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2002 chevy trailblazer_lt
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Discussion Starter #1
Hey everyone- I'm a newbie on the site. I bought a 2002 TrailBlazer LT here in Wisconsin with the 4.2L for my son to go to college in. He needs the room for his music gear and so we upgraded from the old Blazer platform. Having issues with rough running, rough idle and dieseling. I hear a reflash of the PCM is in order. Any other ideas?
 

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2002 chevy trailblazer_lt
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To Garth

Checked the light and the only code that came up was a cyl 3 misfire. Thanks for the reroute. I am going through diagnostics on all of the related sensors first before I do a pcm reprogram. Thanks again
 

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2005 chevy trailblazer_lt_ext
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I had the same code on my '05 about 10 days ago, just a week after I bought it "as is". It turned out to be the coil for that cyl., though the symptoms were just a slight misfire at idle, and occasional bogging on acceleration. Runs like a champ now, and fuel mileage went up right away, too.
 
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