I know that the front one that has a slotted head and It Is used for the adjustment of the TPS.

To the rear top one, their Is a star headed screw. This one Is used for Idle adjustments.

To the bottom, rear, their an additional slotted screw, except this one Is smaller. I have no Idea what this one Is for. Am I missing any additional points on the other screws? What about the last one?

 

Look on page F2-36 of the FSM, second picture down, labled "throttle adjust screw". If it's that one, it adjusts the cold idle speed.

 

Yes Jason, as I learned 5 minutes after printing out the FSM for the TII. Thanks!

In the FSM, It specifies to adjust Idle via the Bac Valve. I don't have this Valve on (this was substituted for a Block Off Plate) and even If I did have one, their Is no screw In their for the adjustment of Idle.

Hmm... noobiness at It's best but how do I adjust Idle with the the screw found at the back of the TB, seeing how the Bac Valve Is useless and the TMIC Is In the way? Can I do this at Idle w/o the TMIC on?

With my former NA, I knew It Inside out. However, doing a TII conversion, I'm abit sketchy on a few things right now...so bare with me.

 

On my car, everything is gone.

The only way I can set my idle is with the throttle stop screw. Its a small, slotted screw, at the back of the UIM with a 8 or 10mm nut (usually) holding it in place.

 

On my TB, the full TB mod was done too. You are also running a FMIC.

Found at the back of the UIM? I have my spare TB In front of me and I don't see a slotted screw back there. I just see the one for the Fast Idle. Unless of course, you are talking about the 12mm nut found at the end of the Primary Throttle Plates Shaft?

 

Hang on...gonna check the car

 

Its a small screw right where the all the throttle actuators are. It faces diagonally upward toward the passenger side. It rests against this tiny t-shaped piece, and controlls how far the throttle plates are open at idle, I guess.

 

Thanks. Okay, so were talking about the Fast Idle Screw. Finally, I can adjust my Idle w/o the TMIC on, right? I'm pretty sure I can.

 

Hmm, I always thought it was called the Throttle Stop Screw....it was on RETed's site....

Anyway, that I how I adjust the idle, when there is no BAC etc.

 

There are three screws you need to adjust. For best results two of them need to be adjusted with the engine running, but they're all hidden under the intercooler!

The solution is a IC bypass pipe made from PVC pipe and fittings, allowing you to idle the engine with the IC off. It's cheap, quick and easy to make.

The throttle stop screw on top of the TB is used to adjust idle speed when the engine's warm. The other two must be done with the engine completely cold (i.e. left overnight).

The one on top of the thermowax should be set as per the FSM (align the cam roller with the 25degC mark) and is easiest done with the TB off the car but can be done using a mirror. This sets when and for how long the thermowax operates.

The cold idle speed screw (the one you asked about) is used to set the idle speed when the engine's idling on the thermowax. Start the engine when it's completely cold and set the idle to ~1000rpm or whatever you need for a smooth idle.