HELP!!! Wants to stumble and die! (found the problem???) - Page 2 - 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 05-28-2004, 07:18 PM   #11
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Quote:
Originally Posted by BonneMeMN
Where'd the bad gas come from?

Beans? Burritos? (sorry i had to lol)
lol

Ok, problem kicked back up. Got some new info though. I got a new error code (one I don't like). I got "101 Mass Air Flow Sensor Error". Other errors were "171 Fuel Trim Low" and "131 Engine O2 Sensor Low".

After sitting there watching the engine run (kinda like a stareing contest) I got the impression that either the throttle plate (or something like it) was being iratically adjusted. I manually played with the throttle (levers by the intake) and raised and lowered the idle. I noticed that a few times the idle still iratically jumped up and down even though the idle cable and associated parts were not moved at all.

Does any of this help to paint a picture of what is going on?
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Old 05-28-2004, 10:31 PM   #12
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Well I had my IAC go on the Bonneville and most of the time when it goes it goes to a full 5 Volts so the car thinks that you have it floored. Which then will not let the car start. Mine died and stuck at 4.? volts so I was still lucky but Renee told me it was not idling properly, ( I was out of town as usual so I did not see what it was doing).
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Old 05-28-2004, 11:26 PM   #13
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I bet it'* the MAF, or bad gas....
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Old 05-29-2004, 10:26 AM   #14
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There seem to be indications that your engine is running too lean. It'* possible you have a restriction in the fuel system or that your fuel pump is dying.
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Old 05-29-2004, 05:46 PM   #15
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Remeber that code "101 Mass Air Flow Sensor"?

I cracked open my factory service manual today and followed the diagnostic procedures for that code. Here is how it went:

1) Clear all codes and try running the car again.
Did that, codes returned.

2) Enigine "off", disconnect MAF connector, Ignition "on", Terminal "a" to ground with voltmeter, should be 4-6 volts.
I found it to have 4.8 volts.

3) Connect a test light between terminals "a" and "c", Light should be on, is it?
Didn't have a light to test so I tested for voltage. Received battery volatage (12-13 volts) between connection. (effectively a "yes" for the light test)

A "yes" answer on #3 references to replace the MAF sensor connection or sensor. Do you gearheads agree with this? I only ask due to the cost of the part. It would suck to replace it and have the problem remain.
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Old 05-29-2004, 10:26 PM   #16
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The code for MAF came up for a reason. The O2 code was probably because of a lean condition caused by the MAF adjusting the fuel too lean. The problem came up all of a sudden which is indicative of an electrical fault. All the symptoms are leading towards the MAF (stumbling and almost stalling). If it was my car the MAF would get changed (I have done mine twice for the same symptons).
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Old 05-30-2004, 04:44 AM   #17
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Quote:
Originally Posted by A Bonnie Canuck
The code for MAF came up for a reason. The O2 code was probably because of a lean condition caused by the MAF adjusting the fuel too lean. The problem came up all of a sudden which is indicative of an electrical fault. All the symptoms are leading towards the MAF (stumbling and almost stalling). If it was my car the MAF would get changed (I have done mine twice for the same symptons).
My thoughts as well, just waiting to see what codes you got, and your interpretation.
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Old 05-30-2004, 01:26 PM   #18
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Quote:
Originally Posted by A Bonnie Canuck
The code for MAF came up for a reason. The O2 code was probably because of a lean condition caused by the MAF adjusting the fuel too lean. The problem came up all of a sudden which is indicative of an electrical fault. All the symptoms are leading towards the MAF (stumbling and almost stalling). If it was my car the MAF would get changed (I have done mine twice for the same symptons).
Thanks for the input. I'll order my new parts first thing tuesday (after the holiday ).
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Old 06-01-2004, 01:46 PM   #19
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Default HELP!!! Wants to stumble and die! (found the problem???)

Before you order a new MAF sensor, take the old one out and very carefully with a Q- tip clean the two wire elements inside. It'* a quick simple job and you might be suprised at the results.
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Old 06-12-2004, 12:58 PM   #20
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I got new parts last night from GMPArtsDirect and installed them this morning. Runs god as new again. :P

Thanx for everyones help on this.
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