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Re: The P1391 Intermittent Loss of CKP/CMP
Posted to Technical Theory Forum on 12/4/2018 1 Reply

I see that the injector voltage change and a hair over half a second delay before firing but it does not necessarily correspond to actual command to start or power to start.

Scoping the starter relay command wire and the S wire too would let you know if the ... Login to read more.

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