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Pontiac Bonneville Starting/Stallling/Ignition Problems

162 messages,  Last post on Nov 16, 2009 at 6:09 PM

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#139 of 162 Re: 3800 V6 intermittent starting problems [neustkg] by kish81 Mar 28, 2009 (6:11 am)
Replying to: neustkg (Feb 02, 2008 10:58 am) I have a 98 Pontiac grand Prix GTP. It has been giving me trouble off and on for years. It runs fine in cold weather. As soon as it starts getting into warmer weather It starts with it shutting off while driving and will not start on hot days with out several try's. I have it narrowed down to the PCM. But it is related to battery voltage. As the PCM's age their capacitors go bad. These help maintain the computers voltage while the car is running. If your cars voltage drops below 10 volts and your capacitors can't cover this voltage drop the PCM will reboot. This shuts down your ignition system until the PCM reboots and sees good voltage again. This power drop may be quick, like when your AC kicks on or anything that turns on or off that causes a voltage change. If the Caps are good in the PCM your computer will never see this drop. That is why a new battery will help. Also cleaning your battery terminals and charging your battery will help with this. Batteries also hold a charge better in cold temps. Bad news is it will only keep getting worse as the capacitors keep degrading. I am about to the point of buying a new PCM if anyone knows where I can get a new one for a good price let me know please. Replies to this message: imidazol97 (Mar 28, 2009 6:36 am)
#140 of 162 Re: 3800 V6 intermittent starting problems [kish81] by imidazol97 Mar 28, 2009 (6:36 am)
Replying to: kish81 (Mar 28, 2009 6:11 am) Check Autozone and Advance auto parts for PCMs. Someone replaced one in an H-body solving dying problems and high idle at times for $89. They had thrown lots of other parts at the car for $hundreds$ before doing the PCM.   The battery voltage cna be affected by the connections at the battery. If you have multiple connectors on top of each other at the positive, pull back the plastic and check for corrosion between them.
#141 of 162 Re: 2002 bonneville se start/flooding [aughen] by imidazol97 Mar 28, 2009 (6:46 am)
Replying to: aughen (Mar 16, 2009 10:51 am) Do you believe it has a good spark? You imply that it's firing but is flooded so coughs instead of starting normally. When it won't start use an extra spark plug and connect one of the wires to it and have someone crank. You should get a great blue spark with the plug lying on a grounded part of the motor. Could be the ignition spark control udner the coils. You might check the connector on the front of the ISC under the coils for corrosion. Remove, clean, reseat.   The FPR also can go bad. The fuel pressure regulator may fail and have fuel in the vacuum line. Pull it off and see if it has fuel in it when this happens. It on the front of the motor next to the UIM.   But mostly I would want your fuel pump thoroughly checked for correct pressures, fuel flow volume, and the electrical current draw--bad pumps tend to draw more current.   I'm betting on low fuel pressure from the pump causing poor injector spray and no start but flooding.   BTW, did you know that if you hold the accelerator to the floor while cranking, it turns OFF the fuel injectors and you can clear a flooded engine? It's just like holding the throttle open in the days of carburetors and that moved a link that turned off the choke plate so the engine could be cleared of excess fuel.
#142 of 162 stupid car! stalling/ not starting by ginlynn43 Apr 17, 2009 (6:22 am)
1995 bonneville SE 3800 i was driving to work on day and after about 25 minutes of driving i stopped at a stop sign and my car stalled. it started right back up then stalled right back out. then it wouldnt start at all. it turned over like it was gonna start every time but just wouldnt start. finally after about 5 or 10 minutes it started right up and i made it to work no problem. after work i was driving home and about 10 minutes of driving my car stalled while i was driving. i coasted into a parking lot. it wouldnt start and wouldnt start. just turned over. finally 10 minutes later it started right up. i drove it to my mechanic and dropped it off because i have been going through this for well over a year and no one knows y it does this. i have had to leave this car at work on a few occassions because it just wasnt gonna start after trying for over an hour. i would return the next day and it would start right up. it always turns over though. it does it more often in the cold, rain, and winter. not so much in the summer although it DOES still do it in the summer. just not as often. i am clueless. i took it to the dealer and they have nothing. they came up with a bad intake that would flood the engine causing it not to start and to