2002 Buick LeSabre stalling


Old 08-17-17, 06:50 PM
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2002 Buick LeSabre stalling

Having issues with a 2002 Buick LeSabre. It will start but stalls almost immediately. Replaced both head gaskets, intake and exhaust manifold gaskets, rebuilt the fuel injectors and replaced cram and crank sensor and fuel filter and the security system still works. Any tips?
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Old 08-17-17, 07:17 PM
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I think that you did a lot of work for nothing. It could be as simple as an IAC (idle air control) valve.
Old 08-17-17, 08:52 PM
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what tests have you done? was all this work done and now you have this problem or was it why you did the work.
Old 08-18-17, 11:48 AM
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A couple of things to consider...

Check would be the oil pressure sensor. The fuel pump circuit goes through the oil pressure switch, but is bypassed in start mode for a few seconds. If the car cranks and then does not close the oil pressure switch the fuel pump loses power and quits pumping. Perhaps the switch is bad or the wires on the switch have become disconnected. The oil pressure switch is located above the right side drive shaft/CV shaft.

Could also be the mass air flow sensor. May be just its age or damaged during all the rebuild work, they are kind of fragile? Should throw an error code if this is the problem, so easy for a mechanic to check. If you want to check yourself, a very cheap basic code reader is here...

Old 08-18-17, 12:20 PM
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Has the computer been checked for codes?
Old 08-19-17, 10:46 AM
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Temporarily resolved

It was the MFS sensor. Thank you for the advice.
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