ignition coil
08-17-2015, 10:07 AM
#46
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Join Date: May 2015
Posts: 30
Re: ignition coil
Been running great for about a thousand miles but just started hearing a random pop (backfire?) from the exhaust. Have a misfire code on cylinder 8 but plug and wire looks good. No power loss or engine cut back. Could it be a cat going bad? Only happens at idle when hot.
08-17-2015, 11:08 AM
#47
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Join Date: Nov 1998
Location: Hell was full so they sent me to NJ
Posts: 70,648
Re: ignition coil
If it's only #8, its most likely specific to #8 - plug, injector, contact in Opti cap, corrosion on wire in Opti end, bad valve, etc.
Do you have access to a scanner with "GM Enhanced Parameters", that will allow you to check the misfire count on all cylinders, to see if it really is specific to #8?
Do you have access to a scanner with "GM Enhanced Parameters", that will allow you to check the misfire count on all cylinders, to see if it really is specific to #8?
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