code p1391 i replaced sensor plugs wires distributor muffler system egr valve im lost researched dodge forum possible flexplate replacement
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2000 Dodge Grand Caravan Question: engine misses while driving losses power on hills possible flexplate bad
Answer #1cardocIII from Gillespie's Auto Service, February 16, 2014, 06:28Master
Is this setting any codes other than the P1391?
To test for a broken flywheel we use a scope and compare the synchronization of the cam and crank sensor waveforms. Plus we pull a plug, install a pressure transducer and take a waveform which allows us to confirm cam timing.
P1391 is for an intermittent loss of the cam or crank sensor signal. (you didn't specify what engine) but diagnostics would be done with a scan tool like the DRBIII which will show the tech in the data stream whether the cam or crank sensor is active or not, which one was lost last, and typically if the signals are in sync or not. That data has to be backed up with live measurements with a scope of the sensor signals at the PCM and of the power and ground feeds to the sensors at the sensors. (It's best to concentrate on the one confirmed to drop out in scan data).