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2003 gmc envoy_sle
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Discussion Starter #1
Can anyone help me with the spark plug order, their firing order, direction of rotar cap - any other related info. I have a friend who installed new spark plugs incorrectly. Thanks very much.
 

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2004 chevy trailblazer_ls
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371 Posts
I don't think thats possible. There is one coil for each plug.If anything, he switched a wire on the coil pack, and it would require a pretty good effort to do that.
Most likely, a plug or two is cracked, sounds like a sloppy job.
 
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