stall.i had the intake replaced but still having the same problem. my mechanic couldnt do anything because of course it ran great for him the whole week i lift it with him. HEEEELP!!!!!!!!!.i'm going to check the buss bar under the driver side carpet and clean it. my power locks stopped working a few years ago. my car has this feature that after u turn off the key the radio and windows will still work until u open the doors but that stopped working. now everything cuts off when i turn the key off. and now my damn trunk button dont work! i dont know what to do...!!!!! help!!!!! please! i will pay anyone to make my car work right! i need help! i have a 7 month old son and i cant afford this and i cant keep getting stranded. luckily i havent gotten stranded with him in the car.. Replies to this message: imidazol97 (Apr 24, 2009 5:26 am)
#143 of 162 2000 bonne se 3.8 stalling issue by hoeman Apr 21, 2009 (9:23 am)
after reading some of these post I see Im in for alot of grief my bonne just started this stalling thing and it sounds like there is no clear ans , since this began I have changed the crank senser but still stalles and of couarse it wont do it when at the dealership much to my surprise they are almost as pissed as me, there are going to put a blck box in it so that when this happens again there should be something to go on. Short history car starts fine runs good for twenty min then cuts out can re start osmetimes in nutral but sometimes have to stop once would not start had it towed to shop ,of course it stated right up!!!! but it seem s to happen only when it is warmer outside go figure going to ask theme about draining the tank as one guy said. will post results. AS THE BONNE TURNS Replies to this message: ginlynn43 (Apr 24, 2009 4:48 am)
#144 of 162 Re: 2000 bonne se 3.8 stalling issue [hoeman] by ginlynn43 Apr 24, 2009 (4:48 am)
Replying to: hoeman (Apr 21, 2009 9:23 am) oh yes pleeeease keep my updated on anything u find out! im losing my mind!
#145 of 162 Re: stupid car! stalling/ not starting [ginlynn43] by imidazol97 Apr 24, 2009 (5:26 am)
Replying to: ginlynn43 (Apr 17, 2009 6:22 am) 1994 and 1995 have more failures of the PCM, the computer. I don't know if your body control functions like the retained power is a part of that or a separate module. With odd stalling a crankshaft position sensor might be the problem but I've read many who spent the $100 for a replacement computer from Advance Auto or similar and solved their problems.   My second thought would be the Mass Air Flow sensor. They can be cleaned with a sensor cleaner from the parts store. Do not touch the two tiny wires but you might use an artist brush. If you look at them toward a light you might see dirt caught on them. If you have someone who can substitute a MAF from a working car that would be good--many of the cars with3800s use the same part number. If you buy a replacement, stick with a known good brand.   The fuel pump could also be the problem. When they get hot, the pressure they supply is a little low and that causes problems because the injectors don't work right. But replacing that is a serious repair by dropping the fuel tank. The pressure can be measured by driving with a fuel pressure gauge connected and seeing if it acts up when the car gives problems. Driving a car when low on fuel often helps wear the pumps down because they run hot. If that's happened to this car often running below a quarter tank, it might be a problem.   You didn't mention the number of miles on the Bonneville.
#146 of 162 99 Bonneville cold start probs by danel2 Apr 25, 2009 (12:54 pm)
(Starting car after setting for peroid of time). car will crank but not fire, touch the gas pedal just slightly and will start and not have any probs the rest of the time driving during usage of the start for the day or trip. The next day it will be the same thing. Is the throtle possition sensor bad, or the shaft worn on the buttefly on the throllle body, or maybe leak down of fuel overnite? I set the idle up a shade and of course a fast idle code comes up. So I set it back to its normal position. Any Ideas?
#147 of 162 2000 bonne se 3.8 stalling issue by hoeman May 01, 2009 (5:37 am)
OK got the bonne fixed it was the fuel pump ah but not the pump itself!!! there are some kind of power source leeds that go to the pump and mine where corroded just enough that where they got hot they could not hold the currant changed those and it runs okay hope this helps Replies to this message: imidazol97 (May 01, 2009 6:00 am) hoeman (May 05, 2009 4:55 am)
#148 of 162 Re: 2000 bonne se 3.8 stalling issue [hoeman] by imidazol97 May 01, 2009 (6:00 am)
Replying to: hoeman (May 01, 2009 5:37 am) Were those leads inside the tank or outside?   Did the data box they connected catch the failure?   Glad you found the problem. Replies to this message: hoeman (May 05, 2009 4:55 am)

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