To re-cap and close this off: I suspect my ISC is dying due to the following conditions... A)Slightly low idle B) no idle-up when I switch the A/C on, instead idle drops ~100 rpm C) slight hesitation/drop in RPM when I open the throttle. I am unsure of the correct ISC on the dsmisc.com web page, and have an e-mail dialog with them, ultimately taking pictures of my current ISC for them to look at...
OK, here's the canonical answer. After looking at the pictures I e-mailed, the reply from dsmisc.com was that the first ISC shown on the
How To Order page (labelled "ISC, Mitsu 4G63 2.0L (DSM 1G/2G)" is the correct application for my 1989 Dodge Raider 3.0L. FastEddy said he had ordered the 2nd one shown on the page, so I suspect they are the same part. Anyways... I ordered an ISC and O-ring last Monday, and received them yesterday (they were shipped on Saturday).
I installed the new ISC at lunch today with no problems. I needed to go through the "idle for 2-3 minutes. Switch off, restart, idle 2-3 minutes... lather, rinse, repeat" cycle specified by the FSM to bring the idle down from an initial point of ~1200 RPM. There is NO hesitation any more on opening the throttle. The idle is rock-solid, and idle-up occurs correctly when the A/C is switched on. Yay for A/C <img src="/forums/images/graemlins/smile.gif" alt="" /> Looking at my old ISC, the pintle is
very loose, and can be rotated probably 10 degrees back and forth.
So I can give a qualified <img src="/forums/images/graemlins/kewl.gif" alt="" /> to dsmisc.com. The only downside was "Doggo" (the owner) seems to be spending a significant part of his week traveling for business, and as such, his e-mail response was somewhat delayed (the website advertises typically same-day reponse, somethimes within the hour...). Never-the-less, he delivered what his website advertises -- genuine Mitsubishi OEM ISC/IAC parts at a decent price. If you're experiencing any problems with your Gen1 ISC, give him some business <img src="/forums/images/graemlins/cheers.gif" alt="" />
Eric W.
