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MAP sensor pressure

Tiny
SLICK47
  • MEMBER
  • BUICK PARK AVENUE
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?
Sunday, July 29th, 2007 AT 10:20 PM

1 Reply

Tiny
CLY
  • MECHANIC
  • 308 POSTS
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
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Monday, July 30th, 2007 AT 4:56 AM

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