MAF Going Out?

[Izzmo]

What are the odds that the MAF goes bad in our cars?

One random day I started up my car and it started dying when coming to a stop or at a stop and stumbling dead. I replaced the TPS, no air leaks, no misfires.

When I unplugged the MAF and let it run and drove it around for a while, the idle was actually where it should be and it was running smooth.

So, does all this point to a bad MAF?

 

[luigisho]

Sounds like it. Did you plug it back in?

 

[Izzmo]

Yes I did

 

[Mr Anonymous]

One of the most overlooked items in diagnosing rough or poor running is a dirty MAF sensor.

MAF sensors can often fail due to excessive heat or a breach in the electronic pack that allows moisture to contaminate the electronics.

If cleaning the MAF filaments with a non-residue electrical contact cleaner (or over-priced MAF sensor cleaner from the auto parts store) doesn't alleviate your problems, then you may want to try a different sensor. It can also help to disconnect the battery for a minute after cleaning/replacing the MAF to clear the keep-alive memory in the PCM to reset the adaptive tables.

 

[ThatSHO]

sounds like its going out. unplugging it while the car is running makes the car idle really bad

 

[Sam]

maybe

Difficult to tell if MAF is going a little bit bad. PCM will compensate for failing sensor by using preset values to keep the care running. When it really fails, you should notice poor fuel mileage & poor performance.

could also be:

open EGR valve @ idle

IAC malfunction (after fix, must clear keep alive RAM, idle engine 15 minutes, drive, to allow PCM to reset)