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Sedans Pontiac Bonneville Pontiac Bonneville Starting/Stallling/Ignition Problems
162 messages, Last post on Nov 16, 2009 at 6:09 PM
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I've got the same problem as hoeman, at stoplights and stop signs it stalls, and shuts off at lower RPMs, but the car restarts easily.also sometimes normal start up is tricky because the engine will not fire up right away, you gotta give it some gas to get it going. list of new parts includes: - mass air flow replaced - aftermarket not from GM - crank sensor - ignition module - IAC valve - fuel filter even with these parts installed the problem is still not fixed and even a pontiac dealer looked at it and could not fix my problem. if anyone knows how to correct this problem please help me out
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Replying to: gdirisio (May 02, 2009 4:04 pm) Actually another possibility is the EGR. Disconnect it when it's doing it and see if it starts quicker and drives without stalling. I've read about them sticking open. Try a MAF from another 3800 with the same part number that is GM. You might try pulling spark plug wire in advance so it's easily done. Then when it stalls and typically won't start right away. pull the wire, stick in a screwdriver or old spark plug, lay it on engine ground and crank to check for spark. Also take off an injector lead. Stick in a 197 running light bulb with the two wire leads bent straight to stick in. When the injector's firing okay that bulb should blink during cranking. A distant possibility would be a vacuum leak on a tube or the UIM. Missed another one, FPR. Pull the vacuum hose and look for gasoline liquid. Several of those had leaked. |
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Replying to: imidazol97 (May 01, 2009 6:00 am) |
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My son's car has been well maintained. He bought the car used and was told about the problem. Previous owner replaced the crankshaft censor. Problem remains. Driving down the freeway the car sometimes dies. Car dies in city traffic. Sometimes it starts right up, other times it takes up to an hour or more. He has spent an hour trying to start the car only to leave, come back in an hour, and like magic it starts right up. Twice it started up after pushing it a short distance (coincidence?). Sometimes the car won't start, it turns over, just won't start. Yesterday, I drove his car for 10 minutes, made a quick stop....wouldn't start. When it finally started, it was fine the rest of the day. This morning it stalled on the freeway going 65 miles an hour, which is norm for it's stalling pattern. Both of the above happen whether the gas tank is 1/2 full or topped off. GM says they have never heard of this problem. The computer has no errors recorded. Last August, we went from the Bay Area to Reno and back, NOT a single problem. My son cash supply is limited....Any ideas as to the problem? Starting with the cheapest please. Thank-you so much for any replys.
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Replying to: checkingitout (May 27, 2009 5:44 pm) I did read about someone else with a problem in the age Bonneville. But first be aware that 94 and 95 H-bodies have a higher than usual failure rate of computers with odd symptoms from that. It might be wise to check into replacing the computer itself with an aftermarket rebuild or replacement. I don't believe they are that expensive. But I just read the other day about someone who bumped their cable to the computer while trying to move and jiggle things at sensors looking for just your kind of problem. I assume the computer is under the air intake box like my 98... Anyhow when he bumped the bundle the car stalled immediately. And it was repeatable. I believe he found one particular female connector that was loose and could move away from contacting the plug prong. |
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My 96 Bonneville is having problems with the security light staying on. My wife read online it's due to bad wiring near the ignition cylinder that causes the car not to reconize the coded key. I found a way to bypass this on another forum but since I'm not very good with electronics I bought the modual prebuilt on a site. All i neeed to do was find the connecter under the dash near the steering colum and plug it. Only problem is I can't find the connector under the dash to bypass the security system. The intructions and other people I've talked to say it should be right in front of me when I take off the kick pannel under the steering colum. I don't want to mess around to much looking for it and accidently pull a wire out by mistake. Does anyone have any thoughs on where to look? Thanks
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| i have an '01 bonnie that ran out of gas, i re fueled to 1/4 tank, and now i have no spark. replaced the pcm and still no spark. I was told that the cam/crankshaft position sensors were good. the ignition control module under the coils passed the test OK. I'm now at a loss as to where to look next. there were no problems prior to running out of gas. power everything still works. Battery is good w/ good connections and ground. any suggestions??? | |
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Replying to: winter_eric (Jun 28, 2009 3:58 pm) How does the car run? If the car starts, you do not have a VATS problem. Since you didn't say anything about the car not cranking, I assume it runs okay. The VATS system prevents the car from cranking and the injectors from injecting fuel. It turns the security light on flashing for 3 minutes, then it's ready to read the resistance from the key chip again for the driver to try to start once more. But until then no cranking. If your car has a theft & tampering system, that may be your problem. I have not had experience with the _security_ system portion of that light which involves theft prevention of the car by checking doors, trunk, etc. I have seen a few posts where prople suggest disconnecting the wire to the sensor on the trunk latch. They claim it fails and causes a security llight for the car theft/tampering portion. |
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i have a 1994 bonneville 3800 engine it will start and then shut down after running about 5 seconds ,ive changed the computer and chip key too match and also the ignition moduale,(and they all came from a running 1994 bonneville with a 3800 engine) checked all the fuses and relays,i and its getting fuel im at my whits end!!! cant get no help form the dealerships all they want is money and no advice i just dont know what too check next!! |
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1988 Bonneville LE set up for a year or two with occasional start and drive brought car ran good for two days started sputtering, fluttering and jerking Changed plugs (split fires pre gap) and wires air filter OK, replaced brittle vac line car ran good next day sputtering Changed fuel filter let idle for 20 or so minutes to check for leaks cut it off, re started, drove around block, put it in reverse to park, it cut off crank but no start Let engine cool, re checked my work, plugs/wires tight, filter (correct flow to engine) force idle until it held, cat converter got glowing hot pulled ECM code 44, O2 sensor/rich detected crank no start replaced plugs with AC/Delco standard w/spec. gap of 0.60 crank, start but stall unless I force idle (smell gas but no leaks) pull pcv check for rattle, clean and put back pull O2 sensor clean off, put back pull EGR clean out, wire brush off put back disconnected neg terminal reset and repulled codes just a 12, diagnostic mode crank start and will hold idle after "babying" gas pedal (tach at 1200) cat converter no glow (smell gas but no leaks) put in drive, reverse will stall out unless I brake, accelerate, and put in gear still stall when I try to drive. would like to idle up to get to shop to real mechanic but cant find Idle adj screw. Haynes manual shows nothing but says I have 1989 - 1991 3800 eng. |
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