Crank position sensor. How cause inermittent stumble????

[Gene in NC]

Crank position sensor How cause intermittent stumble????

Some reports that replacing CPS solves intermittent stumble/stall problems in '89 525 and maybe others.

Logical that CPS failure causes no start/run. But, how does it cause intermittents.

[whiskychaser]

Crank position sensor How cause intermittent stumble????

Some reports that replacing CPS solves intermittent stumble/stall problems in '89 525 and maybe others.

Logical that CPS failure causes no start/run. But, how does it cause intermittents.

The CPS like an ABS wheel sensor just works by means of a small current being created by a chunk of metal moving past an arrangement of magnets and a coil. You can use a DMM to check them out but unfortunately it isnt infalliable. If the CPS doesnt send a trigger signal to the ECU you wont get a spark.