The MAF issue you may not know about...

max69vk

Active Member
It's my birthday
Bit of a random one I know, but as this is an almost unknown issue that is such an easy fix, I thought it best to mention...

Now this issue predominantly affects TDI models, but also has the potential to affect petrol models as well, and specifically relates to the electrical plug connection to your MAF - Although any sensitive electrical component that relies on a multiple feed electrical signals can be affected.

A lot of people complain of issues of rough or lumpy running on their cars despite changing multiple parts and tuning etc (I was one of them). After months of tweaking & monitoring using VCDS I was still none the wiser as to why my car didn't feel quite right even after removal & replacement of parts including inlet manifold, EGR, and MAF.

Some late night reading lead me to investigate the MAF connector itself. Now the connector is a fairly robust item, nothing fancy, & typically standard of the type of connector used across the car - which is where the actual problem lies. Other than keeping the individual electrical contacts apart from each other, it contains absolutely no electrical insulation of any kind. Which means that connecting to such an electrically sensitive piece of equipment (MAF), the potential for cross signal or 'electrical contamination' across the plug connector is extremely high. It's these mixed or contaminated signals that cause the issues...

The resolution, costs around £3 & 5 minutes of your time... Simply remove the MAF connector, blow out any crud that may be inside, or give it a blast of contact cleaner if you have it. Now apply Dielectric silicon grease (It must be dielectric specifically) into the electrical contacts on the plug with your finger to fill the connections. Replug the connector & your done! I was a massive sceptic of this actually working, but unbelievably it has! My car is now has no more glitching or lumpiness, it's no more powerful, just super smooth. I'm now in the process of applying the grease to any other connections I can find in the engine bay (every little helps etc).

How it works: The dielectric grease is an electrical insulator, by filling the contacts you are ensuring that there is no electric/signal bleed across the connector & the only signal transfer can be from direct metal contact to metal contact. This ensures a 'clean' signal from MAF to your ECU & correct fuelling at all times.

This may not be the resolution to all of your issues, however for the money & time involved it should be a priority to investigate.
 

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DJ_26

Registered User
Interesting post, would like to see if this will make any difference to my car.
 

sliced

Drive safe, stay alive.
Do you just spread the grease in. How much do you put
 

S3Alex

Rarely neutral
Gold Supporter
Good tip....I think the connector and the wiring is a bit exposed and poor considering the cost.
Something like this could help a lot of us,and cost virtually nothing into the bargain.



The problem I had wasn't so much the connector,as the wiring getting fried.....but it also produced a loss in power.

 
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saq85

Registered User
Trying to get ahold of some of this stuff. It looks like its only available out of the UK, is there any shops that sell it over here? Maybe it has a diffent name?
 

LEE69

07 170 DSG
Trying to get ahold of some of this stuff. It looks like its only available out of the UK, is there any shops that sell it over here? Maybe it has a diffent name?
I can't see the link i put up :/ Search for
Permatex 22058 Dielectric Tune on amazon
 
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downtothebone

Registered User
I can't see the link i put up :/ Search for
Permatex 22058 Dielectric Tune on amazon
Bought the same on eBay ...
 

Rog_B

Registered User
Well I cleaned the MAF connector with contact cleaner and squirted the grease in the plug as directed. I did a few of those other connectors that I saw under the bonnet too at the same time. It started up OK so no harm done so far lol. I will take it out for a blast a bit later when roads are quieter.
I went through a massive flooded road last Saturday so some waterproof silicone compound on the electrics can't be a bad thing!
PS I am just bombing around in 3rd gear this week, getting the diesel level down so I can stick some Arachoil Turbo Cleaner in when it hits 15 or so litres, gives those vanes a good workout too.
 
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