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Discussion Starter · #1 ·
In response to a recent failed emissions test at the local repair shop with a DTC "P0306 Cylinder 6 Misfire Detected"...I changed my spark plugs. After reading the forums about using copper in the 07, they were replaced with NGK V Power Spark Plug (zfr6F-11).

It now has a rough idle (it didn't previously). I've check the connections to the coils and I don't think I knocked anything out of place. Any suggestions on how to troubleshoot? Can it be safely driven for now, or should I head straight for the repair shop?

Thanks in advance!
 

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07Lifted,4X4,6sp-man,3.7L
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The owners manual says to use ZFR6F-11G plugs in the 3.7.
Is it possible one of the plugs insulation got broken during install?
 

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you could try putting the old plugs back in just to be sure, also check that you did not knock off one of the small vacuum
hoses.
 
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What did your old plugs look like? We're any of them fouled or in poor shape?
 
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Discussion Starter · #5 ·
Thank you for your replies - looks like one of the plugs had been dropped during install and the end damaged. This was replaced and all runs fine. Engine light still on so maybe a coil need to be replaced.
 

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07Lifted,4X4,6sp-man,3.7L
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Glad you found the problem.
Disconnect the Neg (-) battery cable for 10 minutes. This will clear the CEL. If it comes back on, then there is still a problem.
 
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