Throttle Body - Butterfly?

[mdillian3690]

Hey can anybody tell me if the Butterfly in the Throttle body is suppose to me completely closed flush with throttle body in a closed position or is there slight gap?

[Loren]

I assume you mean at idle... if so pretty much yes. If it is open you can hardly see it. Here is a pic (pre-cleaning) of one we took out of a Boxster (rough idle problem). It is basically the same egas unit your car has. BTW... once it was cleaned up the car ran fine.

Jeff's pic - my hand

[mdillian3690]

Loren,

yes at idle. While the car was off, I took off the throttle body boot to check and see how clean the throttle body is and I could swear that the butterfly stays slightly open. For example if you push the butterfly from the bottom inward it will move forward a bit? Is that normal? If not what needs to be done to adjust/correct. Plus, what symptoms could result if the butterfly is slightly open during idle? Thanks!

I assume you mean at idle... if so pretty much yes. If it is open you can hardly see it. Here is a pic (pre-cleaning) of one we took out of a Boxster (rough idle problem). It is basically the same egas unit your car has. BTW... once it was cleaned up the car ran fine.

Jeff's pic - my hand

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[Loren]

Unlike the older non egas throttle bodies there is no idle air bypass valve. On the older cars the solenoid controlled valve let air in through a passage the bypassed the butterfly. On egas cars I think it is all controlled by minuet movement of the butterfly. So, it it would not surprise me if it were open a fraction. Yes, you can push on the butterfly valve and open it almost horizontal. That is how we cleaned this one - a little carb cleaner and a lint free rag while holding the butterfly open.

[mdillian3690]

Loren,

Thanks! I used some Throttle body cleaner (is that essentially the same as carb cleaner?).

by the way, how do I know if I have a egas or non-egas Pcar? I have a 2000 C2 Tip.

Unlike the older non egas throttle bodies there is no idle air bypass valve. On the older cars the solenoid controlled valve let air in through a passage the bypassed the butterfly. On egas cars I think it is all controlled by minuet movement of the butterfly. So, it it would not surprise me if it were open a fraction. Yes, you can push on the butterfly valve and open it almost horizontal. That is how we cleaned this one - a little carb cleaner and a lint free rag while holding the butterfly open.

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[Loren]

I use Gumout - but basically they are all a laquer thinner base - so keep it away from the paint.

All Carrera's EXCEPT the MY99 C2 are egas.