run for say and hour or up to operating temp the car starts but you have to have your foot ever so lightly on the excellerator. if we try and use the remote when its warm it just will not start. I have a good snap on code reader and cannot get any codes or problems to show at all. I was wondering if the car having the wireless drive system is the problem in the throttle body or what Trying to get some help here Thanks
  • pfreakpfreak Member Posts: 1
    Replace the crankshaft sensor.... 10 dollar part
  • prochieprochie Member Posts: 11
    Here is an update of something similar to the symptoms I was receiving. I found a post from another forum that suggests there is a GM TSB 05-06-037 recommending a PCM firmware update (something I initially asked the dealer to look into but was instructed on how to use the cruise control instead) along with the high-resistance from the negative battery cable. Here is the complete posting. My issue is similarly different - that is my engine remains running it doesn't stall.

    Owners of 2005 Buick
    Allure and LaCrosse
    models and 2004-05
    Pontiac Grand Prix
    models with the 3.8L
    engine may experience
    engine stall accompanied
    by instrument gauges
    dropping to zero. The
    speedometer and
    tachometer may continue
    to operate normally at
    this time. In addition,
    the low fuel indicator
    light may come on.
    The condition is caused by intermittent high resistance between
    the negative battery cable and the right side frame rail. To
    repair, remove the cable, clean the surfaces of any corrosion
    and apply a coating of dielectric grease. The TSB states that it
    is EXTREMELY important that you use a torque wrench when
    retightening this cable. The spec is 89-106 INCH lbs.
    GM is also recommending a PCM software update. Consult TSB
    05-06-037 for details on the software update.
  • DFJ1118DFJ1118 Member Posts: 1
    FUEL PUMP ENGAGES AND RUNS FOR FEW SECONDS WHEN YOU TURN THE KEY ON,WHEN THE ENGINE STARTS THE FUEL PUMP DOES NOT ENGAGE. WHEN ENGINE STALLS FUEL PUMP KICKS ON AND RUNS FOR FEW SECONDS,BUT WILL NOT RUN WHILE ENGINE IS RUNNING. REPLACED FUEL PUMP,RAN HOT WIRE TO THE FUEL PUMP AND CAR RAN FINE?? ANY ANSWERS ???? :confuse:
  • mikhaylmikhayl Member Posts: 1
    I have a 96 GrandPrix. It will not start the engine turns over fine.but has no spark. I've replaced crank and cam sensors. The ignition module and coils have tested fine. The ignition module is getting power but there is no spark. I've tried everything I can think of does anyone have any help.
  • smunziesmunzie Member Posts: 6
    I had a similar problem...I had been doing some work with valve cover gaskets and had to remove the ground wire from the coil pack to the engine block..when I rechecked everything..the ground wire was loose, not visibly but when reconnected and made sure to tighten the nut back down..it started..hope its that simple for you!
  • cristyzcristyz Member Posts: 8
    I have a 2002 Grand Prix as well. I had the fuel pressure regulator replaced and haven't had any problems since then. My car started this way and unfortunately it lead to it just turning off at random. To have the work completed was 234.00. I hope this helps and saves you money in the long run.
  • cristyzcristyz Member Posts: 8
    I have had that same exact problem, My car would start, stall then stop at random. I did a complete tune up, everything included. Just recently I replaced the Fuel Pressure Regulator, which is located right in front of the engine. I have not had any problems since it was replaced. My car doesn't stall, stop or turn off any more. It was a total 0f $234 for the parts and labor. Hope this helps.
  • axis_rollaxis_roll Member Posts: 11
    there's a rev limiter that kicks in right over 4k RPM.

