Faulty AFM - Signs ?

[Jasdent]

Alright ? seem to have a lot of questions needin answered !

S3 is supposed to be 265hp but doesn't feel like it. I understand that the AFM are supposed to be a common fault on these cars, what's the best way to confirm a fault in the AFM ?

cheers,

G.

 

[Jasdent]

Nobody able to help me with this ?

 

[jojo]

AFM is called a MAF on your Audi, a faulty one would make your pewerdelivery uneven, like the power is coming on and off throughout the rev range, or you may get the 'V-Tec' effect, where the power delivery comes in 2 stages at around 4k revs, this would suggest a intermittent MAF problem. f it's totally ******, it will feel like the engines holding back when you give full throttle, the power seems to be there, but it won't unleash itself.

 

[DavidR]

Best solution is to find one that works (off another car / new one) and swap them over. Reset the ECU and try the car again.

If you have VAGCOM you can plot actual vs command boost pressure - if command is much higher than actual the MAF can be suspected.

 

[Jasdent]

Yeah, I am thinking I have problems with it then. The car can quite often caomes and goes when I am accelerating and also get a choke effect when I stick the foot down.

Anyone know the best place to get a new one at a decent price ? someone was telling me they quite often come p/xchange for the old unit, is this true ?

Also is it just a case of changing it and everything should be fine ?

cheers guys, lot of help !

G.

 

[jojo]

£80 exchange from your local Audi stealership bud, or just buy the sensor part from GSF parts for 55 quid or so, and you need a star bit to take the old one off.

 

[DavidR]

Ebay, VAGPARTS, Eurocarparts etc...

Change it (you'll need a fancy hollow torx bit for the newer cars), reset the ECU (pull the fuse or disconnect battery) and it should be fixed if the Maf was at fault.

 

[Jasdent]

Perfect, cheers very much guys !

any benefit in replacing the whole unit to just the sensor part ?

 

[rodenal]

no point replacing the whole unit mate, sensor will do yo ufine

 

[Lord Vader]

Do you have to reset the ecu, as i changed mine recently and suspected the new one to be faulty as when you reved the engine and allowed the revs to fall, it would try to stall , but then sort itself out. So i sent it back.

Should i have reset the ecu and if so will this mess up any of the other settings in the car?

Thanks

 

[jojo]

No resetting needed, it's plug and play