GM 6.0 Misfire Under Load – Secondary Ignition Failure (Silverado/Sierra)
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YouTubeCarAraC
GM 6.0 Misfire Under Load – Secondary Ignition Failure (Silverado/Sierra)
Diagnosing a severe shudder or misfire on a GM 6.0L Vortec V8 (LQ4/LQ9) that only occurs under heavy load, such as towing or hard acceleration. This issue is the definitive sign of a secondary ignition failure, not a dirty Mass Air Flow (MAF) sensor. Under high cylinder pressure, the electrical resistance across the spark plug gap increases ...
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