Quote:
Originally Posted by sunny5280
When my X5 had a bad MAF there was no detectable operational issues with the vehicle. Only the illuminated CEL and codes are what alerted me. Lack of rough idle / stumbling does not mean the MAF is OK.
IMO cleaning the MAF is a waste of time. It won't hurt but I doubt it will solve the problem.
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Key word in my post is "usually." You are correct there will not always be a rough idle. From my experience the cleaning only helps temporarily but I think it a worthwhile consideration in troubleshooting a fuel/air problem if only because of how quick, easy and inexpensive it is to do and does malfunction over time.