SERVICE ENGINE SOON LIGHT PROBLEM - 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 12-16-2002, 01:51 AM   #1
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Default SERVICE ENGINE SOON LIGHT PROBLEM

I notice that my service engine light comes on from time to time. It is mainly when i have my heat on. Everytime i take my car to have it tested, nothing shows up on the computer. It is driving me crazy becuase i hate that yellow light. Please let me know any recomendations or advice that might help me find the problem.
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Old 12-16-2002, 12:22 PM   #2
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I have the same problem. I've had it checked out by three different mechanics since I've had the car. (18 months) They can't find anything. Mine seems to come on during initial braking. I've had my pads changed since then and the problem remains.
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Old 12-16-2002, 03:20 PM   #3
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On a 93, your braking system doesn't talk to the PCM. Not sure about a 94. Look specifically at the drivetrain and associated sensors, no brakes.
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Old 12-27-2002, 12:46 AM   #4
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Default SERVICE ENGINE SOON LIGHT PROBLEM

Great News! My grandfather found my problem. The large nut that holds my hub and everything to the car was only on by two threads. The only thing keeping the wheel on my car was my brake caliper. :( it wore my pads almost completely off. Amazingly no damage was done to my ABS, my bearings, or my rotors.He tightened the bolt and now i have no more light problems. Anyone who is having this problem needs to check that out.
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Old 01-01-2003, 08:47 PM   #5
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one word of advise, if the halfshaft nut was loose for any length of time, definitly replace the hub assembly. the outer cv joint and that halfshaft nut preloads the wheelbearing that is in the hub assembly, running it that loose will defintly damage the races on the bearings, it is 2 sets of ball bearings riding on races. are you sure it was the check engine light and the abs light on, the pcm and the abs modules are different.
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