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Re: Compression waveform analysis
Posted to Technical Theory Forum on 4/29/2009

This particular vehicle doesn't have an EGR valve. Also,when we compare these two images we can see that the exhaust cam retards just about 25 degrees when the cam actuator is energized. [2004 GMC Envoy, Engine/Propulsion waveform] [2004 GMC Envoy, Engine/Prop... Login to read more.

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