clemson_tiger

My C55 started having a little stumble to it yesterday and the check engine light came on. I took it to AutoZone and it read MAF sensor. Anybody have thoughts on this? Pics?

splinter

Used Pacho’s technique to R&R the MAF on a friend’s CLK55. Worked perfectly.

DIY tutorial:
https://mbworld.org/forums/2137884-post1.html

clemson_tiger

Thanks for that link...so I took the intake set-up off and cleaned the K&N's and used MAF cleaner on the MAF. The car, after several miles of driving seems to be running better and doesn't have the crazy unstable idle but still has a weird hesitation. I took the car back to AutoZone and had the check engine light turned off but after getting it home and turning the car off and the cranking it again its back on. Is this a symptom of a MAF going bad? Any thoughts on if there is an upgrade MAF to replace this one with if I indeed need to replace it?

clemson_tiger

Another update...after driving the car 30 miles the mpg is much better than usual on the same trip (I'm assuming because the MAF is screwed and the car is running lean). The car is again having the idle issue when stopped at a redlight but is running great when up to speed. MAF is around $285 at NAPA, which includes a $36 core charge. Thoughts?

splinter

An inexpensive OBD-II scanner/data logger (e.g., Equus 3160 Innova) will promptly pay for itself when chasing gremlins on these cars.
There’s scant rationale for pitching sound hardware during exploratory surgery.
Nevertheless, sounds as if your MAF may have already exceeded its useful service life. Good luck with it.

Some diagnostics if you haven’t already replaced it:

JonMBZ

Take the K&ns off it's not worth a few HP to destroy the MAF with those filters that spew oil into them.

clemson_tiger

So I've got a MAF on order and plan to put it on myself...should I disconnect the battery for a set amount of time to reset the computer? Will this also reset the check engine light?

ohlord

buy a Napa Maf use only oem. Call www.autohausaz.com or www.peachparts.com
You will regret otherwise.
Do not unhook the battery that will clear the code but not erase the stored codes in the ecu. Better to just install new unit and let it adapt the the ecu to the new range. Then the light will go out by itself.

clemson_tiger

Are you sure the light will turn itself out?

503C43 ////AMG

It will indeed as long as the problem is fixed. It wont turn off immediately but it will after some miles are put on it...

BHeart

Clemson Tiger,

I would agree with this 1,000% You definitely want to stick to OEM on these, and looking at the price you got quoted at NAPA you will probably end up cheaper going through the sources that "ohlord" posted.

clemson_tiger

Well guys, I went against your suggestion and went with the NAPA reman MAF. The unit is a Bosch reman that is made in Germany. Here are the specs:

Part Number: NEC XTP410104
Product Line: NAPA Reman. Computers
Attributes: Housing Included : Yes
Features and Benefits: Test 20 Different Points - 85% More Than OE - Based On Output Voltage Or Frequency Of Unit. Ensures Unit Will Not Cause Hesitation Or Stalling.
100% Computer Tested Under Simulated Road Conditions. Ensures Unit Properly Functions Under Real Life Conditions.
Direct OE Replacement. Ensures OE Fit, Form And Function.
Warranty: 12 Months/18,000 Miles, Replacement Will Be Issued for the Vehicle on Which It Was Originally Installed. Extended Only to the Owner of the Vehicle-Not Transferable. See Complete Warranty Statement for Details.


I worked for NAPA for a number of years through college and then some after and I'm a believer that many of the aftermarket parts meet or exceed OEM standards. In this case they claim it test 85% more "points" than OE. The part was $189 comparred to $350 at my local Mercedes dealer. It has a 12 month warranty so I think I'm good.

I installed the part last night...problem seems to be fixed! I'll update after a few days of driving!

ALLDATAdiy INFO

Give it a few drive cycles and you will be good to go!

clemson_tiger

Check Engine Light did indeed turn itself off! I put the new MAF on the car and drove it about 3 miles on a test drive and the car was running much better, problem solved. The next day I backed it out of the garage to wash it and then put it back in...it was at this point that I noticed that the CEL had already cut itself off.

If I have any issues with the NAPA reman MAF in the future I'll revive the thread and let the commuinity know...so far so good though!