93' running rough - 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 11-04-2004, 01:10 AM   #1
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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?
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Old 11-04-2004, 01:34 AM   #2
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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
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Old 11-04-2004, 09:04 AM   #3
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Quote:
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!
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Old 11-04-2004, 10:57 PM   #4
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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.
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Old 11-05-2004, 12:26 AM   #5
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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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