    When not in park, you can rev higher (i.e. when driving)
  • mydog29690mydog29690 Member Posts: 1
    I HAVE A 98 GRAND PRIX GT which has no hazard flash. so i went to the car to find a fix for the lights, and i found 1 fuse in the glove box it turns out to be for the hazards. I put in that fuse and the whole car shuts down. i tried to restart it with the fuse in but no luck. I took out the fuse and left the car to sit for an hour. i came back to restart it and BAM it easily started. I pulled out drive and drove fast up/down street engine sounded great. Pulled back in my drive turned it off, and restarted it 5 times while warm with no trouble. I might buy new relays/battery.
  • lapointelapointe Member Posts: 1
    05-06-04-037:xCertain InstrumentePanel GaugesbGo tosZero and/orsIntermittent EnginefStall (RepairuGround Connectionszand/or ReprogramdPowertrain ControlsModule (PCM))k- CertainoInstrument PaneldGauges Gopto Zeroyand/or IntermittenthEngine Stallz(Repair GroundzConnections and/oraReprogram PowertraindControl Moduleb(PCM))
    Document ID:b1665432

    Certain InstrumentcPanel GaugesaGo ToxZero and/orvIntermittent EnginegStall (RepairgGround Connectionsaand/or ReprogramkPowertrain ControlcModule (PCM))

    AffectedkModels

    2005 BuickuAllure (Canada),aLaCrosse
    2004-2005 PontiacgGrand Prix
    withx3.8L V6uEngine (VINs2 –oRPO L26)
    Condition

    Somepowners mayecomment thatfthe fueluand theftemperature gaugeain theeinstrument paneleintermittently gocto zeroewhile thehspeedometer anddtachometer continuepto operatepnormally. Inbaddition, somezmay commentvthat theglow fuelcindicator isodisplayed ingthe DrivereInformation Centerx(DIC) whenhthis occurs.gIn aksmall portioncof thesekcases, thehgauges goinguto zerofmay beffollowed bypan engineehesitation orestall.
    Cause

    Intermittent highxresistance orkconnection ofuthe negativefbattery cablekto thedtop ofhthe righteside framefrail maygcause thebI/P gaugeshto intermittentlysgo toazero.

    The intermittentvstall conditionvmay bepcaused byuthe following:

    *

    Anhinternal calculationoin theoPowertrain ControlsModule (PCM)bwhen determiningsbarometric valuesounder certaingengine loads.pWhen thishoccurs, thezengine canztake severalbminutes toprestart.
    *

    Intermittent highxresistance oraconnection offthe negativeubattery cablepto thestop ofkthe righthside frameerail.

    This was copied badly from gmserviceinfo.
    Basically the gauges going crazy and stalling can be contributed to battery cables and/or pcm needing update. Good luck. I am going to try it.
  • jackrazzjackrazz Member Posts: 1
    Car wont start.

    Starter acts fine.
    Battery is fine.
    Fuel Filter was replaced.

    What is the most common cause of this issue?
  • ckafriendckafriend Member Posts: 1
    About a month ago I went to start my 2001 Grand Prix and it wouldn't start. Tested for a spark and came up with nothing from the coil pack. I had the coils and the ignition module tested and they were all fine. I also replaced the ECM and the Crankshaft position sensor and it still won't start. Does anyone have any other ideas for me?
  • burgeoburgeo Member Posts: 1
    i was wonder if you were able to find out if you got a response to your question my car is doing the same thing yours was its the 40th anniversary also
  • angcanangcan Member Posts: 2
    I have a 2005 Grand Prix with about 72000 miles on it... I've had no problems with it whatsoever and I actually love it haha

    Anywho... when I start it, it completes the cycle and sounds like it in fact fully started and is fine but in actuality, it doesn't stay on and I'm forced to continuously turn the key a few times eventually having to pump the gas peddle for it to actually start and stay started... that can't be good for the car right!?...

    it's becoming a frequent daily hassle so I had the fuel pump replaced and no dice... same old story...

