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calumcousins

how can you tell if your MAF is shafted?

13 posts in this topic

Begginning to think that mine may have gone recently, since i seem to be experiencing problems similar to those I read in a post a while ago (ie: car makes all the right noises but just doesnt seem to be going as fast as it used to...)

smashfreakB.gif

is there any easy way of checking if its fooked or not? or is there a way of rectifying it without replacement, like using a bit of contact cleaner on the sensor or something??

Thanks,

Calum.

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The Vw technican that looked at mine just pulled the plug out and i took it a quick spin down the road noticed the difference straight away then just plugged it back in an ordered one up 169144-ok.gif

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Dubz...oddly not...

One of my mates had a scooby STi which apparently is also prone to probs....one of the ways to test apparently is to disconnect while the engine is running and see if it makes a diference.

When the MAF is disconnected the ECU apparently switches to a default map of some sort as it can no longer analyse the airflow....

If the MAF is connected but giving duff info, then the ECU will use the standard map and probably not be anywhere near accurate as the amount of air in won't be correct...

Overall, the car runs better with no info rather than crap info smile.gif

At least thats the way I understood it...

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[ QUOTE ]

What is the MAF?

[/ QUOTE ]

Commonly known as the Air Mass Meter. Do a Google & fill yer boots.

169144-ok.gif

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[ QUOTE ]

What is the MAF?

[/ QUOTE ]

It measures how much air is being sucked in through the inlet system and sits in between the air filter and the intake manifold.

There is an electronic sensor which does the measuring and this is the widget that goes Pete Tong. VW only do a replacement for the whole unit, not the sensor itself.

When it goes wrong, the engine management system doesn't know how much air is going in, so can't adjust the fuelling correctly, so your car will run anything between slightly down on power to a complete box of spanners.

9 times out of 10, replacing the MAF sensor will fix poor running problems on any VW/Audi/SEAT/Skoda.

HTH

beerchug.gif

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righto, i'll give this a go then (unplugging and going for a spin).

Just to double check, the plug im ripping out (if my memory serves me correctly) is the one half way along the tube between the air box and the engine intake, right?

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Yup. Here's a pic of the MAF sensor removed from the car. On the R32, it's screwed directly into the air filter housing. Just be careful how you take it off so you don't damage the plastic clips on the plug...

572187-maf-sensor.jpg

post-8816-137914328941_thumb.jpg

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Did i read right in another thread that u can simply remove these and replace urself? do u not need to reset any ecu codes or "adaption" or something? if its just a driveway simple swap then that'll save us all £££ in vw labour. My local breakers yard has loads of mk4 golfs and seen two decent conditioned maf's still in them!

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Welcome to Tyresmoke Jon (if you've not already been welcomed!) 169144-ok.gif

[ QUOTE ]

My local breakers yard has loads of mk4 golfs and seen two decent conditioned maf's still in them!

[/ QUOTE ]

Not all MAFs are the same - the electronic sensor is different and the housings are different diameters, depending on the car it's fitted to. They are only £75 + VAT new, so this would be your best bet. The part number for the MAF is on the side of the housing. VW dealers keep most in stock - except the R32 crazy.gif

You can just do a straight swap with the replacement, although, if there is a fault registered on the ECU, you will just need to get the fault reset using VAG-COM at your friendly local VW specialist.

HTH

beerchug.gif

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Just took my car into the main dealer today. The EPC light and Traction Control lights illuminated on the dash. They have confirmed that the MAF sensor is playing up. They have ordered a new one for me to be fitted later this week.

I had the 6463 update done over a year ago. I fitted a K&N induction kit about 4 months ago but took it off fearing for possible problems with the MAF. Looks like the damage was already done, obviously I cant say the K&N was responsible. Dont think I'll be putting it back on though!

I had noticed that the car was starting to feel like pre 6463 update with a fecked MAF and getting gradually worse.

Cant wait to drive a smooth R32 again! smile.gif

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