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DISCUSSION => Engine management => Topic started by: mrferg on October 19, 2007, 11:09:31 AM

Title: Icv
Post by: mrferg on October 19, 2007, 11:09:31 AM

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.

Title: Icv
Post by: RED IS 91 on October 19, 2007, 01:58:09 PM

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

Title: Icv
Post by: mrferg on October 19, 2007, 03:30:09 PM

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

Title: Icv
Post by: gearheadE30 on October 19, 2007, 07:32:23 PM

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.

Title: Icv
Post by: mrferg on October 19, 2007, 09:19:05 PM

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

Title: Icv
Post by: vitesse on October 19, 2007, 10:29:47 PM

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.