MAF code pulled Car idles rough

BRUSHCA

MEMBER
2005 BUICK RENDEZVOUS
90,000 MILES

MAF code pulled. Car idles rough and may stall if coming to stop/decelerating. Temporarily corrected with Seafoam. Already replaced fuel filter.

My car has been idling rough, and at times stalls when taking my foot off of the accelerator, upon coming to a stop. Even when it doesn't stall, the RPMs waver (tending to drop) between 500-1000 RPMs when idling. When my car does stall out, it will crank over again, with difficulty getting started.

I add Seafoam to the gas tank which tends to temporarily fix the problem for a week or two. I brought my car into a shop for the problem and they pulled the code, which indicated that the mass air flow sensor was not working properly. I don't have a check engine light displayed. I recently replaced my fuel filter, so I know that is not it.

Any suggestions? Do you think a faulty MAF could cause this?

3 Replies

SATURNTECH9

MECHANIC
30,869 POSTS

Do you have any codes now have you checked?Also have you tried cleaning the mass air flow sensor with mass air flow sensor cleaner to see if it runs any different?

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Friday, September 14th, 2012 AT 9:43 PM

BRUSHCA

MEMBER
2 POSTS

Sorry for my delayed response. Since we last spoke, I have tried cleaning the MAF along with replacing it with a new MAF once the CEL came on. The problem corrected itself for about a week and a half and then started up again. The car would stall, I would wait, restart and it would run fine. Just this week, my car began to act up and this time the CEL came on again and coded for MAF again. I know it is not the MAF because I just replaced it for the second time (from the dealer). What else could be faulty, causing the computer to throw a MAF code? I have checked for vacuum leaks and replaced my spark plugs. Could it be the IAC? What are your thoughts?

Thanks.