2001 Oldsmobile Aurora. Repairs made = crank sensors upper and lower. When i start my car it is hard starting and rough idle..occasionally high idle.. Other times normal it also stalls a stops.. Engine light on.. No codes(snap on 2500) that make sense... Once in a great while low oil pressure came on screen.
IAnswer: f 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.