ISC's - life and brands

[leadfoot6]

I notice that the ISC gets dirty and I wonder if these should be replaced at regular intervals instead of waiting for them to fail. They do seem to fail, with a few threads on these forums about idle issues that turn out to be the ISC playing up. It must be the carbon, oil and hot/cold cycles that do them in. I'd guess the shaft gets sticky and the internals wear.
Not so much the TPS, as far as I can tell.

With my recent idle issue and ISC replacement I found that theres a number of ISC's for Magnas on the market with a wide range in prices from $130 up to $800.
I wonder if theres a preferred brand thats more reliable and longer lasting than others?
Do any of the mechanics here have a feel for this? What brand ISC's should we be looking at and what price is reasonable?

Or would those who have purchased a replacement ISC make any recommendation of any brand given their experience?

The following web page:

https://www.mitsubishipartswarehouse...ntrol-md628059

suggests that a suitable OEM part # is:

md628059

and fits Mitsubishi Diamante from 1997-2004, all using the 6g72/6g74 engines, made in Australia and exported to the USA.

Other associated part numbers are:

MD628059
MD614706
MD614751
MD614678
MD614679
AC249
GEGT7610-313
30GE313GT1330RC2
Fits:
Mitsubishi Diamante (2004-1997)
Mitsubishi Montero (1999-1994)
Mitsubishi Montero Sport (2003-1997)
Include:
IDLE AIR CONTROL VALVE

The site where I obtained the cross referenced part #'s:

https://www.ebay.com.au/itm/NEW-Idle....c100005.m1851

lists the item for sale for $36.99.

NOTE: I am not suggesting that these sites are listing GENUINE MITSUBISHI branded parts for low prices, just that the part #'s listed cross reference with genuine parts #'s

I notice that the ISC gets dirty and I wonder if these should be replaced at regular intervals instead of waiting for them to fail. They do seem to fail, with a few threads on these forums about idle issues that turn out to be the ISC playing up. It must be the carbon, oil and hot/cold cycles that do them in. I'd guess the shaft gets sticky and the internals wear.
Not so much the TPS, as far as I can tell.

.
I don't believe that regular replacement of the ISC is needed.

The original "bumper to bumper" warranty coverage offered by MMAL on the TW was 5 years/100,000km(with extensions dependent on ownership continuity).

Somewhat before and during this period I was working in New/Used car Mitsubishi dealerships.

I did not hear of any specific instances of the ISC motor providing any noteworthy problems at this time requiring special attention or replacement.

My own experience with my TL AWD over now approaching 5 years of ownership(202,000km now using the original ISC as far as I can establish), both before and after replacement of the original 190,000km traveled 6g74 engine with a 6g75 with absolutely no idle issues caused by a potentially faulty ISC, suggests that special attention to this part is not necessary.

A periodic cleaning of the throttle body with the appropriate aggressive throttle body aerosol(making sure to cover the port leading to the ISC) might be helpful with this.

However, I have not needed to do this on my car at any time.

Engines with higher than average distances traveled would be more susceptible to this problem due to piston ring wear/blowby, sludge buildup, and/or blocked PCV.

My memory may be faulty, but I don't remember "Billy Mason PI" with a very well traveled original 6g74 being subject to ISC failure on a regular basis.

https://www.aussiemagna.com/forums/sh...ad.php?t=62564

He might have renewed it at some point, but I did not have time to look through all 14 pages of his ownership experience thread.

His car, with the original engine, IIRC, has traveled over 500,000km but it has been exceptionally well maintained.

Not so much the TPS, as far as I can tell

My regular intermittent stalling problem caused by a progressively deteriorating Air Flow Sensor was 100% cured almost 3 years ago with a replacement second hand sensor($87), as also noted by "an observer".

I have never had any trouble with my TPS.

Possibly, you might have intended to say AFS/AFM?