Start and Die - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 05-29-2007, 01:19 PM   #1
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1999 Pontiac Bonneville 3.8 engine 166,000 miles. it will start then die in about 4-10 secs ocaasionally will run for a few minutes then die. Fuel pressure is normal and flow is good. No engine codes of any sort. If you unplug the MAF it will run (idle is a little rough in this mode and it will then post a maf error code). Should I replace the MAF sensor? When it starts and runs for a few secs when it starts to die out there is a loud sucking sound form the air cleaner area I beleive the IAC is trying to bring the idle up. Any other ideas?
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Old 05-29-2007, 02:03 PM   #2
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Watch the security light. A VATS issue will prime the fuel pump...and allow the car to start..then run on that fuel only. This sounds very possible..or a serious vacuum leak.
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Old 05-29-2007, 02:44 PM   #3
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It never loses fuel pressure and the pump continues to run for a couple of seconds after it dies the pressure gauges then holds over 50 lbs pressure forever.
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Old 05-29-2007, 09:42 PM   #4
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I had a similar problem with my son'* '99 Grand Prix. Had good spark, good fuel pressure, no vacuum leaks, etc. A new MAF took care of the problem. It is not an inexpensive part, so be sure to rule other things out first.
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Old 05-29-2007, 10:53 PM   #5
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Well time will tell I got one from a salvage and put it on. Right now it starts right up and runs great. But it did that this morning before I went to work and it started fine this evening when I got home. Changed it after that. We will see. And yes that is pricey part $140 is the cheapest for a new one $40.00 for a salvaged one. It looked good so I think it is worth a try.
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