Cylinder 3 misfire after track day - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 11-06-2007, 09:38 AM   #1
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Default Cylinder 3 misfire after track day

On the way home from racing I noticed I had a check engine light that wasn't on before I ran the car that day.. Autozone sez it'* a misfire on cylinder 3. They said either I need a tune-up, I have a bad injector, or dirty injectors.

I just did a full tune-up like 6 months ago....

Should I run some of that fuel injector cleaner through it and see if that helps? What else could be my problem
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Old 11-06-2007, 09:42 AM   #2
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If you haven't already, check the plug and wire. Also pull it from the coil and look for any corrosion.
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Old 11-06-2007, 10:00 AM   #3
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Quote:
Originally Posted by BillBoost37
Also pull it from the coil and look for any corrosion.
for dummies, please- that means to unscrew it, right?
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Old 11-06-2007, 10:30 AM   #4
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Nope..they are merely pushed on. Wiggle and pull should remove the wire from the coil post.
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Old 11-06-2007, 11:53 AM   #5
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Is it possible that a wire is loose? I remember Peace having a loose wire and it caused a misfire, unless I'm horribly mistaken
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Old 11-06-2007, 12:07 PM   #6
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It is very possible. Peace'* wire was litterally laying on the plug, but not pushed on all the way.
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Old 11-06-2007, 12:23 PM   #7
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pushing the ignition to it'* limits will also cause week components to go. You could very well have busted the plug or wire.
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Old 11-06-2007, 01:02 PM   #8
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If everything else looks good, pull the #3 plug and check the gap.
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Old 11-06-2007, 08:04 PM   #9
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I pulled the plug, it looks clean as a whistle, and the gap was at .060. I kinda looked inside the wire, it.. SEEMED to look okay, there wasn't any obvious corrosion... I tried to smash it back on really well, they're tough to get on all the way Is there another thing that could be causing it? Does the dirty/ bad injector theory sound plausible?
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Old 11-06-2007, 08:29 PM   #10
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Try swapping #3 spark plug with #1 & swap #3 injector with #5.
If the miss moves to #1 replace the plug.
If the miss moves to #5 clean or replace the injector.
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