Back again for help.....rough idle. - 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 07-13-2006, 06:26 PM   #1
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Default Back again for help.....rough idle.

New NGK plats., Napa belden premiums and some Duralast coils from AZ (All done within the last month. Still trying to find out what is causing this. Had performance issues as far acceleration but with the new coils this seems to be fixed, but once the idle kicks in its shakes the steering wheel I do have a code scanner and only one code still: P0303 (Cylinder 3 misfire). I found a couple posts about the fuel pressure regulator going bad in these cars, will be checking that out tonight. Any thoughts?

EDIT : Forgot to add, #3 injector was replaced with a new one from advance a while back. No change whatsover.
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Old 07-13-2006, 06:31 PM   #2
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Leaky or clogged injector most likely the culprit. Go get one at the junkyard and swap them, try that.
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Old 07-13-2006, 06:37 PM   #3
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Have you had any coolant loss?
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Old 07-13-2006, 07:51 PM   #4
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Try swapping the coil, wire & plug from #3 to #1 or #5. Examine the spark plug while it'* out, it could be cracked. If the problem is still on #3 it'* probably an injector problem.
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Old 07-13-2006, 09:13 PM   #5
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Nope, no coolant loss or leaking to my knowledge. Tank still reads full. Will double check the spark plugs again, just put the new coils on last night. CEL hasn't come back....yet.
Also could it be something else to do with fuel such as the fuel pressure regulator i mentioned in my first post? Someone also suggested a bad PCM but if that were the case I wouldn't be getting a code right? I think I remember a little gasoline smell around the regulator area, gonna double check again later. Thanks for the input.
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Old 07-14-2006, 12:00 AM   #6
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This is my second set of wires and plugs, Autolite wires from AZ practically disintegrated on me Can't beat the lifetime warranty on Beldens. Also had the IAC and the MAF sensor changed a while back with new parts from AZ.
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Old 07-15-2006, 03:58 PM   #7
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^ Bump
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Old 07-15-2006, 04:29 PM   #8
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If you're no longer getting the misfire code you'll want to look for any vacuum leaks.

Here'* something I just heard of the other day. Turn on a propane torch (just turn the propane on don't light it) & move the propane around the intake manifold gasket. If the idle improves it means the intake gasket is bad.
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Old 07-15-2006, 04:51 PM   #9
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Ya i've heard about something like that. Continues to throw the misfire code, still on cylinder 3. It is running better since the coils but right now the idle is crap.
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Old 07-15-2006, 05:02 PM   #10
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Quote:
Originally Posted by zeroburnz
Ya i've heard about something like that. Continues to throw the misfire code, still on cylinder 3. It is running better since the coils but right now the idle is crap.
I still have a feeling of a clogged, or leaky injector.
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