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  #1  
Old 05-25-2004, 02:10 AM
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Join Date: May 2004
Posts: 2
ML320 MAF Cleaning

Hi Guys, new to this site, but was using it for research on my 98 ML320. Just changed plugs at 100,000 but vehicle still ran poorly. Tried cleaning MAF with alcohol but no luck. Then a friendly mechanic suggested Castle intake system cleaner. Took out sensor from intake tube, sprayed it thoroughly, then used low pressure compressed air to dry.
I cant believe how it runs now. Highway mileage between 24-25mpg. Was around 20-21. Acceleration smoother. Best part I didnt have to buy the new sensor I was ready to purchase.
Hope this has been helpful.
Thanks for all your help.

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  #2  
Old 05-26-2004, 07:28 PM
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Join Date: Sep 2002
Posts: 302
MAF Sensors are usually replaced..

No one cleans them, MB just replaces them, you probably made it worst by trying to clean em.. Maybe its your O2 sensors?
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  #3  
Old 05-26-2004, 11:26 PM
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Join Date: Feb 2001
Location: Oconomowoc, Wisconsin
Posts: 37
Clean it first

Of course you should try cleaning first. After I had mine replaced, at 57,000 miles, at a cost of $512 I did a little web searching and found a lot of info on cleaning MAF sensors. Just because an auto dealer's Service Dept. replaces the entire assembly doesn't mean its in the customer's best interest. They make a lot of money on the parts and labor. It seems to me MB has all too many failures of the MAF sensors. I read somewhere the air cleaner element may be losing some very small fibers that catch on the sensor wires and screw up the signal to the computer. Could it be that this is why the air cleaner element design was changed?
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Tom H.
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  #4  
Old 05-27-2004, 12:08 PM
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Join Date: Feb 2004
Location: sunrise, fl
Posts: 82
I had P0173 which turned on the CEL and P0170 pending. I cleaned the MAF, new air filter and wiped some silicon oil on the rubber gasket and on the inside section of the hose that attaches to the other side. Then I cleared the codes, and have driven approx 800 miles so far with no problems.

The MAF did not look dirty to me though. I think I may had a leak on the rubber ring gasket because it is the only thing that did'nt look very good. I am replacing it next weekend.

Important to note: although I had the CEL on, there was no rough iddle or any other performance problems that I can feel driving normally. I had the CEL on for one day before I "fixed it".

Hope this helps.

Rene
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  #5  
Old 05-27-2004, 12:09 PM
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Join Date: Feb 2004
Location: sunrise, fl
Posts: 82
Oh, forgot to mention: ML320 '99, 76K miles, firts time CEL comes ON.

Rene

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