Hello fellow q45 owners I need a little help!!!

[q45fav]

I just purchased my second Q45 and I love it black on black 129,000 mile ...So I decide to to some preventive things.I decided to clean the idle control valve because it felt a little rough at Idle I sort of new to working on cars you all might think I'm crazy but I used wd 40 to clean it when I installed it back smooth as ever now erratic idle and stalling Did I damage it?? I also messed with the screw because it was idling too high please need help or new IAC.

[AZhitman]

Yep. You goofed.

From now on, check with the experts here BEFORE you mess with anything.

You're gonna need to replace the IAC. The screw is NOT for adjusting idle speed. And WD40 is NOT a cleaner.

Welcome aboard, though. We'll get you back on track.

[RustyBucket]

Before you replace the IACV, I recommend buying a can of carb cleaner from the parts store and use that to clean your IACV out (which is what you should have been using in the first place, btw )

Also, do a search on this forum about what the IACV screw is supposed to be adjusted to. I can't remember off the top of my head, but it is a question that has been answered several times around here.

Also, when you removed it and clenaed it out, did the gasket get damaged? If so, yoou may end up with a vacuum leak which can also cause problems.

If cleaning it out with carb cleaner and adjusting it properly doesn't do it, then I'd say it's time to replace the IACV.

[maxnix]

Assuming everything else in the intake system is perfect (clean) as new (vacuum hoses and all) 2.5 - 3.0 turns out.