DIY 3.0 V6 Throttle Body

[yanni6556]

Ok so I just replaced the throttle body on my 2002 3.0 V6 A4 and didn't end up finding much info on the net. So I thought I would document the procedure and post a step by step guide up for anyone wanting to do the job. The job itself is fairly straightforward however it does get pretty tight back there.

Step 1
Ok so first you need to remove all the plastic covers from the top of the motor and disconnect the negative on the battery.

Step 2
Start to remove the mass airflow piping by unclamping the sensor then move towards the air box piping and remove that. Make sure to be careful when undoing the electrical connector as it can be tricky without the proper tool.

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Step 3
Remove the three bolts holding the rectangle plastic piece at the rear of the intake manifold, carefully unplug the hose connected to the blue check valve as this will get in the way.

Remove the single bolt at the rear of the pipe that feeds into the throttle body, from here on you will need Allen keys or a ratchet with a Allen attachment, there are two different size types with a bigger size required for one of the bolts on the Throttle body. There is also a screw clamp at the connected to this pipe from the left side of the intake manifold, this is fairly straight forward to remove.




Step 4
Now you have access to the throttle body you first need to remove the four Allen key bolts holding it to the rear of the intake manifold. Once you remove the bolts slightly move the Throttle body forward and remove the hose connected to the side via a screw connector. The last two hoses at the bottom of the Throttle Body are connected via hose clamps which are a PITA to remove however if you have small hands it should be fairly easy. Lastly disconnect the electrical connector.










Step 5
Remove the gasket on the intake manifold and you are ready to reseal and reinstall and calibrate via VCDS basic settings 060 and 062.

[2004a4b630QT]

I've used 060. I didn't know about 062. what does that setting do?
Good job. How is it running now?

[yanni6556]

I've used 060. I didn't know about 062. what does that setting do?
Good job. How is it running now?

062 is in regards to the throttle valve angle, according to VCDS it adjusts pedal position and angle of the throttle valve. The car runs very smoothly now, no more hesitation and gets pretty good gas mileage however I also did the pre O2 sensors while I was there as otherwise you have to drop the subframe I believe.

http://www.ross-tech.com/vag-com/m_blocks/060-069.html

[ufkenedy]

Pls slightly dumb question but how can i know its time to change my throttle body. I also use v6 3.0. I get bad gas mileage, rough idle at times, car revs it self some times too and gets better at higher speed / rpm .

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[ufkenedy]

No response.

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[ufkenedy]

My question is too dumb?

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[SJorge3442]

062 is in regards to the throttle valve angle, according to VCDS it adjusts pedal position and angle of the throttle valve. The car runs very smoothly now, no more hesitation and gets pretty good gas mileage however I also did the pre O2 sensors while I was there as otherwise you have to drop the subframe I believe.

http://www.ross-tech.com/vag-com/m_blocks/060-069.html

The pre o2's can be done without removing anything from the bottom of the car. I did them both last year. Was it a headache? Absolutely. Would i want to do it again? Hell no!

[Protection]

The pre o2's can be done without removing anything from the bottom of the car. I did them both last year. Was it a headache? Absolutely. Would i want to do it again? Hell no!

How in God’s name did you remove the driver’s side pre cat O2 sensor w/o umbolting downpipe? Are you sure you aren’t mistaking the pre for post cat sensor? I just replaced this sensor last week and see no way possible to get a 22mm on it while in place. You must have some magic jujitsu special obstruction wrench. Please do tell. I didn’t have to drop the subframe, but removed the driver’s axle and heat shield to lower downpipe into a position to get a wrench on the 02 sensor. Took 5 hours for one miserable 02 sensor.


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[SJorge3442]

How in God’s name did you remove the driver’s side pre cat O2 sensor w/o umbolting downpipe? Are you sure you aren’t mistaking the pre for post cat sensor? I just replaced this sensor last week and see no way possible to get a 22mm on it while in place. You must have some magic jujitsu special obstruction wrench. Please do tell. I didn’t have to drop the subframe, but removed the driver’s axle and heat shield to lower downpipe into a position to get a wrench on the 02 sensor. Took 5 hours for one miserable 02 sensor.


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Do you have an automatic? I have a 6 speed and was able to get to them usong a crows foot wrench. Nothing too crazy, but yeah, took me about 5 hours too.

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[Protection]

Yes, tiptragic. I bet the bigger tranny case makes a difference. I believe the downpipes are different on the Auto than the manual.


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[2004a4b630QT]

Tiptragic indeed. I feel your pain. The tip makes any short cut repair pretty much impossible.
I have to remove my dp's soon to do the flex pipes and will do the o2's then. I anticipate a lot of suffering.

[yanni6556]

Pls slightly dumb question but how can i know its time to change my throttle body. I also use v6 3.0. I get bad gas mileage, rough idle at times, car revs it self some times too and gets better at higher speed / rpm .

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You should probably try clean it first and check for vacuum leaks also scan the car and try recalibrate it first before you spend the money.

[ufkenedy]

Ok will do that. Thanks

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[pablolizarraga]

how can i know its time to change my throttle body. I also use v6 3.0. I get bad gas mileage, rough idle

You can also visually inspect your throttle body. I’m currently getting 15-16MPG street and 20-24MPG hwy w/ my throttle body looking like this. 157,000mi worth of buildup. Typical or worth removing throttle body to clean?



Other than cold start misfires (possible head gasket failure) car idles and accelerates smoothly after 10 second cold start.

Been thinking about removing throttle body to clean it properly. However, the throttle body adaptation is what’s been holding me back.

according to VCDS it adjusts pedal position and angle of the throttle valve.
http://www.ross-tech.com/vag-com/m_blocks/060-069.html

Nice DIY! Since I only have VCDS-lite, I tried the poor man’s way to do throttle body adaptation but didn’t hear anything adjusting by throttle body.

http://www.audizine.com/forum/showth...es-a-different

http://www.audizine.com/forum/showth...Body-Alignment

Will give it another shot later tonight.


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[ufkenedy]

You can also visually inspect your throttle body. I’m currently getting 15-16MPG street and 20-24MPG hwy w/ my throttle body looking like this. 157,000mi worth of buildup. Typical or worth removing throttle body to clean?



Other than cold start misfires (possible head gasket failure) car idles and accelerates smoothly after 10 second cold start.

Been thinking about removing throttle body to clean it properly. However, the throttle body adaptation is what’s been holding me back.



Nice DIY! Since I only have VCDS-lite, I tried the poor man’s way to do throttle body adaptation but didn’t hear anything adjusting by throttle body.

http://www.audizine.com/forum/showth...es-a-different

http://www.audizine.com/forum/showth...Body-Alignment

Will give it another shot later tonight.


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Perfect thanks

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