ISC's - life and brands

[KWAWD]

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?

[mcs_xi]

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?

I've seen 3 different types used on my 3rd gens over the years and they seem to be common mitsubishi parts made by denso from memory.

Usually though it is the ISC seal that fails. It gets old and cracks or a vac leak makes the ISC have to work harder then causing the fail.

Mike

[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?

[an observer]

Fwiw

I have a spare isc but the original remains in the car at 211ks.

[leadfoot6]

Fwiw

I have a spare isc but the original remains in the car at 211ks.

Posts such as this are always useful to enable a better understanding of what distances original parts last for.

[an observer]

No problem.

Daylight saving seems to have effected post order again. Dont sweat it too much. Its probably something to do with the vpn server being in the daylight saving time zone. It seems to confuse the server. Sure confuses me.

[leadfoot6]

No problem.

Daylight saving seems to have effected post order again. Dont sweat it too much. Its probably something to do with the vpn server being in the daylight saving time zone. It seems to confuse the server. Sure confuses me.

50 years ago we sent a man to the moon with less computing power than what is contained in today's pocket calculators, but it is proving difficult just to get these posts in correct chronological order.....( or to fully delete a duplicate post.....or.....).

In the interim "Moore's Law"(a doubling of computer processing power every 2 years) was firmly established and validated.

Go figure.

It is possibly somehow linked to the amount of money paid by the Administrators to host the forum.

I fully realise and understand that by not running the "latest and greatest" computer operating system I may suffer the odd "snafu", but it would appear that others who are more likely using newer systems may be suffering similar problems.

A 2004 model TL AWD is likewise not the "latest and greatest" car, but under most circumstances it is rather "uses friendly".

Due to the financial realities of being a disability pensioner, I "make do" with second hand/"hand me down" pretty much everything.

[KWAWD]

Thank for the links Leadfoot. I notice that part site lists the ISC for about $570 AUD while the eBay ad you linked wants $40 for theirs.
Thats a large difference in price points, hence why I'm asking members about their experience with any particular brands or supplier.

I also agree that many ISC's can last a while. I think the one in the KH was still original when I sold it, from memory, not sure.
But I do notice threads here where they fail. I guess it depends on a lot of factors.
Given that they can fail it raises questions such as; at how many k's do they typically fail? (when they fail), how much should we be paying for one? and which brand is reliable?

[leadfoot6]

Thank for the links Leadfoot. I notice that part site lists the ISC for about $570 AUD while the eBay ad you linked wants $40 for theirs.
Thats a large difference in price points, hence why I'm asking members about their experience with any particular brands or supplier.

I also agree that many ISC's can last a while. I think the one in the KH was still original when I sold it, from memory, not sure.
But I do notice threads here where they fail. I guess it depends on a lot of factors.
Given that they can fail it raises questions such as; at how many k's do they typically fail? (when they fail), how much should we be paying for one? and which brand is reliable?

One factor that could cause a failure might be cleaning the throttle body with the correct aerosol cleaner, but not blocking the port to the ISC motor.

I have not done the cleaning process(I have looked inside the T/B but it was quite clean so I let it go) but some that have may have allowed the aggressive aerosol solvent to enter the port and end up seeping into the motor and damaging it.

It is difficult to confirm this, but it would be a reasonable assumption.

The solution would be to remove the motor from the T/B, but then there is the possibility of disturbing the O ring seal whilst doing this.

[leadfoot6]

Using "MD614751" from the part # list that I found earlier resulted in this:

https://www.amazon.com.au/HZTWFC-MD6.../dp/B07F72W88N

Amazon Australia.

$24.99 including free postage.

I have previously purchased a number of different sensors from Amazon USA, mainly oxygen sensors for fellow Nissan R31 Skyline club members(with some other "oddball" cars where appropriate), but I never had a problem at all with any of their parts supplied, even when I was able to buy parts from them at a heavy discount when compared with what major Australian automotive retailers/dealerships wanted to charge for the equivalent product.

I know of the oft' repeated maxim "You get what you pay for", but that is balanced by "A fool and his money are easily parted".

Not every product carrying a high price tag is necessarily value for money, and not every discounted product is rubbish.

The reality is somewhere in between.

In this instance, I would imagine that the low prices seen for some of these parts may be partly due to the fact that the vehicles that they are intended for are approaching the end of their useful lives for most people.

They are not "mainstream" or popular anymore, and retailers are probably wanting to price the parts to clear stock due to continually decreasing demand and sell them whilst they can and get at least something for them , rather than being stuck with them and getting nothing.

"A bird in the hand....."