Please fill out the following to ask a question.
DESCRIBE ISSUE.... The vehicle is not mine but trying to figure this out. Apparently, it started running rough and got to the point where it needed to be towed home. CEL is on and only code is a P1391. The cam and crank sensor have been changed but the problem remains the same. I testest the plugs at both sensors and have the appropriate 5.5 v and everything seems good. If anybody has dealt with this before please let me know. I am not sure where to go from here. Thanks
this is a loss of signal either CMP or CKP .
Did you scan for codes OR try the key trick? Need to know ALL codes.
Ideally a lab scope to view the CMP and CKP wave forms as we tug and shake harness.
A scanner could observe signal as we move the harness - check the connectors tight, corrosion free and first several inches of wire as that is often where they fail
there is 3 wires at sensors..... did you check the other 2?
Anything that may lend a clue-
recent work? replaced ... adjusted.... cleaned....