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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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#157 of 162 1994 bonneville shuts down by denny115 Aug 04, 2009 (6:51 pm)
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!!
#158 of 162 stumped, by crossquills Aug 28, 2009 (3:21 pm)
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.
#159 of 162 Starting Problems/Engine Stops Running at Idle by pgfalcon Nov 14, 2009 (9:40 pm)
I have replaced the spark plugs, wires, new air filter, new fuel filter checked all of the fuses, changed the oil in this car. Sometimes when I start it takes several seconds for the engine to turn over and start the car. When I apply the accelerator it fires right up. I have also been using high octane fuel and a fuel additive. I have also used Lucas Injector Cleaner. The vehicle does get better fuel mileage even gotten 450 for an 18 gallon tank half highway.   Also the engine will sometimes stop running if left to idle for about 10 minutes. Once while the hood was open I noticed a slight puff of air/steam come near the water pump and intake. Any suggestions?   PGFALCON Replies to this message: imidazol97 (Nov 15, 2009 3:57 am) pgfalcon (Nov 16, 2009 4:51 pm) imidazol97 (Nov 16, 2009 6:09 pm)
#160 of 162 Re: Starting Problems/Engine Stops Running at Idle [pgfalcon] by imidazol97 Nov 15, 2009 (3:57 am)
Replying to: pgfalcon (Nov 14, 2009 9:40 pm) What kind of car do you have? Year? Mileage? Background? Replies to this message: pgfalcon (Nov 16, 2009 4:51 pm)
#161 of 162 Re: Starting Problems/Engine Stops Running at Idle [imidazol97] by pgfalcon Nov 16, 2009 (4:51 pm)
Replying to: imidazol97 (Nov 15, 2009 3:57 am) I have a 2003 Pontiac Boneville SE. It has 128,000 miles on it. I am the third owner. The first was an older military vet who had if for nearly fvie years, then another older gentleman bought it and had it for six months and now I have it. My car is super clean and very well taken care of. I have reciepts for regular routine maintenace. Only leakage I have is a small on the head with minimal oil residue. This vehicle has only highway mileage as well. What else do you need to know?
#162 of 162 Re: Starting Problems/Engine Stops Running at Idle [pgfalcon] by imidazol97 Nov 16, 2009 (6:09 pm)
Replying to: pgfalcon (Nov 14, 2009 9:40 pm) Did you start the car without touching the accelerator? That's the way it should start best.   Try turning the key to ON for 3 seconds, then OFF and back to ON. Repeat for 3 times total. Then turn the key to START. If the car seems to start faster, it may be losing pressure in the fuel line, usually a fuel pump problem.   If the plugs and wires aren't OEM iridium for plugs and OEM equivalent for the wires, I'd work on those.   The stalling could be a fuel pump.   I recommend NOT using premium fuel. The car was designed to run on 87. The higher octane leaves more crud in the combustion chamber because it's burning more slowly.   Find the fuel pressure regulator (on the metal fuel line on motor with a small vacuum hose to it) and remove the vacuum hose a look for fuel. If you get a strong smell of fuel it may mean the FPR is leaking.   You may need to have your MAF cleaned. The two fine wires pick up dust from the air. They sell sprays for MAF and air intake cleaning at the auto stores.   I'd save the money for the high octane and use regular, and the Lucas additive and just use an additive occasionally like every 10,000 miles at most.   Watch for seeps at the water pump and the connectors from intake manifold to bracket for tensioner. The o-rings can leak after aging.   Watch the level of coolant inside the radiator; dont' just check the reservoir. Sometimes a leak won't suck the coolant out of reservoir but will take in air causing the radiator to drop.   Check transmission drain and filter change. Should be 40K miles or so, but the manual says at 100K miles.   check the coolant quality. It should be changed every two years by draining and refilling with fresh coolant.   What color coolant do you have?

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