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Old 10-08-2019, 09:12 PM   #2
fdryer
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Join Date: Jan 2006
Location: NYC
Posts: 43,666
 

2003 L-Series 3.0L Sedan
Default Re: Is there a single component that can be the cause all 6 plugs to misfire?

It isn't likely for all six individual plug coils to fail all at once or even intermittently. There are error codes to point to individual coil failure. If every coil acts intermittently then it may point to coil wiring or ecm. And if going along this line of thought then injectors should be considered too. Not likely coils or injectors. Injectors might be considered if crap fuel is used in more than one tank fill. Ecm? Maybe but that's getting ahead of diagnosing this problem without GMs scantool for advanced diagnostics generic readers aren't capable of.

Some areas to consider common to general misfiring; loss of compression, valve timing, maf sensor, and fuel pressure.

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