Throttle body clean.

[andychug]

the I.A.T sensor is located just past the throttle body just a few cm along the chamber.
it has one black plug connector and an allen bolt holding it in place. it should easily pull out and if like mine was very very dirty. I think cleaning this gives a better result than just cleaning the T.B.

be careful not to break the wire when scrubbing, I used an old tooth brush and sprayed the cleaner onto the brush not directly on the sensor.
Hope this helps
Andy

[andychug]

I had the pleasure of using this guide a few weeks ago on my Agu 1.8t
I also cleaned my I.A.T sensor (intake air sensor) using carb cleaner and a tooth brush (my mrs doesn't know it was hers)

Before cleaning the T.B, the car was idling very rough, struggled to start without giving the pedal some gas and would constantly stall at junctions and traffic lights. I was lucky if I got 18mpg around town (normal driving).

After unbolting the throttle body it was clear it hadn't been cleaned for some time. After a good scrub and blast of cleaner it looked as good as new. The I.A.T sensor was just as bad, I used a toothbrush and carb cleaner to clean the wire of the sensor, it was caked in black carbon and took some careful cleaning.

When all was back in place I turned the car over and it started first time no problems idle was high at 1800rpm for about 30secs then settled at 900/1000rpm.

It now runs much better, throttle response is smoother, no more kangaroo jumping and stalling and I easilly get over 30mpg around town (normal driving).

I recommend cleaning the I.A.T sensor at the same time it's only one allen bolt and a wiring plug to remove and it's out.

Worth trying before chucking big money at expensive replacement parts

Where is the IAT Sensor? as i am still experiencing problems after cleaning the TB

Cheers.

[XMC1980]

i think ill give this one a miss lol...until i get more skills

by all means taking off the TB is easy mate....make some space as u dont want to drop the TB and damage it(i did mine on the floor in my carpeted garage)and liberally spray ur carb cleaner both sides of the TB, now get a cloth and soak in carb cleaner and clean deposits of both sides of TB for hard to reach places like in the corners use cotton buds soaked in carb cleaner also do the butterfly faces JUST DONT MOVE IT theres alot of resistance so u cant accidently move it then wipe with a clean cloth to dry it (i then left it to 100% dry for 15mins) then refit(making sure all 4 of the 5mm allen bolts are tight and the vaccuum pipe/electical connector are secure!!!REMOVE ALL TOOLS ETC FROM UNDER BONNET if u've left any there!!!!!!!,reconnect battery open drivers door and leave open and turn on ignition to pos2(u will hear chiping noises for about 30secs coming from the TB thats normal as its realigning)i left mine like this for 3mins to 100% make sure was done then start up and leave to idle for a few mins,if all is good(no reason why it shudnt) if for some reason the revs are high etc it'll self learn over a few miles and reset to normal so dont worry now get cleaned up and take the car for a spin and relish how much smoother it is  easy.
***** The only reason i moved mine ONCE was there was a noticible build up of crap when the butterfly was closed i cudnt shift with the flap in the closed position and when i opened the butterfly the edges of the flap were caked in crap and it was totally baked on(cars done 109k) so the edges in the closed position have prob never been cleaned and when i closed it again it fitted better--id not open it again****

I fail to see where it says disconnect battery? I do see re connect battery, so I assume you disconnect it first?

Sorry just checking as I recently had a right headache resetting gear linkage!

Mines AUQ

[Nino]

You dont have to disconnect the batt..... Really....

[WadGTI]

I would certainlly disconnect the battery before taking the throttle assembly apart.

I don't see the benefits of keeping it hooked up as I am always cautious about voltage spike whilst removing/refitting and/or shorting sensors.

[XMC1980]

Okay..... Just did mine today, nice easy job but if I'm honest I'm dissatisfied as it was so clean already! So clean there was no point posting pics.

Thanks for the thread though, nice job to do too

[XMC1980]

Sorry to go off topic but now I'm being a perfectionist if you like cleaning everything in sight, is it worth cleaning MAF sensor or is that best left alone?

Thanks

[WadGTI]

Sorry to go off topic but now I'm being a perfectionist if you like cleaning everything in sight, is it worth cleaning MAF sensor or is that best left alone?

Thanks

If your MAF is working as it should, I wouldn't bother touching it. Thats my own view though!

[systema]

I cleaned my throttle body yesterday as well as resetting it. It started revving around 1800 and then dropping slowly down to normal after a few seconds. It seems to be sticking around 1400 now and dropping down, but there doesn't seem to be any change. I have drove about 50 miles, should It start eventually idle back to normal?

[XMC1980]

When I restarted mine after the clean and reset it started up at around 1100rpm but within seconds idled around 750. I assume each car is different and will respond respectively, I have heard to allow up to 200 miles for it to settle?