I've a 3.0l TF and after cleaning the TB to rectify other problems, it is idling faster than I would like.

When dismantling and cleaning the TB, I did not touch the set screw, thinking at the time it was factory pre-set.

I've since turned the set screw fully clockwise. This has reduced the idle speed but not by enough. I am wondering if the cleaning solvent may have damaged any seal associated with the set screw

Is the o-ring just under the set screw head the only set screw seal?

If fast idle was due to air was leaking past the o-ring, would removing the rubber plug and placing a wet finger over the screw housing cause the idle speed to drop (it doesn't), or does it control air ingress from elsewhere.

Mits wants lots of dollars and a wait time to freight in an o-ring - is it a generic o-ring that I can pick up elsewhere.

Thanks

never mind.

never mind.

Well, that's rather frustrating.

Way to curtail discussion while providing little of worth

Can't work out whether you mean I shouldn't mind, you don't mind, or you are admonishing others not to mind

Well, that's rather frustrating.

Way to curtail discussion while providing little of worth

Can't work out whether you mean I shouldn't mind, you don't mind, or you are admonishing others not to mind

Probably all of the above. lol This topic has come up a few times before. lol

The screw you have been playing with is actually an air flow control screw, it needs to be set with the MUT gadget to get the ISC in the correct operating range. The idle speed is under control of the ECU via the ISC. Unlike a carby car, it's a lot more complicated.
The manual warns about not getting cleaning fluid down the passages that lead down into the ISC part. If you didn't block those off, you may want to remove the throttle body off the car and dismantle/clean out.
Whatever the problem now is, it won't be because the air flow screw has a damaged "O" ring, putting your finger over the opening for that screw not changing the idle shows that.
Check for air leaks between the MAF and the throttle body, sufficient slack in the throttle cable, adjustment of the fixed SAS screw.

Thank you for the explanation and suggestions

The TB was stripped down fully for cleaning (except for removal of the air flow screw). Cable appears slack enough so I will look for air leaks

Might help if you state what the rpm the car is idling on at the moment

never mind.

Why don't you help instead of being sarcastic.
I've been on other club sites and this is probably the worst for this sort of thing.

Why don't you help instead of being sarcastic.
I've been on other club sites and this is probably the worst for this sort of thing.

Not sarcastic, that is all in your own imagination.
I started to write a long answer, then realised that it is a topic that has been answered several times before, and a good hunt around this forum would turn up some ideas - so I stopped, deleted and put in the "never mind" answer. Perhaps "do a search" or "read the manual" would have been better?

A bit annoying having new people come on and demand answers to questions that have already been answered.

(I'm assuming the OP washed the throttle body out without covering up the two ports that lead down into the ISC chamber, as the manual tells you. There's a valve down there that opens and closes an air flow passage and responds to coolant temperature, if I remember correctly. Get dirt down there and the throttle body will act up. If that is the case, I don't know how to solve that, other than a full dismantle and clean out. If that doesn't work , I'd go to a wreckers and pick up another throttle body. )

Not sarcastic, that is all in your own imagination.
I started to write a long answer, then realised that it is a topic that has been answered several times before, and a good hunt around this forum would turn up some ideas - so I stopped, deleted and put in the "never mind" answer. Perhaps "do a search" or "read the manual" would have been better?

A bit annoying having new people come on and demand answers to questions that have already been answered.

(I'm assuming the OP washed the throttle body out without covering up the two ports that lead down into the ISC chamber, as the manual tells you. There's a valve down there that opens and closes an air flow passage and responds to coolant temperature, if I remember correctly. Get dirt down there and the throttle body will act up. If that is the case, I don't know how to solve that, other than a full dismantle and clean out. If that doesn't work , I'd go to a wreckers and pick up another throttle body. )

I appreciate you taking the time to respond, but I don't think that there was anything in my post that "demanded" an answer (well, I hope not) - it was more intended to ask a question that I had not been able to answer by searching. I suppose it is fair to say that there is now a finite number of questions for gen 3 magnas, and they will be asked and answered numerous times, and it is probably what keeps forums alive.

I did do quite a lot of hunting, looking for an answer to my main question - whether there was second idle screw seal buried in the TB that controlled air flow. I could find scant mention of that in other posts I stumbled across, and the images in the manual I have are not sufficiently clear.

As mentioned above, apart from removing the idle screw, I had stripped the TB down completely to clean, and hence my concern that the solvent had damaged a seal.

With respect to your other query, it is sitting ~ 950 rpm. Not overly fast, hence my thought that it may be a small idle screw leak

Thanks