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Re: Compression waveform analysis
2004 GMC Envoy 4.2L (I did misidentify the year in the 2
images provided with the original post). Yes, it has
variable exhaust cam timing. ALLDATA doesn't specify how
many degrees, but here is Cylinder 2 at idle [2004 GMC
Envoy, Engine/Propulsion waveform]. ![]()
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