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Throttle Body Replacement
- Thread starter StuM
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- body replacement thottle throttle
Its quite straight forward, the air filter casing has to be removed and the throttle body is secured by 4 M6 nuts onto the manifold. There is a pipe and a plug to disconnect and the acellerator cable. Replacement is is a reversal of removal. Here's a pic of the throttle body:
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What indications do you have to suggest you need a new throttle body ? They very rarely need replacing - cleaning maybe ?? 
0000zoon0000
Guest
Hi
I have cleaned mine a month ago. It's very easy to do this. But, I think you'll need to do the adaptation. Without adaptation mine drove like a crazy horse. After the adaptation of the throttle and 100km run it's back to normal. Though some say that it should be OK without adaptation.
The throttle adaptation I did with a KKL cable and VAGCOM software.
Cheers.
I have cleaned mine a month ago. It's very easy to do this. But, I think you'll need to do the adaptation. Without adaptation mine drove like a crazy horse. After the adaptation of the throttle and 100km run it's back to normal. Though some say that it should be OK without adaptation.
The throttle adaptation I did with a KKL cable and VAGCOM software.
Cheers.
Hi All,
Thanks for your replies.
I have tried cleaning the TB in the past, it did run better, but still not right. It ticks over fine, never stalls etc all the time it is untouched, but if you then do something like turn the steering wheel sharply, or pump the brakes, it judders to the point of stalling - it doesn't always stall.
In the end, we took it to a VAG specialist that removed the TB completely and cleaned it up. He also cleaned up the throttle valve potentiometer contacts. This helped a bit, but he said in the end that he suspects it needs a new throttle valve potentiometer. TVPs are not available to buy seperately as they are matched at the factory, so a new one means a new TB. He didn't recommend getting one as at £330 plus fitting it was not an economical repair.
I found a cheaper new TB from a parts supplier and thought I might buy it. However, having now read up further, on auto models, the TVP needs to be 'matched' to the auto gearbox ECU - and this is a specialist VAG job (or maybe VAGCOM, I don't know). So, I'm not sure now.
The other things I was told to try were:
* Coolant temperature sensor - not sure where this lives, and
* Crank Speed Sensor.
We tried to find the latter at the weekend, but had no joy - if anyone knows where it is, please let me know.
Thanks again,
Stu
Thanks for your replies.
I have tried cleaning the TB in the past, it did run better, but still not right. It ticks over fine, never stalls etc all the time it is untouched, but if you then do something like turn the steering wheel sharply, or pump the brakes, it judders to the point of stalling - it doesn't always stall.
In the end, we took it to a VAG specialist that removed the TB completely and cleaned it up. He also cleaned up the throttle valve potentiometer contacts. This helped a bit, but he said in the end that he suspects it needs a new throttle valve potentiometer. TVPs are not available to buy seperately as they are matched at the factory, so a new one means a new TB. He didn't recommend getting one as at £330 plus fitting it was not an economical repair.
I found a cheaper new TB from a parts supplier and thought I might buy it. However, having now read up further, on auto models, the TVP needs to be 'matched' to the auto gearbox ECU - and this is a specialist VAG job (or maybe VAGCOM, I don't know). So, I'm not sure now.
The other things I was told to try were:
* Coolant temperature sensor - not sure where this lives, and
* Crank Speed Sensor.
We tried to find the latter at the weekend, but had no joy - if anyone knows where it is, please let me know.
Thanks again,
Stu
Have a look on VAGcat (google it) or get hold of a MK4 Polo haynes manual (that be the red one) I will have a look and see if I can find anything in my manual that I can scan in but, I will warn you it doesnt always work because the pictures come out really dark.
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