vRS 2.0T FSI - Stuttering at idle and on acceleration up to 2000 rpm...

[R8MXX]

I have a 2006 Octavia vRS with 101k on the clock running the 2.0T FSI engine.

Just went in for its service with a local VAG specialist (Wagen Worx in Burnham-on-Sea - if anyone is in the South West this guy is fantastic!). I asked him to look at the hesitation issue we had been fighting with for the last few months in more depth while he had it for the day as he was convinced it was just me being 'anal'.

It seems to happen on idle and you feel the revs dropping and increasing by probably only 100rpm but enough to put a vibration through the car, then on driving up to 2000 rpm on light throttle you get a similar stutter. I have also had it stick on revs really badly if I am on a long journey had cruise set for 20 minutes or so and then try to accelerate and it stutters all the way up to just past 2000 rpm and then its smooth as anything.

In the past few months we have replaced/tinkered with the following items:

New PCV valve and full test of the EVAP system - no errors.

Removal of remap from previous owner as was not correct (no torque mapping and engine timing retarded) and put back to standard map.

Removal and Clean of Throttle Body then re-adapted to the engine - no errors.

None of the above has made any real difference. The car is always run on super unleaded (normally tesco 99 or sainsburys 97).

Yesterday, as a test we unplugged the inlet manifold flap motor from the car and the problem has seemed to have gone away to a certain degree although the issue is still there on idle but not through the bottom of the rev range.

Before I take the plunge and either buy a new motor, or buy the APR flap delete kit and have the flap system deleted from the map does anyone have any further ideas what could be causing this?

Thanks in advance

[blueR36]

Have the coil packs been replaced in the coil pack revision http://www.briskoda.net/forums/topic/197957-coil-pack/

[R8MXX]

Coilpacks were replaced a couple of months before I bought the car by the previous owner trying to resolve this issue. Have the Skoda receipt. Was part of the reason I got the car cheap!

On the common engine issues thread for the 2.0T FSI this flap motor is No. 7 - so it could well be it...

Edited 18 April, 2013 by R8MXX

[07 vRS Taxi]

Mine also does this but with the poor weather, full time work and full time education I havn't managed to solve it...yet.

[R8MXX]

Mine also does this but with the poor weather, full time work and full time education I havn't managed to solve it...yet.

Will let you know how I get on - I am leaning towards getting them out totally. Seem to be a weak part of the engine and just block air flow...

[vrs777]

Just to throw a spanner in. I changed 4 coil packs on mine, only for 1 to give up after 2000 miles. Replaced and drives fine again, but coil packs failing give really obvious symptoms.

[07 vRS Taxi]

Thanks! I wouldn't remove the flap motor mate it helps direct the air, aiming it at the piston swirl chamber near TDC whilst in stratified mode it's the way the TFSI is engineered. I know my motor

is ok I have no fault codes and the basic setting was performed by VCDS OK.

[R8MXX]

I have watched my motor moving of its own accord on idle.. So know its something to do with that motor although nothing is coming up on VCDS.

Due to cost, i will be getting a new motor and not going down the removal route just yet!

[07 vRS Taxi]

Ah fair enough mate, did you check the misfire counters?

I have multiple misfires on all cylinders at idle but not underload. I've also checked fuel pressure that's OK though.

[martziniuk]

I'd guess at a coked up inlet manifold.

[07 vRS Taxi]

I'd guess at a coked up inlet manifold.

yeah im leaning towards an intake fault but all is good under load, ill do a compression test anyway..

[R8MXX]

yeah im leaning towards an intake fault but all is good under load, ill do a compression test anyway..

Same as me, under load is all fine. Which points to the issue of the motor/flaps really.

If you look at the image I have attached it shows you when the tumble flaps should be shut and when they should be open. So basically on light throttle and idle (low engine power) they should be closed, then when you increase throttle they open.

As I said when my car is held at a steady 1500rpm (by a MOT testers bar!) the revs move 100rpm (ish) up and down then when you go and look at the flap motor you can see it moving backwards and forwards about 1mm....

[R8MXX]

Also I have found the motors can be bought for about £50 less than VW/Skoda from VDO's distributors in the UK.. Called them yesterday and they work out at £130 delivered direct from Germany in 3 days. Skoda and VW both said £180 and 3 days to get one.

Just have to work out tonight whether I need the revision or non-revision type. Will have to get in the engine bay and have a look at the part number on the end of mine!

Edited 19 April, 2013 by R8MXX

[07 vRS Taxi]

On my last MOT the tester couldn't keep the RPM steady enough he said he had to set the machine as if it was a 5 cylinder to get a good reading. It misfires that bad sometimes I can hear it popping when I stand at the exhaust. I see what you mean they shouldn't move at low RPM I can't remember the part number of mine but I did check it once and it isn't the revision, they will only send you the revised part. Let me know how you get on mate.

