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Old 8th August 2020, 09:21   #1
Arctic
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Default MAF Mod Diesel.

I think one or two of the members on the forum have at one time or another limped home due to the MAF.

The MAF can go out of range and then you lose power & have to limp home, not great if you are miles away from home or even on the motor way, this can be solved by unplugging the MAF.

The problem is getting to the MAF to unplug it as it, usually you would need to remove the air filter cover, that in it's self is a task if you do not have a 5mm long reach Allen key in the car with you.

This mod also helps if you have to change out the insert any time for a new MAF, it is a lot easier to change out the insert than take the whole MAF unit off the car.

To do this mod you will need a Dremel or similar make of the tool, all mark pen, couple of stainless steel screws, file, and a steady hand.

We are going to cut round the air filter cover around the MAF.

Lest start by marking with the pen Fig 1&2
1

2

Because i did this mod in situ i used a plate over the MAF plug/wiring so not to slip and cut into the plug or wiring, a 3mm drill bit is just right to cut through the air filter cover, always cut nearest the pen line that way you can tidy up later, or you could use a disc to cut the section out, i just find it easier to use a drill bit for cutting. Fig 3
3

Once you have cut through you can remove the section from that area. Fig 4
4

With the cut out section removed you can now tidy up the cut Fig 5
5

You now have good access to the MAF plug Fig 6/7
6

7

Now that you have access a pair of long nose pliers can be used to grab hold of the two clips on either side of the MAF these need to be pressed inwards, so the plug can be released Fig 8
8

With the clips pressed in the plug will lift off the MAF Fig 9
9

You can now see the two security screws holding the MAF insert into the unit Fig 10
10

The security screws are of the five point type and a nipple in the centre, you will need the tool to remove these Fig 11/12
11

12

The reason behind changing these security screws for a pozidrive stainless steel screw is it makes it easier to remove and add an insert if and when you need to. Fig 13/14
13

14

Do both screws Fig 15
15

I also heated up the ends of the spare long nose pliers i have to flatten the ends on them so they grip the MAF plug better. Fig 16
16

These will now be put in my little tool box in the boot so if my MAF was to ever go out of range and the car go into limp mode i could easy remove the plug and i would be able to drive home as per normal. Fig 17
17

You could also remove the MAF insert if like me you carry a spare MAF sensor and rectify it by adding the new MAF or a good in spec by just undoing the stainless steel screws most people carry a pozidrive in the car how many would have a five star security torx.

This mod would be easier to do if the air filter was taken off the car so next time you change your air filter maybe think of doing this little helpful mod cheers Arctic.
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Last edited by Arctic; 8th August 2020 at 14:46.. Reason: Photo Editing
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Old 8th August 2020, 10:46   #2
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Are the stainless steel screws to replace the ones holding the maf in place?

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Old 8th August 2020, 11:15   #3
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Are the stainless steel screws to replace the ones holding the maf in place?

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Yes because the original screws are 5 point security torx. Much easier with either a cross head or hex head screw.
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Old 8th August 2020, 14:58   #4
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Yes because the original screws are 5 point security torx. Much easier with either a cross head or hex head screw.

HI Dave
Spot on i had to go out earlier when i started the thread and have now only just got back in to finish it a little mod worth doing in my opinion.
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Old 8th August 2020, 15:16   #5
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Another worthy "how to", Steve, I've down loaded it but I think it should go in the appropriate "How To" section.

Nice one Steve,
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Old 8th August 2020, 23:00   #6
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Been running mafless remaps for 8 years now on my whole mg rover diesel range, can't recommend it enough!
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Old 9th August 2020, 11:02   #7
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Been running mafless remaps for 8 years now on my whole mg rover diesel range, can't recommend it enough!
Do you get much smoke going mafless? My ZR was running mafless and was very smokey and not great on fuel.
Took it to CJL in Spalding and he remapped it with a switchable MAF and even when the MAF is in it's more powerful and fantastic on fuel.
I understand we can't have switchable MAFs on the BMW diesel
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Old 9th August 2020, 11:11   #8
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Originally Posted by Russp View Post
Do you get much smoke going mafless? My ZR was running mafless and was very smokey and not great on fuel.
Took it to CJL in Spalding and he remapped it with a switchable MAF and even when the MAF is in it's more powerful and fantastic on fuel.
I understand we can't have switchable MAFs on the BMW diesel
I was about to ask something similar.
I had my ZT "read" at one of the Nano's and I was told the MAF isn't doing what it's supposed to, but ( I'm sorry about this, I'm rubbish with names) I was told by a very nice guy that he could remap for me and I wouldn't need to buy one.
My car has started to feel very sluggish, so I'm thinking of a remap soon.
If I can get away without buying a MAF and just have the remap, brilliant, but I dont want loads of smoke.
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Old 9th August 2020, 11:46   #9
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Been running mafless remaps for 8 years now on my whole mg rover diesel range, can't recommend it enough!
Wait, someone on here also trusts a mafless remap!? Be careful, you'll be told off!!

Quote:
Originally Posted by Russp View Post
Do you get much smoke going mafless? My ZR was running mafless and was very smokey and not great on fuel.
Took it to CJL in Spalding and he remapped it with a switchable MAF and even when the MAF is in it's more powerful and fantastic on fuel.
I understand we can't have switchable MAFs on the BMW diesel
Depends how much you want it pushed, if you want it pushed to max torque you'll have an occasional puff of smoke on a full throttle launch before the turbo has spooled up.

The fuelling can be set to not smoke, you'll just lose a bit of torque, not a huge amount. You'll get about 300lbft with no smoke, and be pushing 320-330lbft with a bit of smoke on full throttle. Quite an increase over the 220lbft stock torque . In NM thats roughly 400/450nm. The torque increase is what you really feel with a remap.

One huge bonus is never having to worry about the MAF again, if you have a good MAF you can still have the same map. But when your MAF fails, simply unplug it and forget about it
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Old 9th August 2020, 12:23   #10
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Originally Posted by Jamiewelch View Post
Wait, someone on here also trusts a mafless remap!? Be careful, you'll be told off!!



Depends how much you want it pushed, if you want it pushed to max torque you'll have an occasional puff of smoke on a full throttle launch before the turbo has spooled up.

The fuelling can be set to not smoke, you'll just lose a bit of torque, not a huge amount. You'll get about 300lbft with no smoke, and be pushing 320-330lbft with a bit of smoke on full throttle. Quite an increase over the 220lbft stock torque . In NM thats roughly 400/450nm. The torque increase is what you really feel with a remap.

One huge bonus is never having to worry about the MAF again, if you have a good MAF you can still have the same map. But when your MAF fails, simply unplug it and forget about it
I think you may have been the man I spoke to months ago ?? Is it your good self that does the remaps?
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