98 Gt with P0108 code

[mrush99]

New here and this is first problem we had with our Grand prix in 3 years. SES light is on and code is for P0108. Has to do with Baro/ MAF sensor. Only noticed fuel mileage has decreased.
So is there a common problem with these to look at or is the MAF sensor most likely need to replaced. I know intake is tight and Throttle body is clean inside.

Thanks

 

[Fivefingerdeathpunch]

P0108 is a MAP sensor, not the MAF.

The MAP (Manifold Absolute Pressure) sensor measures engine manifold negative air pressure. It's usually a three wire sensor: a ground wire, a 5 volt reference wire from the PCM (Powertrain Control Module) to the MAP sensor, and a signal wire that informs the PCM of the MAP sensor voltage reading as it changes. The higher the engine vacuum, the lower the voltage reading. The voltage should range between about 1 volt (at idle) to about 5 volts (WOT wide open throttle).
If the PCM sees the voltage reading from the MAP sensor is greater than 5 Volts, or if the voltage reading is higher than what the PCM considers normal under certain circumstances, a P0108 DTC will set.

 

[mikedinthecity]

i would replace the sensor and the gromet, or o ring also the pcv is nder the map, get one of them too

 

[mrush99]

OK i will try the map sensor and pcv looks to be a cheaper route then MAF sensor.

Thanks

 

[BillBoost37]

Most other sensors are cheaper than the maf.

 

[mrush99]

Well it was the Map sensor. Got 27mpg on trip to north shore so im happy.

Thanks