try crank sensor

P1391 Intermittent Loss of CMP or CKP

Answered by BMRFIXIT (expert)
19,736 answers provided

Replaced both sensors. Should I disconnect the battery/ will this reset the computer?

Response from Krash
1 question asked

What about the ring that is behind the camshaft gear?What is the chance this is bad? dont really want to pull this motor back down but, will if i have to.

Thanks

Response from Krash
1 question asked

did u make sure of the wiring
is it all pluged in and nothing get damage whille installing the engine

Answered by BMRFIXIT (expert)
19,736 answers provided

did u make sure of the wiring
is it all pluged in and nothing get damage whille installing the engine[/quote:a306f003d5]
On the 4.7 u can remove the cam sensor and inspect the wheel
if loose or damage
tone wheel is located under CAM SENSOR IN FRONT ENGINE PASS SIDE

Answered by BMRFIXIT (expert)
19,736 answers provided

I am pretty sure everything is plugged in. I have removed th valve cover and can see the sensor and the wheel. The wheel is not loose and the plate is not bent, other than that i am not sure what kind of damage to look for.

Response from Krash
1 question asked

ok lets start over
truck no start after new engine install
do u have fuel pressure
do u have spark
do u have injector pulse
did u check the ASD relay
unplug and plug the BCM
because the code u have it may be only that the cam and crank sensor are not in sync
let me know

Answered by BMRFIXIT (expert)
19,736 answers provided