My car was stalling as I was driving for no reason

ADEAL533

MEMBER
1997 CHRYSLER CONCORDE

My car was stalling as I was driving for no reason. Eventually the check engine light came on. I took it to Advance Auto and they scanned it. The 3 codes were p0725, p0700, and p1391. We replaced the input and output transmission speed sensors and the Cam shaft sensor. Before replacing the cam sensor it ran very rough. When you revved it and let go of the accelerator the tac dropped quickly. When it was trying to stall it was very violent. Now it runs smooth and I have driven it around my neighborhood for a few hours and seemed fine. No check engine light is on now. But then it attempted to stall, yet was not violent this time and did not last long like it did before. It happened 3 times all whiling turning hard right. It seems to occur when pulling off or driving at a steady speed. Not when coming to a stop or at a complete stop. Also it has not stalled while in the driveway, while revving or doing anything else. Only while actually driving it. Thanks. I appreciate any help.

1 Reply

SQM

MECHANIC
6,383 POSTS

Hello,

It sounds like you have an issue with the crankshaft position sensor.
The Crankshaft Position Sensor is mounted on the transmission bellhousing.
Over time with heat and vibration the crank sensor can loose its internal calibration.
It will fault and you will have intermittent engine stall. Typically it will get worse over time and can completely fail and not start the engine.
The code P1391 actually points to that sensor (CKP) as intermittent loss.

You might find these articles helpful:

https://www.2carpros.com/articles/how-a-crank-shaft-angle-sensor-works
https://www.2carpros.com/articles/symptoms-of-a-bad-crankshaft-sensor
https://www.2carpros.com/articles/crankshaft-angle-sensor-replacement

I have attached diagrams for your reference.

Please let me know of any questions.

Thank you.

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