Noticable lag on acceleration

KevinST · Dec 13, 2002

Doesn't happen all the time, once or twice a week I'll put my foot down and the car seems to hang onto the same RPM for about a second and then accelerates as normal. Happens more when it's cold outside as well.

I've had this for about a year now, maybe more, and everytime I take the car to a dealer I ask them to look at the DV and Air Mass Meter. Every time they either replace the DV (but the problem is still there) or say they can't find any faults.

Same again today - can't find any faults sir, nothing in the fault log.

I'm 90% convinced it's the Air Mass Meter - others have reported similar symptoms which have been fixed when the AMM was swapped out... even the dealer says that the AMM can be faulty but won't show a fault in the fault log!

I asked today if they could just swap it out - no, can't do that as Audi test all returned components and will charge the dealer if they don't find a fault (yeah right - I'm sure they do).
Asked if I tookthe car to AMD and they diagnosed a faulty AMM, would Audi refuind my AMD costs?? No.
So how much is a AMM (thinking I'll buy one and fit it myself) - Â£190 (think that's ex VAT as well).

Bah. So, in an effort to stop this post being a flame-room candidate... is there anything I can do to the AMM to fix it?? could it just be dirty and a clean would help?

^outt^kast^ · Dec 13, 2002

Somebody else suffering from this problem did actually report that cleaning the AMM solved it for them, so might be worth a try.

Personally I had mine Replaced.

Kast^

jgoodman00 · Dec 13, 2002

I reckon the same is true of my car actually. It definitely has a lag on acceleration, but I just put it down to turbo lag, compared to my V6 golf.

I am going in tomorrow, I will ask them about it...

ADB · Dec 13, 2002

So how do you clean it then? More to the point where is it (he says creeping away waiting to be stoned...) :-/

Andy

pas_55 · Dec 13, 2002

Same as that.Anyone know how you clean the AMM?

Guest · Dec 13, 2002

Is the AMM not self cleaning. Only one I have actually physically seen in the flesh was a ford one and they are self cleaning. They actually heat up like a cigarette lighter coil when the diagnostics are carried out upon ignition. This burns off any residues that may affect its function.

artthur · Dec 13, 2002

KevinST,

This does sound like the MAF (as Audi prefer to call it)

You can try to clean it, but I cleaned mine and did not improve the situation. It is found in the pipework on the engine side of the intake system immediately after the air filter (so RHS side of the engine bay, just to the left of the air filter housing)As usual it is a little black plastic gizmo with a fiddly connector and a couple of wires attached.

Be careful if you do take it out to be cleaned, because they are VERY FRAGILE. I understand the active part of the meter is a filament, but I couldn't find one on mine - maybe it burnt away.

When mine had gone the car was a pig on cold days, was difficult to change gear smoothly and gave a noticeable lag followed by a huge burst of power at about 4,000rpm - I thought it was my driving (as if!!)

A faulty MAF does not show up on any fault logging system if it fails the way mine did. When failure occurs, the engine management system uses a default set of parameters to run the engine, which are close enough not to notice it too much unless like me you are pedantic about "feelings" The car will run with a faulty one for a long time - in fact I bet for ever.

Mine was diagnosed by a consciencious Audi technician and when the new one was fitted, the car was transformed back to its former glory.

Hope this helps.

arTThur.

Noticable lag on acceleration

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