Error code 1391

[nivre]

1997 Ram van 3500, engine light on, code reads P1391. Replaced sensors, both crank and ign, same reading, Engine stalls--help

[alloro]

An intermittent loss of cam or crankshaft position sensor as indicated by code P1391 doesn't necessarily mean it one of the sensors. I'd start wiggle testing the wiring or start taking readings with a meter to look for a loose connection.

[nivre]

Originally Posted by alloro

An intermittent loss of cam or crankshaft position sensor as indicated by code P1391 doesn't necessarily mean it one of the sensors. I'd start wiggle testing the wiring or start taking readings with a meter to look for a loose connection.

I cleaned all connections, runs fine for ten oe fifteen minutes, then engine stubbles as if bad fuel, then clears up and runs ok for a while till it stubbles again, There is a new pcm, crank sensor and cam sensor. Could flywheel be cracked???Just guessing.

[alloro]

Other than the two sensors, the PCM, or the wiring to them, the only other thing that can cause this code is a worn distributor shaft. A worn shaft will wobble and cause an intermittent reading from the pickup coil (cam sensor.)

[nivre]

Originally Posted by alloro

Other than the two sensors, the PCM, or the wiring to them, the only other thing that can cause this code is a worn distributor shaft. A worn shaft will wobble and cause an intermittent reading from the pickup coil (cam sensor.)

Will check for play in shaft in morning. Also will double check votages at connectors . I'll let you know.