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94 Buick lesabre no start
94 lesabre with 3.8. Conditions started as a stutter then stalling. Was able to limp the car back home, starting and dying the whole way. Checked it out and found no cranking rpm's. Replaced crank sensor and cranking rpm's came back and car started. Performed tune up on car and some other misc maitnence. Gave the car back to my brother, he drove it for a day with no problems, then it wouldn't start in the morning. Went over to check it out with scanner, and again found no cranking rpm's. After several attempts, the car all the sudden showed cranking rpm's the fired. After shutting engine off and restarting several times, let car sit approx 20'minutes. Then once again, no start, no cranking rpm's. Removed "new" crank sensor and returned for warranty. Also removed and had ICM tested. Removed throttle body and all sensors, cleaned thoroughly and reinstalled. Broke TPS during process so had to replace. Fuel pressure stays at 45 psi and doesn't bleed off. Removed ground cabled from ICM bracket, cleaned and reinstalled. Put inline spark tester and found good spark. Security light comes on with bulb check and goes out. So summed up, new crank sensor, new tps, now new ICM (doner from good running car) new plugs, new wires, good tone ring on dampener, clean throttle body. Still occasional start and then no restart. Also car will Start, run a few minutes then die. When it does run it runs great. Any help on this would be great!
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Without being there to check it out myself, I can only tell you what I know about these cars as I used to work on them quite often. The MAF sensor was a big piece of garbage on these. One "technical" way we used to field test them is tapping them with a screwdriver handle while the car was running. If it stuttered or stalled, the MAF was bad. I would check that first to be sure.
EDIT- Also, a bad MAF doesn't always throw a code. |
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Totally agree with odinn7--install a new, non-remanufactured MAF Sensor (preferably ACDelco). Also, ensure the connector and harness are good.
If the problem persists, install a new ICM and coil packs. Testing ICMs and coils is virtually a waste of time. Instead, I recommend replacing these components every 120,000 miles or 10 years, whichever comes first. |
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