MAF DIY PICTORIAL: replacing/cleaning - Mercedes-Benz Forum
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#1 (permalink) Old 07-09-2007, 09:07 AM
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Post MAF DIY PICTORIAL: replacing/cleaning

Okay, folks, clearly I was thinking of all of you while I was on vacation.

Attached is the PDF version of the MAF R&R process.

The end of it also includes a section on cleaning the MAF sensor.

Send your checks to World Vision.

And as always, take care and enjoy the ride!
Greg
Attached Files
File Type: pdf MAF.pdf (715.4 KB, 22918 views)

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#2 (permalink) Old 07-09-2007, 09:21 AM
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great job greg.
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#3 (permalink) Old 07-09-2007, 11:12 AM
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Thanks Greg, I just added this to our DIY section.

http://www.benzworld.org/forums/w210...7-07-07-a.html

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#4 (permalink) Old 07-11-2007, 06:09 PM
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Greg,
This is a good one. I think I'm not the only one that cleaned the wrong part of the MAF - namely the more visible wire with the resistor on. I'll clean it out in the right place and try it again.
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#5 (permalink) Old 07-12-2007, 08:33 AM
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Thanks Greg, I purchased the cleaner but I have heard if no codes come up not to touch it. So I will hold on to the cleaner with hopes never to use it but if I have to I have it on hand. What are the differences one feels when replacing or cleaning MAF?
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#6 (permalink) Old 07-12-2007, 08:58 AM
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Originally Posted by slybydesignw210
Thanks Greg, I purchased the cleaner but I have heard if no codes come up not to touch it. So I will hold on to the cleaner with hopes never to use it but if I have to I have it on hand. What are the differences one feels when replacing or cleaning MAF?
Hey, Sly.

Throughout the myriad MAF threads I've tried to stress that there often are no symptoms of a failing MAF beyond a trouble code or CEL (a "fault condition"). Since in my experience cleaning resolves something less than half of MAF issues, cleaning an MAF following a fault condition -- if contamination was not the cause -- will result in no difference to the driver.

However, when the MAF is dirty and that triggers the fault condition, then cleaning it will restore some amount of driveability, fuel economy, emissions control and performance.

The same holds true when the fault condition is unrelated to contamination and the MAF is replaced: the driver may sense some additional performance, throttle response, smoothness, etc.

For a good one look down in the sensor source thread, an oil driver changed his MAF and immediately noticed an improvement in driveability, smoothness, performance, etc.

As you know I recently replaced my MAF (after cleaning attempts failed to clear the code) and I've yet to notice anything. Sometimes I think it has a bit better throttle response and shifts perhaps smoother, but that's just as likely to be a psychosomatic response (basically, I changed it, so I think I notice something).

Bottom Line? You may not notice any difference after replacing or cleaning a MAF, but at least you'll know you've restored your car and it's emissions systems to proper working order. And your gaze won't be constantly drawn to the CEL.

Take care and enjoy the ride,
Greg

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#7 (permalink) Old 07-12-2007, 10:51 AM
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I would like to hear success ratio in MAF cleaning. I had 2 MAFs going bad on my cars and I've got 2 more from somebody else. All of them passed visual inspection as being perfect with no signs of dirt or damage. I sprayed them all with MAF cleaner to come to ZERO success rate.
Am I in bad luck?
Edited for spelling correction

Last edited by Kajtek1; 07-12-2007 at 11:37 AM.
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#8 (permalink) Old 07-12-2007, 11:21 AM
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Originally Posted by Kajtek1
I would like to hear sauces ratio in MAF cleaning. I had 2 MAFs going bad on my cars and I've got 2 more from somebody else. All of them passed visual inspection as being perfect with no signs of dirt or damage. I sprayed them all with MAF cleaner to come to ZERO success rate.
Am I in bad luck?
Hey, Kajtek1.

I think you're just seeing reality. For the stories of success I hear relative to MAF cleaning, I hear far more that it doesn't do anything. For domestic brands it seems to work more often, but even then it's probably only around 50% success rate.

With all your MB's you're the perfect candidate to buy the sensor inserts. Maybe Ron at GermanStar will give you a quantity discount.

Take care and enjoy the ride,
Greg

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#9 (permalink) Old 07-12-2007, 12:59 PM
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Thanks for the write up Greg.
I will try this the next time I get the CEL for MAF.
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#10 (permalink) Old 08-12-2007, 10:07 AM
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My experience: the torx screw has a little protruding index at the center. I bought a set of tool from eBay, but found out that they don't work with this type of torx screw and ended up having to go to Pepboys to buy another set.
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