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International Automotive Technicians Network
Re: 1998 Chevy Silverado Cranks Hard
Posted to Technical Discussion Forum on 2/2/2023

Hi Phillip,

In addition to Robert's excellent advice, CMP RETARD doesn't update on those below 1000 RPM.

If you're at zero you're good. If you're adjusting it then you need to keep RPM over 1000 to keep the data live. Login to read more.