MAP sensor pressure

BUICK PARK AVENUE
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SLICK47
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97 Buick Park Ave, 3800, 160,000 miles, checked pressure at MAP sensor, my understanding is you should have a positive pressure for sensor to work...what I discovered is a negative pressure (vacuum). What could the problem be?
Jul 29, 2007 at 10:20 PM
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CLY
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The map sensor works off of vacuum. At Idle with high vacuum(17 to 20 inchs) It will read somewhere below 2 volts and with the vacuum removed it will read up to 5 volts. As the engine is operated say under wide open throttle the vacuum level will decrease and the MAP sensor voltage will increase.


Cly
Jul 30, 2007 at 4:56 AM