Hi All, getting the MAP sensor P0108 code. When I hook up my scanner and look at the live figures, it shows "MAP 28 kpa" with Load at 27.5% When I start the car and do the back probe on the sensor, I'm getting around .90 volts at idle. When I press on the gas and increase RPM, the readings decrease to around .80 volts. I thought voltage readings were supposed to increase when RPM increases? Can someone tell me based on the these readings if the sensor is bad? She starts a little rough and idles a little rough, not too bad though. She runs great warm, no hesitation and plenty of power and acceleration. I recently replaced the valve cover gaskets and intake gaskets. I was getting an intake manifold leak code but that's gone after replacing the gaskets. Spark plugs are a year old also. Thanks

 

As vacuum increases, voltage should decrease.

A vacuum pump is the preferred method of testing, but you can also simply start the car and step on the throttle until it is wide open and voltage should decrease linearly....