MAP senser

what does the map sesner actuly do? (it mounted on side of CARB. on my car) Does it go bad over time? Could their be something wrong with it cause ive seen the gas needle drop faster than it use to?

i have 91 sunbird le 2.2L

the Manifold Air Pressure sensor detects the vacuume or lack of, and compensates fuel delivery based on a stoich (sp) baseline (14.7 psi or 1 atmosphere, what the air pressure is at sea level).

The closer to sea level you are, the more fuel the computer needs to add, due to the air being more dense. The higher you are above sea level (Denver for instance) the thinner the air becomes, so you need to burn less fuel or become rich in the mixture.

So yes, a malfunctioning MAP sensor will use more fuel, but, you would throw a code and get a CEL, if it does throw a CEL, a jumper pin or a quick trip to an auto store will help you to determine the problem for sure.

thx for advise . sill not sure why the gas is being sucked down cause when i bought the car it was getting like 300 mi on a full tank. Maybe it is the gas prices.

i think it is the rings cause if u check my other thread called Low iddle problems. if the car has 132k on it, it can be anything.