Question about 2005 Chevrolet Colorado

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05 Colorado - New Spark Plugs, Rough Idle

I just bought new plugs for my Colorado. I put them in and it started idling rough *Note - There wasn't a problem/rough idle with the old ones .. but its time to replace them*. So, I put the old plugs back in, and it was still idling rough and then the check engine light came on. Anyone have any advice on what the problem might be? Thanks in advance!

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Wrong plugs get the old style, take back the new ones. There is a push to get everyone to use those new style with the fancy metal and the new tip design, it's bs.

Posted on Feb 21, 2012

  • Powerwashme Feb 21, 2012

    Also, clean throttle body well, if you clean it well you should find a coffee colored residue (gasoline varnish) lining the inside of throttle body, use MEK or appropriate cleaner to remove varnish, polish with clean cotton cloth, make certain to not damaged the sensor and fuel fitting.

  • Powerwashme Feb 21, 2012

    Multiple sensors can cause the symptoms. Also use mass air flow cleaner on the Maf sensor which sits inset the intake tube just after air cleaner, this will help!


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  • Chevrolet Master
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Sounds like you got two wires mixed up. Check your firing order. If not that, then you dropped a spark plug and flattened the gap. If it's a V6 the firing order is 165432. If it's an 8, it's 18726543.

Posted on Feb 24, 2009


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