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International Automotive Technicians Network
Re: What does this relative compression test tell you?
Posted to Technical Discussion Forum on 2/27/2015

I always try to eliminate spark AND fuel when doing these tests, simply by using a trigger/remote starter switch at the starter relay. It will crank all day ignition off and you won't cause fuel washed cylinders or make it worse.

You won't have a sync pulse ... Login to read more.