Could this be a problem with the crankshaft positioning sensor? Are there any other electronic control modules or sensors that could cause this intermittent problem if they are beginning to fail?

Asked by Feb 22, 2015 at 10:42 AM about the 2003 Pontiac Montana

Question type: Maintenance & Repair

The engine will stop running at completely random times, whether at slow speeds on
surface streets or at full speed on the freeway. The last experience was stalled on
freeway after running for 30 miles without issue and then stalled.  Had to restart the
engine at least 10 times to go the next mile.  Then let the car cool down for a couple
hours and then drove back 30 miles with no problem.  Plenty of fuel in the tank and the
cooling system was just worked on by a professional mechanic and the engine was
not overheating.  Mass air sensor was just replaced with a new part from GM.  No
indicator lights showing on the dashboard.

3 Answers

47,465

Possibly the crankshaft position sensor, bad fuel pump or bad fuel pump relay. Also there are other things that can cause this. Does the check engine light come on?

1 of 1 people found this helpful.
85

c.s. pos. sensor gives u a no fire when it goes bad. wouldnt run at all. check for good fuel pressure. check for good spark. i would still take it and have a diagnostic ran on it first. just because check.engine.light doesnt come on.doesnt mean its not storing a trouble code.

Thank you for the information...I will follow up on the fuel pump rely idea. We have already checked the the fuel pump, fuel pressure and good spark. We have taken it to a master mechanic and it still has the same problem. Thanks again.

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