Bad MAF? Car running like crap

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Apr 18, 2010 | 04:50 PM

ronsws6

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From: San Antonio, Texas

Bad MAF? Car running like crap

Think I have a bad MAF, but want opinions. Yesterday, (it was a rainy day) my car suddenly started running like crap.! (running rich, hesitating, shutters etc) eventually it ran ok. Now if I start it, it is fine for about 2 minutes then starts acting up again. Before I go drop 150-200 bux, any opinions?

Apr 18, 2010 | 05:44 PM

BLK02WS6

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From: on the dyno tuning in MD

Unplug it and find out...

Apr 18, 2010 | 06:03 PM

Kaltech Tuning

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Quote:

Originally Posted by BLK02WS6

Unplug it and find out...

Try this ^^ and if not look at your O2 sensors.

Apr 18, 2010 | 06:40 PM

70cartruck

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im having some issues with my car also......if it runs perfect in safe mode....with the mass air sensor unpluged.....can that mean a bad mass air flow sensor....it doesnt throw a code for it......?

sorry to hijack the thread.....

thanks

Apr 18, 2010 | 06:55 PM

BLK02WS6

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From: on the dyno tuning in MD

Quote:

Originally Posted by 70cartruck

That is actually called Speed Density, not safe mode. But yes, if it runs perfect with the MAF unplugged, you may have a bad MAF - but it could just be dirty. They make a MAF cleaner spray - look for it at the auto parts store. Also, look for anything caught in the wires - saw a guy had foam from the air lid gasket caught in a descreened MAF once causing issues...

Apr 18, 2010 | 07:22 PM

Mike454SS

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MAF sensors don't always throw a code (mine never did)...but you can tell with a good scan tool if it's giving ridiculous readings.

Either way, try unplugging it, try cleaning it properly, and scan the car before you spend any money on throwing new sensors at it.

Apr 19, 2010 | 11:00 AM

ronsws6

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From: San Antonio, Texas

Quote:

Originally Posted by Kaltech Tuning

Try this ^^ and if not look at your O2 sensors.

Thanks. For some reason I thought I recalled someone saying this didn't work on LS1's, so I hadn't tried it. I'll unplug it and see if it gets better. If it does I'll pull it and clean it first and see what happens.
Thanks again