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ML 320 2001, 130k miles: Chasing Gremlin-Help! Codes P0100, P0170,P0173. Intermittent rough idle, about every 6-8 times at a stop in gear, place in nuetral and runs fine. So far: Spark Plugs, Plug wires, Air filter, fuel filter, trans connector plate, EGR, MAF (aftermarket now MB). Checked extensively for vacuum leak-none, multiple fuel injector cleaners. Does not change good engine idle when I un-plug MAF sensor connector? Now; during fast accelorating, missing, shifting late. I am now thinking fuel pump? What should the pump output pressure be? Test with guage at the rail? Any other thoughts?
 

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02 ML320 06 ML500
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Code P0100 along with codes P0170 and 173 directly relate to a faulty MAF.

You said that you have already changed the MAF Sensor and that it was an aftermarket one. Please tell us where you got this sensor and how much you paid for it and did it correct the codes for any period of time? You might have thought you got a bargain, but maybe you really didn't.

Please UPDATE YOUR PROFILE in USER CP.
 

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