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.

93' running rough

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Old 11-04-2004, 12:10 AM
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Default 93' running rough

Well, I haven't driven the 93' for a while but my dad who is buying the car said it was running like ***t and will not buy it when its this way. So, I drove it around and it drove very bad. Misfireing, backfireing, and no SES light. Now I reved it up in park and it seemed to rev freely. I put in plugs before the Chicago trip in Aug 04', and new wires in Jul 03'. Any ideas?
Old 11-04-2004, 12:34 AM
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I would start with the basics. Fuel, fire, and air.
Check the fuel pressure if possible. It may just be a fuel filter.
The backfiring sounds like a timing issue though. Maybe a cam sensor.
To my knowledge thats all that controls the timing other than the PCM.
Also, check the voltages on the TPS . It should be like .4 at idle and over 4 at WOT.

JLathem
Old 11-04-2004, 08:04 AM
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Originally Posted by jlathem
I would start with the basics. Fuel, fire, and air.
Check the fuel pressure if possible. It may just be a fuel filter.
The backfiring sounds like a timing issue though. Maybe a cam sensor.
To my knowledge thats all that controls the timing other than the PCM.
Also, check the voltages on the TPS . It should be like .4 at idle and over 4 at WOT.

JLathem
Those items would trip the SES light.

I would start with the fuel filter. Cheap insurance. Sounds like the engine is fuel starved!
Old 11-04-2004, 09:57 PM
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It was the coil packs. Two were burned out. That miss under load that i've had all along may be gone now. Right in time to sell it to my dad.
Old 11-04-2004, 11:26 PM
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Before I read that last update, I was going to say regardless of plugs and wires, it'* classic ignition.

Good work, bud. Good sale, too.
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