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International Automotive Technicians Network
Re: Normal scan data graph of rpm while cranking
Posted to Technical Discussion Forum on 1/3/2018

Yes, scantool update rates can mess with graphing rpm data, but you could have problems with the distributor/ cam sensor assembly, or a problem with the crank sensor, or the flexplate, or the timing belt.

I would first disable spark/fuel (pull ASD relay) & c... Login to read more.