Check engine light - 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 01-22-2007, 02:25 PM   #11
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are we even sure that its a Misfire....we dont know the code....

was the Check Engine Light Flashing??? because that is a Random/Multiple misfire
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Old 01-22-2007, 03:01 PM   #12
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Quote:
Originally Posted by 1993 SLE
was the Check Engine Light Flashing??? because that is a Random/Multiple misfire
That is technically a catalyst damaging condition with the light flashing. There is another code for random/multiple that will set a light but not flash it. (Yes..last weekend...lol)
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Old 01-22-2007, 08:32 PM   #13
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I only use premium fuel.

Using injector cleaner has definitely helped. The problem appear less often.

The check engine light comes on sometimes. It is not flashing. There does not appear to be a pattern. It seems random. Usually it will go out again some time later, usually after the car has been left (turned off) for some time.

I have recently replaced the plugs and the wires. This was an attempt to fix the check engine light problem.

I replaced the fuel filter.

I will try to get the codes.
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Old 02-05-2007, 01:25 PM   #14
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Fault codes are P0135 and P1406.

Replaced front oxygen sensor, egr valve/gasket, reprogrammed pcm calibrations.

Engine light still comes on occasionally....
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Old 02-05-2007, 01:49 PM   #15
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P0135 is Front O2 sensor heating issue.

P1406 I can't find.

What is the current check engine light from? If it'* the same codes (assumed) then you should check the wiring, and especially ensure none of your plug wires are touching the O2 sensor wires.
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Old 02-05-2007, 01:55 PM   #16
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I checked and couldn't find anything on P1406, either. I don't believe that to be a proper code.
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Old 02-05-2007, 01:59 PM   #17
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P01406 for a '97 is EGR position sensor performance (from Techinfo)

Maybe the same for '96?
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Old 02-05-2007, 02:13 PM   #18
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Called garage, P1406 is the EGR.

I suppose the check engine light may be a new problem, will cost me $95 to find out.

Is there another (cheaper) way to get the codes?

How do you look up the codes, are they online?
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Old 02-05-2007, 02:35 PM   #19
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Many auto parts stores will read the codes for you (hoping to sell you the affected part) or rent (for free) use of a code reader. You can buy a simple code reader for OBDII many places for about $30-40. Check out Techinfo section here on Bonneville Club under electrical/computer for code listings.

Here are some for sale at Harbor Freight. Note these only read codes. These are not scan tools.

http://search.harborfreight.com/cpis...ader&Submit=Go
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Old 02-05-2007, 03:48 PM   #20
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http://www.harborfreight.com/cpi/cta...emnumber=95210
looks to be a choice for a 96.

You mentioned scan tools. What are they? Are they worth the cost? Sounds like a tool that scans all systems and diagnoses problems
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