Yeah my car had the same problem with the cracked intake manifold gasket (before I owned it, but I was working on it at that stage :) ). It caused a rough idle, not necessarily that low (the stepper motor was compensating a bit). The idle speed should never get down to 500rpm with no load on the engine (even with a crook stepper motor). Sounds like at minimum you need a base idle adjustment. The stepper motor could be carboned up and it's run out of adjustment. The best way to know for sure that the stepper motor is buggered is a resistance check (quite often they're replaced when they only need a clean and a base idle adjustment).
Mat. ----- Original Message ----- From: "Lon" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Tuesday, April 19, 2005 5:14 PM Subject: [GSR_EVO] Re: Idle Control Unit > > > I had a hole in my inlet manifold gasket on Cyl 1 that was causing > me heaps of problems with idle. Within the 12 months it took to find > it my ICS went as well. Talk about compounded problems. > > --- In [email protected], Bing Rufo <[EMAIL PROTECTED]> wrote: > > have the same problem and have been trying to solve it for quite > some time now. ISC is the usual suspect, but I have tried several > ISCs supplied by a japanese surplus supply shop here in manila but > to no avail. Cleaned the throttle body, changed my air flow sensor, > adjusted the tps, BISS, and accelerator cable screw ... nothing > worked. > > > > What partially solved my problem was to rewire the auxfan motor > which turns on at the same time with the A/C compressor and have > their relays separated. Partially i meant when the A/C compressor > turns on, my RPM still drops dramatically but after 3-5 seconds, it > regains to about 950 rpm. > > > > I read in one of the lancer gsr forums that a leaking intercooler > could be the culprit. Might as well have this checked. > > > > Next in line for me to check is the wiring from the ECU to the ISC > coils and a/c compressor relay also in the ECU. Easier said than > done though. > > > > > > > > > > > > mimmo_gsr <[EMAIL PROTECTED]> wrote: > > > > Hey All, > > > > Got a problem with the idle in my GSR. > > > > Symptoms are that the revs tend to drop below 500rpm when at idle, > and > > there is a worse drop when radiator fan comes on or aircon or all > > accessories (lights, demisters, wipers ect) > > > > I don't think its alternator related as I checked that a while > back. > > > > So what I would like to know is can you get the Idle Control unit > > repaired/re-conditioned? as a bit of a browse on the net displays > > prices of $195 for non gen replacements. > > > > Could an alternator/starter motor reconditioning place re-con an > idle > > control unit? > > > > Thanks :) > > > > Mimmo > > > > > > > > > > > > Community email addresses: > > Post message: [email protected] > > Unsubscribe: [EMAIL PROTECTED] > > List Owner: [EMAIL PROTECTED] > > > > > > > > > > --------------------------------- > > Yahoo! Groups Links > > > > To visit your group on the web, go to: > > http://groups.yahoo.com/group/gsr_evo/ > > > > To unsubscribe from this group, send an email to: > > [EMAIL PROTECTED] > > > > Your use of Yahoo! Groups is subject to the Yahoo! Terms of > Service. > > > > > > > > --------------------------------- > > Do you Yahoo!? > > Make Yahoo! your home page > > > > > > > Community email addresses: > Post message: [email protected] > Unsubscribe: [EMAIL PROTECTED] > List Owner: [EMAIL PROTECTED] > > Yahoo! Groups Links > > > > > > > ------------------------ Yahoo! Groups Sponsor --------------------~--> Help save the life of a child. Support St. Jude Children's Research Hospital's 'Thanks & Giving.' http://us.click.yahoo.com/6iY7fA/5WnJAA/Y3ZIAA/_nTolB/TM --------------------------------------------------------------------~-> Community email addresses: Post message: [email protected] Unsubscribe: [EMAIL PROTECTED] List Owner: [EMAIL PROTECTED] Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/gsr_evo/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
