Question about 1996 Pontiac Grand Am

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Having trouble with 1996 Grand Am 2.4L. Runs ok in idle, but once in gear and try to accelerate it wants to die out. Change the fuel filter, used carb cleaner and still no better. according to test could be MAF sensor, but when called about price auto store told me, not a required part for my car. Is this true

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TRUE... you do NOT have a MAF (mass Air Flow) sensor
instead you vehicle uses a MAP (manifold absolute pressure) sensor

the difference is the MAF is around $300 and the MAP is $50

the MAF actual measures the amount of air entering the engine and the MAP "assumes" the air intake based on engine vacuum or the absence there of

to test the MAP, which will give you the concern you have...
you will need a DVOM (digital volt ohm meter) and a vacuum gauge

at sea level, no vacuum, record voltage at the MAP
then apply about 18" vacuum and measure voltage again

I cannot recall the specs but you should see something like 5volts with no vacuum and 2volts with 18" vacuum
(or visa versa)

in addition to your MAP, you could also have problems with your TP 9throttle position) sensor which you did not mention if you replaced

keep me posted!

Posted on May 27, 2010


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