A3 2.0t fluttering / surging at idle

[German Dreams]

So the car is surging at idle really bad sometimes when you pop the throttle and let it return to idle it will actually shut off.

Sometimes huge loss of power IE limp mode Sometimes seems fine

Changed diverter after it was checked and obviously bad
changed pesky pcv valve that was leaking and she seemed to idle a little better and run better
pulled Maf sensor plug and surging went away but with new maf sensor problem seems to be the same
no vacuum leaks i have been able to find
Also trans shifting funny (Automatic) if there is something vacuum related between the two that can be checked?

Any help??? search didn't provide much but if someone can link me somewhere to start that would be helpful

[BrandonF]

Is you check engine light on? Have you checked your coil packs?

[German Dreams]

no check light at the moment
yes its misfiring some but not enough especially with what else its doing to make me think coil pack
why would a coil pack cause a surge in the vacuum signal and make me here turbo spool???
will test drive again shortly and see if i can pull some codes

[BrandonF]

Should have asked what year your car is too, FSI or TSI? The only other thing i can think of is the Cam follower... Not sure if thats the problem...


Anyway check out this forum for answer on all your technical needs

http://forums.vwvortex.com/forumdisp...I-Engine-Forum

[German Dreams]

06 fsi a3
if i pull the mass air flow sensor it smooths right out

aprox 80,000 on the odometer

[tpliquid]

what does vag com say?

[German Dreams]

nothing right now other then a loss of power to mass air flow when i pulled it. pulling it out to try to get more codes

[BrandonF]

06 fsi a3
if i pull the mass air flow sensor it smooths right out

aprox 80,000 on the odometer

Sounds like you solved your own problem... Busted MAF sensor could explain your situation(if the sensor was acting all weird it could change up the ratios and mixtures and have the car idle funny, i'm not a mechanic though...).


EDIT: nvm... I just re-read your first post. Is the problem intermittent? It sounds like an electrical problem now...

[TurboKits.com]

If you are having issue like you explain and they immediately go away when you unplug the MAF. It is almost always a leak in the charge piping. When you unplug the MAF the ECU defaults to the "safe my but mode" which does not rely on the MAF signal to run, so it smooths out. When the MAF is installed, the ECU is seeing one signal, but fueling for a different one (air leak letting in unmetered air). Then the STFT (fuel trims) are going nuts trying to compensate which is why you get the unstable idle. I would run a pressure test from the intake and see what hisses at you...

If the MAF was truly bad and causing these issues it would have already thrown a code for it.

nothing right now other then a loss of power to mass air flow when i pulled it. pulling it out to try to get more codes

[German Dreams]

Drove car bucking and jerking all over the place shifts funny comes in and out of power. if you step on it boosts to 10 psi so pressure side and turbo seems good
rechecked with vag-com no codes other then the maf one from when i disconected it

[German Dreams]

problem not intermittent

but new mass air flow did nothing

[German Dreams]

If you are having issue like you explain and they immediately go away when you unplug the MAF. It is almost always a leak in the charge piping. When you unplug the MAF the ECU defaults to the "safe my but mode" which does not rely on the MAF signal to run, so it smooths out. When the MAF is installed, the ECU is seeing one signal, but fueling for a different one (air leak letting in unmetered air). Then the STFT (fuel trims) are going nuts trying to compensate which is why you get the unstable idle. I would run a pressure test from the intake and see what hisses at you...

If the MAF was truly bad and causing these issues it would have already thrown a code for it.

SO before or after the turbo??????
whats the easiest way to pressurize the system??? Just rag and air hose at the intake pipe????

[Turbo Nerd]

Spray some brake cleaner around your piping should be pretty easy to find your leak. If you put on boost hoses in the past I would check those connections also check for tears, but brake cleaner is safe to spray around your charge piping. Hope this helps good luck.

[TurboKits.com]

Since you are looking for a leak after your MAF, it would have to include the MAF pipe as well. Try to find a local shop that has the adapter to put pressure in the piping. It's a plastic round cylinder that has an air hose fitting on it. You use this with compressed air, adjustable valve and pressure gauge (you don't want to go over what the turbo would produce). I see you are in Cali or I would have you stop by to see us... Hope this helps.

Thanks

SO before or after the turbo??????
whats the easiest way to pressurize the system??? Just rag and air hose at the intake pipe????

[German Dreams]

Spray some brake cleaner around your piping should be pretty easy to find your leak. If you put on boost hoses in the past I would check those connections also check for tears, but brake cleaner is safe to spray around your charge piping. Hope this helps good luck.

Tried this first with no luck

[German Dreams]

Since you are looking for a leak after your MAF, it would have to include the MAF pipe as well. Try to find a local shop that has the adapter to put pressure in the piping. It's a plastic round cylinder that has an air hose fitting on it. You use this with compressed air, adjustable valve and pressure gauge (you don't want to go over what the turbo would produce). I see you are in Cali or I would have you stop by to see us... Hope this helps.

Thanks

will try this today

[Nzila8]

Did you get it fixed?

[BLK-N-YTEaudiA3]

I had the same problem. Well generally the same. look into the IMRC motor, Intake Manifold Runner Controller. It controls the flaps in the intake manifold for the amount of air that goes into your engine. You will need a VAG after it's installed but I guarantee that will fix the problem.

[b8ascrub]

You might want to look at your coils. There is a newer revision out. I changed mine and the idle is much smoother now.

Sent from my SPH-D710 using Tapatalk 2

[tizzie1980]

I have an audi a3 2006 2.0L AND THE ENGINE LIGHT IS ON AND WHEN I START THE CAR IT MAKES A LOUD NOISE I NOTICE THE IDLE IS HIGH DO YOU KNOW WHATS WRONG CAN YOU HELP ME PLEASE?

[Tenedorr]

Was there a resolution to this? I'm having similar problems.