Quote:
Originally Posted by worstmechanic
One of the Chevrolet truck forums is full of claims of improving mpgs by adding a K&N filter, and also, by cleaning the MAFS. Neither one of these SHOULD affect mpgs at STEADY STATE. But while driving, everything is constantly changing. It's possible that the control program just doesn't work as well when a K&N filter is installed, and that the engine may run lean, on average. In the same manner, a dirty MAFS may cause the proram to run rich, on average.
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I fully believe, from experience with my Ranger, that the K&N is the
cause of the dirty MAF. Mine started causing problems within 10,000 miles of the cleaning and re-oiling of my K&N, and after a cleaning, had similar problems about 10,000 miles later. I think the MAF gets contaminated with oil from the K&N.
I replaced my K&N with a stock filter 40,000 miles ago, and had no further problem with my MAF since.