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Old 06-15-2003, 03:55 PM
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blackmercedes blackmercedes is offline
Just a guy
Join Date: Dec 2000
Location: St. Albert, Alberta, Canada
Posts: 3,492
Originally posted by stevebfl
Slight leaks or lack of maintenance causes a dirt layer to insulate the film used on the new hot film mass meters.
Some time ago I had another tech mention that engine-air filter replacement frequency was related to AMM failure. I have been replacing the air filter element and cleaning the intake air filter housing and ensuring it's sealed at every other oil change. This may seem extreme, but the filter element take two minutes to change and is only about $20.

So far, no problems. (Touching wood)

Steve, I'm wondering about terminology. The dealer refers to theat part in my C230 as a "Mass Airflow Sensor" but you explain that MAS and Air-Mass-Meter are different things. I am curious as to how they are different. Both units seem to use a hot-film set up that is lacking durability, unfortunately.
John Shellenberg
1998 C230 "Black Betty" 240K
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