3.0TDI bad acceleration - Club Touareg Forums
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post #1 of 13 Old 08-07-2017 Thread Starter
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3.0TDI bad acceleration

2012 3.0 TDI 245 HP sometimes accelerates really well, and sometimes seems very lazy. Bad fuel is not the problem. Where do I start? And sorry for the vague question but I'm just a novice. Thanks.
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post #2 of 13 Old 08-07-2017 Thread Starter
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Ok, more info should be provided.
Background story: a week ago I got the car and when I was cleaning the engine compartment, I accidentally unplugged the large radiator fan. Then I did some offroading and it overheated to 130 celsius. I immediately stopped and waited for it to cool down. No smoke was coming out, everything seems fine. Now it sits perfectly at 90 celsius, so my guess is that the head gasket is fine.

Two days ago I filled 20 litres of OMV Maxx Motion premium diesel. After a few kilometers I felt a change. Before that, if I put the pedal to the metal the front end would rise and the car would take off. Then the power delivery got more linear and it felt lazier.
I burnt all the fuel that day.
Yesterday I got 40 litres of Ecto Super Diesel from Lukoil (I only buy from Lukoil usually, the OMV fill was a mistake). Now the car is awesome again, flooring it feels like getting punched in the face and it's all great.
Today, it started to get lazy again. Same fuel in the tank that worked great yesterday.
Could this be caused by contaminated fuel? If so, what do you recommend? (I know above I said bad fuel is not the case, however it is too strange of a coincidence).
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post #3 of 13 Old 08-07-2017
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Reading your post is it possible that the problem starts as you use the fuel up and if so is there a particular point, say 1/4 full (as the tank is sbout 100 litres capacity) that the problem starts regardless of which fuel you are using?

If so, fill the tank right up and see if you get proper acceleration and then, as you use the fuel, note the point at which you get the problem .

VW Touareg models are as follows:
Generation 1: T1 is model 7LA & facelift T2 is model 7L6
Generation 2: T3 is model 7P5 & facelift T4 is model 7P6
Generation 3: T5 is model CR7 [Not available in "VW Atlas" North America!]
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post #4 of 13 Old 08-07-2017 Thread Starter
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No, fuel level does not affect this, neither does the temperature. I think checking the fuel filter would be a good idea, I'll do that tomorrow.
I also forgot to mention that when flooring it, instant fuel economy is 40l/100km. It used to be higher than that. I have a feeling that it's not getting enough fuel.
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post #5 of 13 Old 08-07-2017
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The Touareg "learns" as you drive, and tries to modify the throttle position vs acceleration curve to better fit your driving style. In my case, since I did a lot of boring highway driving, it thought I was being a gas miser. When driving around town it would feel sluggish until I'd pushed the accelerator down about 3/4, and suddenly the engine RPMs would race and the car would take off.

There's a procedure to reset this learning. Try it.

https://www.clubtouareg.com/forums/f4...st-126786.html
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post #6 of 13 Old 08-08-2017
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It's a gearbox reset as it's the box that learns how you drive! But it only take ten seconds.

Turn the ignition on but do NOT start the car.

Press the accelerator pedal firmly to the floor and hold it there for a full 10 seconds.

Release the pedal

Turn the ignition off and remove the key.

Everyone should be doing this when they first buy their car, or if someone else has been driving it for a bit, or if the type of roads or their style of driving changes, or if they've been towing.

VW Touareg models are as follows:
Generation 1: T1 is model 7LA & facelift T2 is model 7L6
Generation 2: T3 is model 7P5 & facelift T4 is model 7P6
Generation 3: T5 is model CR7 [Not available in "VW Atlas" North America!]
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post #7 of 13 Old 08-08-2017 Thread Starter
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It worked. Huge thanks guys! Flooring it is a joy once again.
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post #8 of 13 Old 12-20-2017
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Will this work on a 14 TDI?

84 VW Rabbit GTI
92 VW Corrado SLC VR6
14 VW Touareg TDI
17 GTI Sport
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post #9 of 13 Old 12-20-2017
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Will this work on a 14 TDI?
Yes. Try it. You have nothing to lose but some time and energy.
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post #10 of 13 Old 12-20-2017 Thread Starter
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Now I look back on this, damn.
Yes it will also work on a T4. It does tend to get lazy and will have an occasional hiccup after a city-driving session.
Still not sure whether I should do a tranny oil+filter change, maybe it would help. I did that on my 7 series and it did wonders, but then the ZF 6 speeders are known to die if you don't change the oil every 100k km.
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