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#1
08-13-2006, 06:35 PM
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E300TD Mass Airflow Sensor Failure??
Hi all,
Just installed a K & N filter in my '99 E300TD yesterday. After about an hour of driving, the "check engine" light came on, and I have noticed now my boost pressure is MUCH slower building, though no other noticeable symptoms. After reading through a couple threads, it seems the K & N MAY have allowed damage to the MAS??? Anybody else experience a similar failure with same symptoms? Any advice on a "stouter" MAS replacement? (I'd like to keep the K & N filter if possible, as I noticed a little better throttle response and power UP UNTIL the check engine light came on and spoiled the fun!) Any help appreciated!!! J.G. 
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#2
08-13-2006, 06:37 PM
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The oil used on K&N style filters will coat the MAF sensor and cause it to malfunction.
New MAF time. (Oh, and I'd get rid of that K&N if I were you.)
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#3
08-13-2006, 08:17 PM
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Have you checked the codes to make sure the MAS is the problem. I've had a K&N filter on my E300 since it was new. My MAS went bad at 75K miles and I now have almost 95K with no problems. Just follow the directions on cleaning and reoiling. Too much oil is a bad thing in this case.
MAS are a R&R item on these cars and it seems 75-90K is all you can expect from them. Buy right here at Fastlane and save a ton over the dealer. Less than 10 min to install. Good luck. 
__________________
99 E300 133K  98 ML320 99K 87 Saab 900 Turbo Conv 123K 
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#4
08-13-2006, 08:37 PM
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Thanks...going to check for a code tomorrow...and now find out why my fuel pump is leaking all over the place!
J.G.
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#5
08-13-2006, 09:16 PM
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Take electrical cleaner and spray a MIST on the sensor wires. DON'T SPRAY A JET AT THE WIRES. See if that helps. See the post: Mass Air Flow Sensor alternative
__________________
01 Ford Excursion Powerstroke 99 E300 Turbodiesel 91 Vette with 383 motor 05 Polaris Sportsman 800 EFI 06 Polaris Sportsman 500 EFI 03 SeaDoo GTX SC Red 03 SeaDoo GTX SC Yellow 04 Tailgator 21 ft Toy Hauler 11 Harley Davidson 883 SuperLow
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#6
08-14-2006, 01:24 AM
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I'll give the electrical cleaner spray fix a try tomorrow.
Many thanks! J.G.
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#7
08-14-2006, 11:41 AM
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If you want to keep the K&N, here is a little info a friend of mine shared. Clean the filter thoroughly, just like you would do for a recharge, then spray only the outside of the filter with the recharge oil.
__________________
Sam 84 300SD 350K+ miles ( Blue Belle )
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#8
08-14-2006, 01:15 PM
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Dump the KN filter and get an afe filter, works a lot better and no oil.
__________________
2005 SL65 1999 E300 1995 E300 1994 SL320 1988 560SL 1987 300TD 1982 300D 1955 300SL
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