I saw some posts recently reguarding the old ISC vs the isc on my montero. I occasionally have the idle bounce and am Wondering about sources for the new version of the isc.
Thanks
Gordon

web page This is where a few of the guys on here have gotten them. Way cheaper than the stealer, but still a factory part. Welcome to the wire <img src="/forums/images/graemlins/cheers.gif" alt="" />

My idle is rock solid, but I'm wondering if I should replace my 18 year old ISC anyway after reading this FAQ on DSMISC's web page.

"2. Why should I replace my ISC, besides improving the idle?
There is a far more important reason. If your ISC has shorted coils, it will eventually damage your ECU. Shorted coils will fry the drivers in the ECU; it doesn't take a fully shorted ISC to exceed the current specs on the M5269L drivers Mitsubishi used. They are only rated for 2A 10ms 10% duty cycle pulses max. A closed short (meaning low resistance) ISC coil will easy cause it's corresponding ECU driver to load ("sink") many more times than it normally would; eventually the driver exceeds its rated duty cycle, heats up and shorts. As resistance goes down, current flow increases. The old ISC coils are supposed to test at 28-33 ohms. On those, anything below 14 ohms or above 50 (indicating leaning toward an open coil) would be a problem.

Once an ECU driver goes as a result of shorted coil, several ECU IC circuits will be next in line to be damaged. Why risk your $375 socketed ECU by running with a bad ISC?

3. My ISC tests ok, but I know it's not working. What gives?
Sometimes, the ohms reading can be in spec but the ISC is still bad. Testing with a 6V battery is a better test (tests the ISC motor), but even then you can't be 100% sure. It could be a mechanical plunger problem as opposed to an electrical coil problem, see below #8. Or, your ISC O-ring could be missing, or leaking."

Makes sense to me, but maybe they're just trying to sell ISC's. $131 bucks might make me sleep better, but it'll also buy a lot of cigars.

I replaced the ICS on my 89 V6 around '00 and recieved one from the dealer with an all plastic body. Is this the improved one???

Thanks for the quick answer.... I'll probably order one today. I really believe in better safe than sorry.

I dont know. The new one is black not tan from what I have read here. I'm sure there is more to it in than that though...

I would like to know if the part number for the '89 montero (auto/3.0) is the same as some other vehicles. I think the number is md614283. My question is would a Galant or minivan use the the same number? Would it be a different part number for the exact same part? I am ignorant of the part number scheme.

Where would I look in the bone yard to find the same part ?
I would like to find an extra.

I thought the new ones were like 70 dollars not 150.

CAPS lists md614283 as the PN for the idle air control valve. From the illustration, it's the lower part of the throttle body. Def not the ISC.

md 614282 --ISC servo.

might be still be wrong, I wrote down in my notes

I know that the coils from the newer vehicles will work, but the plunger may differ. I have 2 spare coils. I THINK the 89 has a difference in plunger legnth, as neither unit worked, but the coils do.

Ed

That's the one mate. It was the original PN in effect from 5/88 to 5/89. The next model year it changed to MD614380. CAPS lists PN MD628053 as the replacement for both; $285.79 from the stealer.

MD628053 is listed in CAPS as the replacement part for the Gen2 from 92-94, then it goes to MD628059 for 95-00.

DSMISC's web site is inconsistent. In one place it says they have ISC's for 88-96 Pajero/Montero's, but on the ordering page it only lists Montero 94-01, which seems to correspond to the MD628059. But they also say they can get almost any Mitsu ISC if contacted at [email]sales@dsmisc.com.[/email]