I had my 5.2 engine replaced about 1000 miles ago with a reman. Since that time, it has been raising a P1391 code - intermittent loss of camshaft or crankshaft position sensors.

Engine runs great at all speeds.

Ok, easy I thought. I replaced the crankshaft sensor first, becuase it appeared to not work when i manually turned over the enginer while back-probing the sensor. No dice.

I then replaced the camshaft sensor. No dice.

Both sensors are getting the 5V in, so now I am stuck.

Am I looking at an intermittent short possibly? One intersting thing I noticed. In 2 recent trips to Florida, the code would clear after a day or so driving there. Once I returned to Ga, it comes right back. Thought maybe it was due to heat or humidity that is affecting the wiring.

Anyone have any ideas?

Randy

 

Hi I have identical symptom w/ new reman. install. Did you find a solution? Does anyone have any advice?

 

remove dist cap,rotor then check " fence" that triggers cam sensor,some times they come loose causeing timeing to change