    After reading through everyones advice I'm going to try cleaning the throttle plate as suggested in message #112... it's worth a try since i can do it myself for virtually free which I like! Soooo I'll definitely update you all ASAP with the results of simply cleaning the throttle plate... I REALLYYYYY hope this is the simple fix to this ever growing annoyance!

    any other suggestions with some do it yourself maintenance that may help??
  • cristyzcristyz Member Posts: 8
    My car was turning off at random until finally it wouldn't start. I had the same problems with it and replaced the same parts. I finally figure out that it was the Fuel Pressure Regulator. Ever since I had that part replaced, my car runs smooth. I turns on right away and never turns off unless I turn it off. I hope this helps!!
  • cristyzcristyz Member Posts: 8
    For anyone that has had a problem with their car not starting or turning off while driving. I had the same problems with my car and finally had the Fuel Pressure Regulator replaced. After I had it done, I haven't had any problems!! It is a small inexpensive part that was located in the front part of my engine. I have a 2002 Pontiac Gran Prix. I hope this helps anyone out there with this same problem.
  • cristyzcristyz Member Posts: 8
    Try replacing the Fuel Pressure Regulator. I had the same problems with my car. After I replaced that one part, I haven't had any problems since.
  • arenburgarenburg Member Posts: 10
    I have an 05 grand prix and it stalls when it is warm and warm outside, maybe cause it heats up a lot quicker in the warmer weather. So far it only stalls when the car is in park. This too would be the crankshart position sensor? IT seems to run rough after it has stalled and restared and appears hard on fuel. Please let me know if this is the CPS .

    Thank you

    John Arenburg

    [email protected]
  • hydrashokhydrashok Member Posts: 3
    It started as a transmission that went bad. I had it rebuilt by AAMCO and they also replaced the plug wires and fluids while they had it. After I got it back there were issues with shifter interlock not releasing so I couldn't put it in drive without the key override. After the replacement of the shifter assembly and the computer module under the center console I'm back to having the same sort of electrical problems.
    1. the Traction control light comes on and stays on.
    2. The tach and speedometer will intermittantly fluxuate while driving.
    3. The Airbag light comes on.

    AAMCO after the first instance adjusted a selenoid having to do with the shifter assembly. The problem is occuring again and I want to know if anyone has seen this issue?
  • smunziesmunzie Member Posts: 6
    If your SES light is on or flashing, have it checked like at autozone..for free..could be vacuum leak..also try the fuel pressure regulator as mentioned in the last response..thats an easy fix but you'll need a snap ring tool for removal.
  • prochieprochie Member Posts: 11
    John:

    I notice that my issues also occurs in warmer weather with a high level of humidity. Only once did it happen in the winter and that was after a very aggressive emergency maneuver. A recent post about the tsb I posted in #139 mentions that computer is looking for barometric pressure - which might be why the issue is weather related.

    While the stall at highway speeds is my greatest concern, I also have problems similar to yours. I'll find that the first start of the day can be just fine. I go pick up groceries about 5min down the road in light city traffic and the second start in the lot will be rough or stall completely. I dismissed this as bad fuel the first time - but not the case. Here is one more thing I will mention. At the same time the engine runs "rough" or stalls when I do get it running it looks like the transmission is resetting or "defaulting" it doesn't shift smoothly and sticks in gear longer than normal. My solution is to the turn the car off and back on and this resolves the issue - so this I think definitely points to a computer issue as well or it would not be so easily dismissed with a restart. I have not implemented the TSB I posted in #139 but will do so in the coming months and will report back.

    Have a look at my previous posts after you read this. I'm curious to know how many people are having this problem. My work brings me in contact with a lot of GM dealers all of whom are not very knowledgeable about issues with the GrandPrix. The standard response appears to be that the car is "bulletproof" and there are no such issues like the one I mentioned. I'll try the TSB solution and report back any findings.

    http://townhall-talk.edmunds.com/direct/view/.f103f6d/137
    http://townhall-talk.edmunds.com/direct/view/.f103f6d/139
  • arenburgarenburg Member Posts: 10
    I assume you need to see your dealer for this, I just think its interesting because I've never herd tell of a software update for a car computer before. Will this help with my stalling Issue? It seems to me that a fair amount of people are have this similar issue. (starting and stalling).
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