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Old 01-10-2008, 07:35 AM
gmercoleza gmercoleza is offline
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Join Date: Sep 2004
Location: DFW / Collin County Texas
Posts: 1,882
Originally Posted by erubin View Post
Attach your OBDII scanner and read the air mass flow measurements generated by the sensor at WOT in 3rd gear and at 4000 RPM. You'll have to shift the car into 3rd. You have to catch your reading at 4000RPM so you may want a helper to read the scanner just when you hit 4000RPM so that you can remain concentrated on the road while accelerating on the highway. You want to see a MAF reading that is about 550kg/hr or more. Convert 550kg/hr as needed to match your OBDII scanner's mass flow units. For example multiply 550 by 2.2 and divide by 3600 to get it into lbs/sec. That's all the help I can give you.

BTW, don't do this during rush hour! you need an open highway.

Just realized you have a different car so you need to get the spec for your engine. Any MB tech with access to MB specs should be able to give you this. I have a friend at the dealership who gave me this for the car I was working on.
Sorry to threadjack, but are you saying a standard OBDII scanner will give MAF readings? I don't recall reading that in my scanner's manual. I thought only SDS could provide adaptation values and you had to use a multimeter in conjunction with MAF manufacturer documentation?
08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280
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