2001 oldsmobile aurora
repairs made = crank sensors upper and lower
Dear BL: when i start my car it is hard starting and rough
idle..occasionally high idle.. other times normal it also stalls at
stops.. engine light on... no codes(snap on 2500) that make sense... once
in a great while low oil pressure came on screen...







BL:
If the engine light is on, it should have a code. After replacing crank position
sensor(s), you also need to perform a 'Crank sensor position re-learn' procedure.
Dont think that is available on a snap-on scanner. If that is not done, it will set a light
and cause a stall condition and hard start.
Another cause for hard start and stall is the fuel pressure regulator leaking fuel into
the vacuum line causing a rich condition.
Oil pressure sensors on that 4.0 engine are a common failure for the oil light.

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