I stumbled upon this at benzworld:
http://www.benzworld.org/forums/w163-m-class/1288255-car-vibrates-idle-hesitant-accelerate-diagnosed-2.html?highlight=clean+maf
Quote:
Originally Posted by benzworld.org
The best (MBZ) way to check a MAF is with key-on, engine-off voltage. Specs are .980v-1.030v, if above or below this, you MAF is bad. The MAF usually goes bad after you replace the air filter, especially if you have not replaced it in a while
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Does anybody know if this test sounds valid? Where exactly are the voltage measurements to be taken? I'd really prefer to test my MAF before messing with and potentially destroying an otherwise healthy component.