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07/24/2008, 4:27PM
About: Pontiac Grand Prix
mass air flow sensor

I have a 1999 grand prix gt.  My service engine light came on and i went to auto store and used the computer.  It indicates the mass air flow sensor is problem.   So I tried some cleaner and reset the light. all was well but then the engine started a little rough one morning and it came back on. the engine runs great after that initial start, idles fine etc...  I would like to just replace the mass air flow sensor but want to make sure its not something else.    The car has about 110k miles.   On a 150 mile trip the light actually went off but when i restarted car after a bathroom stop, it came back on.    What do you think.   I have taken readings at the auto store several times.  always   mass airflow sensor.

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07/24/2008, 4:29PM

oh yeah , its 3.8l

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07/24/2008, 5:18PM

what did the exact code read? There are several different codes related to the mass airflow sensor.

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07/24/2008, 5:45PM

i will go get a reading tonight again.

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07/24/2008, 6:20PM

What did you use to clean it?

Try brake clean or carb clean.  Take a Q tip and lightly run it over the wire that runs across the diameter of the sensor and try that.  If that still doesn't get rid of the code, replace the the sensor.

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07/24/2008, 9:23PM

ok,  i went and got the read again.    it says   7 of 8 readiness then i go to look at code and it only says " Mass or Volume Air Flow Circuit Low Input"   no other codes.    I asked if it should have some more codes and dude said you may not be getting additional codes cause its a new problem.

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07/24/2008, 9:57PM

The sensor itself is going out, cleaning it will not help. Replacing it is your option.

FYI, use of any spray cleaner on the mass airflow sensor is NOT reccommended. In general, cleaning of any kind on most mass airflow sensors are NOT reccommended.

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What do you think?
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07/25/2008, 12:49AM

replace the mass air flow sensor you should see a increase in fuel economy

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07/25/2008, 9:01AM

ASE certified tech, and I've done this my whole career.  A small piece of dust or dirt on a mass air flow sensor does not warranty replacing it.  Cleaning it does not hurt it.

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07/25/2008, 9:12AM

Thanks.  Sounds like it for sure my mass air flow.   I don't feel to bad about going out and buying one.

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07/26/2008, 1:07AM

Then Jeff, you should know that a small piece of dirt would not effect it. A large piece of dirt would (and could be removed by hand.) I am also ASE, not a hard test if you know what you are doing.

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07/27/2008, 8:41AM

I replaced the mass airflow sensor and all is well.  I am also the proud owner of a new socket set that I will probably get very little if any use out of haha.   thanks

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07/27/2008, 8:57PM

Yes it will affect it.  Look, I'm not going to get into an argument with you about it.  I've had engines with MAFs run like crap, and cleaning the MAF took care of the issue.  Using something like brake clean or carb clean which is not oil and completely evaporates does not harm it.

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07/27/2008, 8:58PM

Thus why I said don't use oil to clean it, where are you getting that from?

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07/27/2008, 9:05PM

just change it cause it's gonna getr worse

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08/02/2008, 4:50PM

the mass air flow sensor doesn't change the way the car runs for the most part. My lights  been on for almost a year but I couldn't find an upgraded sensor. My car also was rough off the start but then runs fine after a minute sometimes it would die out right after I started it, the problem turned out to be the fuel pump resistor but I went through three mechanics who told me it MAS

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08/06/2008, 1:23AM

Well I put a new MAF sensor in and it took care of the idol issue i was having when i start the car.   Runs perfect again.  So I lucked out without going to the shop.   Yay for me, and thanks everyone.