Icv

[mrferg]

Dumb question, how much is the ICV door on an m42 supposed to move? On mine it moves maybe a 8th of an inch, leaving 3/4 of the aperture closed. On my M20 though it opens so that the whole aperture is wide open. Is that normal? New to M42's so please bare with me, thanks.

[RED IS 91]

When I had mine off and put 12 volts to it, it snapped completely open .

[mrferg]

Alright, so mine is busted. Just wanted to be sure, thanks:)

[gearheadE30]

Is there a way to clean these out? I have mine out because I'm cleaning and painting the intake manifold, and might as well do it if it is safe. My idle isn;t bad, though, so if there is any risk of damage I won't mess with it.

[mrferg]

Well I had mine out because of bad idle. The idle was just terrible, it would jump around from about 600rpm up to 1700rpm and would eventually stall. If I unplugged the electrical connection to the icv it would run smoother, just too fast. I cleaned it with carb cleaner to no avail, it wasn't dirty, just mechanically toast. I even tested it externally with 12v and would only ever open 1/4 of the way.

Though on my m20 a few years back the idle got terrible, took it out, flushed it with carb cleaner and voila, worked great! So sometimes you win some

[vitesse]

Ive cleaned mine twice with carb cleaner. However, I've been told many times not to do it because there is a film coating inside of the ICV that will get removed if you clean it with brake clean, or carb cleaner. I won't use it on customers vehicles for that reason, but I gave it a shot on my own car.