Edited 19 April, 2013 by 07 vRS Taxi

[R8MXX]

Mine is not a misfire as such, more of a stutter... and certainly not as pronounced as yours! As I said it only moves by +/- 100rpm (ish). But still enough to be annoying!

Reading on the Audi forums for this issue if you have the motor with a letter on the end of the part number then you can have the latest revision (Ending in E).

However, if the part number does not end in a letter you need that exact one otherwise when you go to complete basic settings on it it will fail. Someone on there was supplied a revised part by the Audi dealer (as that is what their system suggested!) and it would not program in. Apparently the non-revised part (without a letter at the end) is more expensive - will find out after work what mine is and get on the blower to the dealer again.. Ideally I will try and but it direct from VDO and save a few pennies...

Edited 19 April, 2013 by R8MXX

[omendamo]

Edit: sorry wrong post!

Edited 19 April, 2013 by omendamo

[R8MXX]

The 2.0 TFSi I am running in the vRS is a different animal to your 1.6 FSi.. although it probably uses a similar inlet manifold flap system. I would say your issue is with the engine being a bit underpowered for the size of the car and occupancy seems it only happens when you are loaded up.. My issue is happening all the time.

I would say the fuel economy is probably about right. Stop/Start town driving in the 2.0T FSi i get about 28/29mpg.

Could be worth having the inlet manifold flap motor looked at by a VAG specialist thou as it could be a similar issue...

[Striding Edge]

Hi R8MXX,

It sounds like I have the same issue as you (2007 2.0 TFSI with 106k on the clock) stuttering on idle when cold and hesitation from low revs but seems to clear at higher rpm. Once the engine's warmed through it's fine.

I've been trying for months to diagnose and fix but as yet no luck. I'd be very interested to hear how you get on.

My history if it's useful to you:

> Originally diagnosed as a defective intake manifold (£834.60 fitted) at a Skoda main dealer.

> Second opinion at another main dealer disagreed with this as the cause, and pointed to "incorrect purge flow".

> Wiring checks all ok

> Split breather hose replaced.

> EVAP Systems and Charcoal filter checked out ok.

> Dealer removed connecting hose for pressure valve N80 and manifold pipes, cleaned, reassembled and leak checked - all ok.

> Faults cleared but came back with P1337, P0642, P1643 and P0441.

> Dealer removed throttle body and cleaned throttle body flap of carbon deposits.

> I've tried Ferme Fuel System Cleaner (on dealer advice) and a Seafoam treatment.

> Coil packs have also been changed.

Good luck.

[martziniuk]

Hi R8MXX,

It sounds like I have the same issue as you (2007 2.0 TFSI with 106k on the clock) stuttering on idle when cold and hesitation from low revs but seems to clear at higher rpm. Once the engine's warmed through it's fine.

I've been trying for months to diagnose and fix but as yet no luck. I'd be very interested to hear how you get on.

My history if it's useful to you:

> Originally diagnosed as a defective intake manifold (£834.60 fitted) at a Skoda main dealer.

> Second opinion at another main dealer disagreed with this as the cause, and pointed to "incorrect purge flow".

> Wiring checks all ok

> Split breather hose replaced.

> EVAP Systems and Charcoal filter checked out ok.

> Dealer removed connecting hose for pressure valve N80 and manifold pipes, cleaned, reassembled and leak checked - all ok.

> Faults cleared but came back with P1337, P0642, P1643 and P0441.

> Dealer removed throttle body and cleaned throttle body flap of carbon deposits.

> I've tried Ferme Fuel System Cleaner (on dealer advice) and a Seafoam treatment.

> Coil packs have also been changed.

Good luck.

Do you have vcds?

If so log your car for misfires (it counts them) when the hesitations occur.

[blueR36]

Did you get this sorted?

[R8MXX]

Did you get this sorted?

I have the new motor/actuator direct from VDO in Germany sat in its box waiting for the 18th May to come for it to be fitted by my VAG specialist - I went to do it myself and it is surrounded by a dozen pipes and wires and didn't want to cause myself further costs by breaking something so thought I would leave it to the pro! Especially as it has to have basic settings run on it and I don't have a VCDS to do it with.

Will post an update on the 18th once its all done....

[blueR36]

I had the tumble flap motor go on mine a couple of times but resetted it with vag com

[R8MXX]

I had the tumble flap motor go on mine a couple of times but resetted it with vag com

Tried Basic Settings on my current one and no change.. Seems like there is a weakness in the motor hence shelling out for the new one...

Edited 9 May, 2013 by R8MXX

[07 vRS Taxi]

It's strange mine is really bad at times but whenever I plug it into VCDS it typically runs well!

[blueR36]

Shame it was not a cheap fix good luck mate