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Old 10-01-2001, 06:06 PM   #1
Scooby Specialist
Member#: 7113
Join Date: Jun 2001
Chapter/Region: TXIC
Location: Minnesotan in Texas
2008 Spec B

Exclamation have a bad MAF? important tip...

For those of you with turbos on your MY99 and your MAF seems to be going rather often you may want to try this trick I found on my car to bypass or fix the problem. My set-up includes an AFC so that may have something to do with it. My MAF went after only 3000 miles after I bought it, then only 300 miles, and then 3 miles. Wierd huh? Actually it was very frustrating, but this is something I found out about how to make it work again without throwing another $300 MAF at it again and again.

Whenever the MAF "fails" (it happens randomly on my car, seriously) I pull the connector to the MAF and run it in limp mode for a while (anywhere from 50-100 miles), When I get to place where I have a friend handy I start the car in limp mode, let it warm up for a minute or two (more in colder conditions, I actually wait until I see the A/F meter starts showing the engine doing closed-loop operation) and then rev the engine up to ~2000rpm and have my friend plug the connector back in. The engine doesn't die like if I try to restart after the MAF "fails" but stutters when the MAF is reconnected and then runs fine. I then rev it up past 3500 a few times and then let it idle for about 5 minutes. After that the car runs fine until the MAF randomly "fails" again. I'm not really sure if this has to do with the MAF or not or the AFC. But after reconnecting the MAF the ECU is getting a signal and runs fine (or as fine as it normally does).

So before you throw that MAF out give this a try. It won't hurt anything running in limp mode for a short period of time, although it may after repeated occurences. Just a helpful hint.

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Old 10-02-2001, 12:28 AM   #2
Delicious Tuning
Member#: 1990
Join Date: Jul 2000
Location: San Diego, CA

I am wondering if you have a bad connection to your MAF? I had a loose wire attached to my MAF once and it caused my MAF to fail. But itreally didn't fail, it was the fact that the connection was bad. Anyway i fixed the connection and that seems to have the solved the problem. Just something ot look into. Also make sure all your ground are connected well, that was another issuse i had form time to time.
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Old 10-02-2001, 08:58 AM   #3
Scooby Specialist
Member#: 2348
Join Date: Sep 2000
Chapter/Region: MWSOC
Location: St.Louis
2006 WRX TR
Steel Grey Metallic


that sounds like an electrical or computer problem....plug it into an OBD scan tool and see what pops up...
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