I hate the check engine light - 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 11-24-2005, 08:18 PM   #1
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Default I hate the check engine light

Ok so yesterday I was driving home, going about 60 mph and the cars spedometer drops to zero and goes right back up to 60 and the car kind of makes a thump noise as it hesitatied for a second. Ran perfectly fine before and after that.

There was no light YESTERDAY

Then today, Im driving the car around all day and about an hour ago, the check engine light came on.

Any ideas?
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Old 11-24-2005, 10:37 PM   #2
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Tighten the gas cap and see if it goes out would be my first thing to do.
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Old 11-24-2005, 10:51 PM   #3
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Vacum Leak? Would that cuase the wierd hesitation?
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Old 11-24-2005, 10:58 PM   #4
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being obd II I would hit up the autozone/advance/shucks tomorrow.
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Old 11-24-2005, 11:06 PM   #5
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no-can do unfortunatley, work all day then another thanksgiving thing right after work, soonest is saturday
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Old 11-25-2005, 01:05 AM   #6
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that almost sounds like a power surge. Its like your cluster reset itself while driving, it shoudln't do that. Your spedometer is controle via PCM, so it is 100% electronic dependent. I havent the slightest idea at what code it might of thrown.
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Old 11-25-2005, 07:52 AM   #7
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Quote:
Originally Posted by Garb
Vacum Leak? Would that cuase the wierd hesitation?
I wouldn't think so, a vacum leak would cause a sustained problem/symptom. Getting it scanned for any DTC is imperative. If just the speedometer fell to zero for a second in concert with the hesitation, I'd be looking towards the PCM. The other indications on the instrument cluster were not affected by this?
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Old 11-25-2005, 12:01 PM   #8
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Interesting. The VSS is in the trans. If it'* not an electrical problem, it'* a trans problem.
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Old 11-25-2005, 02:00 PM   #9
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Quote:
Originally Posted by willwren
Interesting. The VSS is in the trans. If it'* not an electrical problem, it'* a trans problem.
Bill, Not sure of this on the 96-99 Bonns, I think the VSS signal is sent to the instrument cluster module via the PCM.
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Old 11-25-2005, 02:12 PM   #10
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Quote:
Originally Posted by markwb
Quote:
Originally Posted by willwren
Interesting. The VSS is in the trans. If it'* not an electrical problem, it'* a trans problem.
Bill, Not sure of this on the 96-99 Bonns, I think the VSS signal is sent to the instrument cluster module via the PCM.
True. But if the sensor signal drops out?

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going about 60 mph and the cars spedometer drops to zero
Quote:
makes a thump noise as it hesitatied for a second
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