No low end torque - Audi A4 2.0TDi

[Gino1001]

Hi guys,

I have the Le Mans that's known for its horrible lag; I bought mine second hand and also thought that the vanes might be stuck. So, after alot of researching and replacing quite a few parts (mostly under FWP), my lag is finally gone.

Although replacing the EGR valve was worth it in terms of smoothness, the two things that really made all the difference was:
1. Replacing the boost pressure sensor &
2. Software - tuner was able to shift the torque band by a couple of 100 rpms which means no lag in any gear through most of the rpm range.

Just my 2c

Thank you for the input, I have had my car at a guy that is a mechanic at Audi, he recommended me to check the cam timing and EGR valve. My car is going in for cam belt service on the 2012-10-22, so all this will be checked and hopefully it all will be sorted. Viper please be on standby, we gonna need some parts... lol

Will see what the conclusion is and give you guys some feedback.

Sweet, keep us updated.

[Gino1001]

Hi guys,

I have the Le Mans that's known for its horrible lag; I bought mine second hand and also thought that the vanes might be stuck. So, after alot of researching and replacing quite a few parts (mostly under FWP), my lag is finally gone.

Although replacing the EGR valve was worth it in terms of smoothness, the two things that really made all the difference was:
1. Replacing the boost pressure sensor &
2. Software - tuner was able to shift the torque band by a couple of 100 rpms which means no lag in any gear through most of the rpm range.

Just my 2c

I don't believe you can ever get rid of lag completely, you can improve it but due to the fact that you have to get the turbo up to its optimum rpm when going from off throttle back to on, lag will never be completely over come...

Ok, so completely might not have been the right word to use, but its 200% beter than what it was.
My car used to stall quite easily on pull-off but now I no longer have to give a bit of gas when pulling off slowly.
The worst was taking a turn and having to go down to 2nd gear especially if there was a bit of an incline, it would go nowhere veeeerrrrryyyy slowly.
On cold/chilly evenings, acceleration is instant - might be the software

[eliasTDI]

Just want to say thanks to those that helped!

managed to get Glow Plugs from Goldwagen at R219 each

car will be back in my hands tomorrow

Great service from Goldwagen contacted them last week said they didn't have but today they phoned me back and got them in for me

[Neuk]

Hi guys,

I have the Le Mans that's known for its horrible lag; I bought mine second hand and also thought that the vanes might be stuck. So, after alot of researching and replacing quite a few parts (mostly under FWP), my lag is finally gone.

Although replacing the EGR valve was worth it in terms of smoothness, the two things that really made all the difference was:
1. Replacing the boost pressure sensor &
2. Software - tuner was able to shift the torque band by a couple of 100 rpms which means no lag in any gear through most of the rpm range.

Just my 2c

I don't believe you can ever get rid of lag completely, you can improve it but due to the fact that you have to get the turbo up to its optimum rpm when going from off throttle back to on, lag will never be completely over come...

Ok, so completely might not have been the right word to use, but its 200% beter than what it was.
My car used to stall quite easily on pull-off but now I no longer have to give a bit of gas when pulling off slowly.
The worst was taking a turn and having to go down to 2nd gear especially if there was a bit of an incline, it would go nowhere veeeerrrrryyyy slowly.
On cold/chilly evenings, acceleration is instant - might be the software

Cool, but, the highlighted part isn't lag, that's boost threshold The gearing down you described would be lag...

[Gino1001]

Thanks mr Neuk

[Neuk]

Thanks mr Neuk

:high five:


Sent from my iPhone 4 using Tapatalk

[eliasTDI]

Thought i'd update you guys

got my car back , new glow plugs in

and no lights are appearing on my dash so looks like it was the Glow Plugs ,very odd thing to cause such a thing

well yeah now its back to normal will fill up soon and keep T@nk updated on how many km's i get

[Neuk]

Thought i'd update you guys

got my car back , new glow plugs in

and no lights are appearing on my dash so looks like it was the Glow Plugs ,very odd thing to cause such a thing

well yeah now its back to normal will fill up soon and keep T@nk updated on how many km's i get

Great success

[T@nk]

Hi guys

Would just like to inform you that my Audi is going like a dream again. The mechanic told me that when he put the new cam-belt on he adjusted the pulley's so they are aligned again. I still have a-bit of a dead spot at low end, but it starts to push you into the seat from about 1500 rpm. Very happy...

Thank you for all the help and advice.

Now I just want to take it to Revo to get the software done...

[Neuk]

Hi guys

Would just like to inform you that my Audi is going like a dream again. The mechanic told me that when he put the new cam-belt on he adjusted the pulley's so they are aligned again. I still have a-bit of a dead spot at low end, but it starts to push you into the seat from about 1500 rpm. Very happy...

Thank you for all the help and advice.

Now I just want to take it to Revo to get the chip software done...

Good to hear, boosting from around 1500 rpm is on the low side but n0ot abnormal on a TDi...

[Tdi jetta 4 ever]

So with other words the timing was a bit out?

[T@nk]

Jip... But he said it wasn't out by a lot.

[Tdi jetta 4 ever]

Great, glad you came right.

