Originally Posted by petreyg
Started out it would occasionally not start. Pulled a p0320 trouble code. I replaced the cam position sensor and the crank position sensor last night. I did get it started once before replacing these so the engine was warm. I noticed that it starts fine when warm. After replacing both sensors it started every time and ran great. This morning it was about 34 degrees and it will not start. Cranks over just fine.
Any ideas? I bought both sensors at autozone.
Thanks in advance. I have to drive to PA tomorrow and do not know what to do.
Firstly, those sensors are pretty simple Hall-effect pickups, and they are basically a device potted in a brick of epoxy plastic.
I could vaguely envision a sensor connection internally broken, but I can easily and clearly envision a broken wire in the connector that connects to the sensor, or a wire break at the pin on the wire at the PCM... especially if the problem exhibits on deep temperature drops.
I could slightly envision a bad connector where the harness connects to the sensor... unlike Ford, which has the almost always failing connectors, Jeep's connectors are pretty good.
As to crankshaft and camshaft position sensor failures, what I've most often found is that simply disconnecting the connector hood, and reconnecting, maybe three times, often corrects the problem.
Again, the sensors are built like bricks... solid, and not very prone to failure.
Now, when one changes out a sensor, they surely disconnect the harness, then reconnect the harness, after changing out the sensor... Duh.... is it.. er... possible... uh... no, surely not... that just plugging and unplugging the connector is the ....uh... fix?