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Throttle body cleaning?

I want to take it off, so that i can get better acces to the inlet manifold(want to check for air leaks). and clean the thorttle body, should there be any gunk in it. But i have some questions

Do i need to take off the potentiometer?, when cleaning, if so.. can i mess something up with it?.

Do i need to use some speciel cleaner, or can i just use some petrol? and some wd40 afterwords.

Oh and another question. what is the purpose of the coolant hose going to the throttle body? .

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Re: Throttle body cleaning?

On the v6 you can leave the potentiometer in place.. you just have to disconnect the connector block.

You don't need a special cleaner.. use parafin (kerosene) (or WD40) to shift any oily stuff. Be careful about the air-flow sensor this is a little wire that's only protected by a loop of metal. Don't touch it at all or it'll break.

It should be self-cleaning but you can spray it with brake or contact cleaner.. (any high-evaporating solvent) if yours is oily. It should only be oily if you're using a panel or cone filter and have over-oiled it. That stuff is a bit waxy. Any other oily stuff, it can clean off itself.

Coolant hose to the t/b is to warm it up in cold weather. Otherwise you could get "icing" in there during cold weather. If you lived in the desert, probably you wouldn't need it.. but Denmark I'd say leave it in place. The Alfa engineers wouldn't have put it there if they didn't think it needed it.

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Re: Throttle body cleaning?

I usually take off the plastic/rubber intake pipe, which exposes the throttle body on my GTA, then i spray the throttle body with CRC electrical contact cleaner, good stuff cos it does not leave any residue... usually the throttle will get build up of black dust on it after long use without cleaning...carbon..

Please do not under any circumstances touch the throttle body butterfly... you WILL damage it.. i think it has plastic bearings inside it or something...

Just spray copious amounts of WD 40, Q20 or CRC carb cleaner, electrical contact cleaner, and leave it to dry then put the plastic connetors back on..

This is purely from my personal experience, others may disagree..


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BMW E36 M3 3.0 (1996), Subaru Outback 3.0R (2009), Alfa Romeo 1750 GTV (1968)

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(Post Link) post #4 of 4 Old 26-03-09 Thread Starter
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Re: Throttle body cleaning?

Thanks for the advice, and the coolant hose makes sense now

Just had some of it apart and cleaned the throttle body, looked ok, but now it is clean none the less. Didnt touch the air flow sensor since its not in the throttle body But nice to know that it is ok spraying that with contact spray, should it play up in the future.

next stop, rust repair on rear wing and chain tension maybe.
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