I was told that if I take the connection off the MAF while the car is running the car should shut down. If it doesnt shut down then the MAF needed to be replaced. When I performed the test, the car puttered real bad and seemed to be ready to shut down however it didnt shut down completely. Does this mean that my MAF needs to be replaced?
Mass Air Flow Sensor on 1994 Volvo 940
by shenikah in Columbia, MD on September 23, 2010
ANSWER by ZeeTech on September 23, 2010
It's not the perfect way to test a MAF. What is the problem with your car? If you could give us some more info we might be able to help. Zee
ANSWER by Bret Bodas on September 23, 2010
This is not a good way to diagnose a bad MAF sensor. Ideally you should check the diagnostic trouble codes and fuel pressure. However disconnecting the MAF probably set a code so that's not too reliable. I would check the codes, write them down, pull fuse #1 to reset the codes, drive the car and recheck the codes. Also check the fuel pressure. Find out how to read codes here: http://volvospeed.com/CheckEngine.php Post the codes and we can likely provide more info.
Engine stalling/stumbling problems can be caused by a failing mass air flow sensor.
Car starts but runs rough. will stall out if foot pressure is not maintained on gas pedal.