[Neuk]

Jip... But he said it wasn't out by a lot.

Won't have to be out by a lot to have a noticeable effect. Many forget that timing in a TDi is massively important, especially fuel injection timing...

[Gino1001]

Glad you got sorted T@nk; its actually good to know as I also need to replace my cam belt in the next couple of months.

[Rezizter]

this is how the vanes work



check for the linkages around the turbo and make sure there are no vacuum leaks or loose conectors (I don't know if the 2.0Tdi VGT is vacuum or electrical operated)

If you can get access, spray the outside of the turbo where you can see linkages thoroughly with tool-in-a-can/wd40/q20.

Leave overnight. The next day you wash off the residual oil with warm soapy water.

Chuck a 250ml 2SO (2 stroke oil - it burns away carbon deposits at low ratios) in a full tank of diesel and drive the car hard for the next tank (observe the law and remember cool down period when stopping for the turbo).

http://www.disco3.co.uk/forum/topic79420-120.html
http://www.4x4community.co.za/forum/sho ... hp?t=96797

You are the second person to say stick 2 stroke oil with a tank of diesel, should it be used as preventitive maintenance at all, say stick it in once every 4 fill ups or so?

[dazza]

1500rpm and you have boost already... thats very low you should be happy with that...These cars share the same turbo as the Ibiza Cupra and they are known to be more laggy than say a sportline turbo

[T@nk]

Hi Guys

Just want to give an update.

I did report to you that I have changed the Cam-Belt and the problem nearly went away, because the timing was out a bit.
Well my car started to get heavy on juice and smoking a lot, so I sent it to get the Injectors checked, and ended up Reconditioning them.

R8k later and I must say my low end torque problem and sluggishness at low RPM is a thing of the past. It almost feels like a new car again.

Thanks for all you guys help, very much appreciated.

Regards,
Herman

[Neuk]

R8k isn't too bad as long as the injectors are good for a few more years They cost a bloody fortune...

[T@nk]

R8k isn't too bad as long as the injectors are good for a few more years They cost a bloody fortune...

Yah, I thought so as well. Got quoted R12k each for new ones. That would have been painfull.

[Neuk]

R8k isn't too bad as long as the injectors are good for a few more years They cost a bloody fortune...

Yah, I thought so as well. Got quoted R12k each for new ones. That would have been painfull.

It is the major downfall of the PD based TDi's, the bulk of the engine's are bomb proof with a few issues here and there but replacing injectors, eish...

[Silverbird_96Kw]

Glad to hear your sorted now - We als have a 06 Audi 2.0TDI Multitronic and our issue is:

When I put the car in "Sport" or either "Manual" and put my foot down the car has a Shudder/jerk feeling and car doesn't perform like it use to (lacking in power)...

When it gets to 2500rpm / 3000rpm it feels and looks like the car gets stuck at those refs - the needle moves soooo slow

When booting it in normal drive the car will do exact same. When one drives normally in "Drive" there is no shudder jerk as the car doesn't reach high revs.

It is as if its only doing that shudder when you put your foot down to accelerate quicker. Its hard to explain lol.

Last year the car made a funny sound when starting so we took it to a mechanic and he said its the flywheel in the gearbox. So car was taken to Audi Northcliff and they also started the car (makes a grinding noise) they also confirmed its the flywheel so they had the car for a few days taking the box apart and found no faults, but they did replace that in the end of the day after some fighting as the car JUST came out of motorplan (120000km). End of the day that (grinding noise when starting) problem was a faulty battery.

And that's the only big thing that happened. Rest of the time car was serviced normally. Car has 161000km on

[Tdi jetta 4 ever]

Glad to hear your sorted now - We als have a 06 Audi 2.0TDI Multitronic and our issue is:

When I put the car in "Sport" or either "Manual" and put my foot down the car has a Shudder/jerk feeling and car doesn't perform like it use to (lacking in power)...

When it gets to 2500rpm / 3000rpm it feels and looks like the car gets stuck at those refs - the needle moves soooo slow

When booting it in normal drive the car will do exact same. When one drives normally in "Drive" there is no shudder jerk as the car doesn't reach high revs.

It is as if its only doing that shudder when you put your foot down to accelerate quicker. Its hard to explain lol.

Last year the car made a funny sound when starting so we took it to a mechanic and he said its the flywheel in the gearbox. So car was taken to Audi Northcliff and they also started the car (makes a grinding noise) they also confirmed its the flywheel so they had the car for a few days taking the box apart and found no faults, but they did replace that in the end of the day after some fighting as the car JUST came out of motorplan (120000km). End of the day that (grinding noise when starting) problem was a faulty battery.

And that's the only big thing that happened. Rest of the time car was serviced normally. Car has 161000km on

Did the shudder disappeared after the new battery?

[Silverbird_96Kw]

Did the shudder disappeared after the new battery?

No only the grinding noise when the car started.

It is as if the boost doesnt kick in, if one is on a long road and doing 90 behind a truck and them want to overtake - you can barely do it, as it takes long just to get to 110

[Silverbird_96Kw]

So I took the Audi to KAR and this is the result...