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Re: Compression waveform analysis
Posted to Technical Theory Forum on 4/28/2009 6 Replies

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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