'95 Caprice LT1 idling rough after plug change? - Chevy Impala Forums

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post #1 of (permalink) Old 05-30-2012, 03:20 AM Thread Starter
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'95 Caprice LT1 idling rough after plug change?

Hello,

I have a '95 Caprice with a LT1 and it just turned 80,000 miles. At 80,000 I change the Spark Plugs to AC Delco Platinums and had the Transmission Flushed and Serviced. After doing this to it, it has developed a rough idle. The car has always idled so smooth, so this was a big surprise. It seems to idle worse when its in gear. It has plenty of power and doesn't hesitate at all. It just runs rough at idle. All the plugs were gaped 0.050". There are no check engine lights on. I'm really confused here....

Thanks,
Erik
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post #2 of (permalink) Old 05-30-2012, 05:06 AM
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Trying to gap platinum plugs is likely to damage the platinum pucks.

I would look for a plug wire problem.

Look underhood in the dark, maybe bring a spray bottle with water to try and induce arcing.
At one point there was a bad batch of Delco plugs out there that leaked combustion pressure and you could see a blue glow underhood around the plugs when running in the dark.

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post #3 of (permalink) Old 05-31-2012, 07:37 PM
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+1 with DJ. But also, make sure all your plug wires are where they are suppose to be, and not crossed by accident. Remember, wire boots must click twice.

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post #4 of (permalink) Old 06-01-2012, 05:21 AM
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Quote:
Originally Posted by Dwayne J View Post
Trying to gap platinum plugs is likely to damage the platinum pucks.

I would look for a plug wire problem.

Look underhood in the dark, maybe bring a spray bottle with water to try and induce arcing.
At one point there was a bad batch of Delco plugs out there that leaked combustion pressure and you could see a blue glow underhood around the plugs when running in the dark.
Listen to this man.
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Originally Posted by Crime Scene View Post
+1 with DJ. But also, make sure all your plug wires are where they are suppose to be, and not crossed by accident. Remember, wire boots must click twice.
Also check this out. Crime Scene said exactly what I was going to suggest.

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