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Resolved ISC question

Posted by Cherry, Sep 8, 2019

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  1. Cherry

    Cherry Proven Member

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    Hull, Georgia
    Is there a difference between the non-turbo and turbo ISC motors? The ISC motors that I have gotten so far are reading anywhere from 39-41ohms when I have been seeing that they should read 28-33ohms. Also, from looking at videos of how the motor should act when the key is turned, the ones that I have gotten move maybe 1/32 to 1/16 of an inch and not the range of motion that I have seen.

    I did buy a turbo model ISC because it was around 130-890 dollars cheaper than the non-turbo model. I cant find any information on if these 2 are different though reading how to test them they should all read out the same way no matter if its a non-turbo or turbo. Ive been fighting this idle issue for months now and I havent been able to find the problem which is where testing the ISC comes in at and it reading about +10 ohms than recommended.

    Being that there is a price difference, even on Rockauto being at least 100 dollars more than the recommended turbo model leads me to at least assume that there is a difference between them somehow.

    Does anyone have an answer they could possibly provide since I have looked and I cant find any.
     

    Street Build 305  3

    1991 Mitsubishi Eclipse N/T
    fwd · manual · 1G DSM
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  2. DSMPT

    DSMPT Proven Member

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    91-94 Non turbo/91-99 Turbo all the same. The part number MD628051.
     

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    1990 Mitsubishi Eclipse GSX
    awd · manual · 1G DSM

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    1998 Mitsubishi Eclipse GSX
    awd · automatic · 2G DSM
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  3. Cherry

    Cherry Proven Member

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    Then why is the part number for the non turbo a different part number. Looking at it right now on RockAuto. Non turbo part number is MD628052 and the turbo part number is MD628051 so there must be a difference in some way, its just I cant find what the difference is.
     

    Street Build 305  3

    1991 Mitsubishi Eclipse N/T
    fwd · manual · 1G DSM
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  4. DSMPT

    DSMPT Proven Member

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    I am taking it from a Mitsubishi catalog. 91-94 Non turbo/91-99 Turbo all the same. The part number MD628051 (Old # MD614368). MD628052 is from the other model and year but I believe it is interchangeable.
    You should check with a Mitsu catalog, some manufacturers sometimes don't show correctly.
     

    Drag Race Build 2K  3

    1990 Mitsubishi Eclipse GSX
    awd · manual · 1G DSM

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    1998 Mitsubishi Eclipse GSX
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  5. Cherry

    Cherry Proven Member

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    Do you have a link for the catalog? All of the places that I look at the 2 are different listed for my car. mitsubishiparts.com mitsubishipartswarehouse.com the regular auto parts store, it doesnt matter, it would would seem that the MD628051 that I have 2 of arent actuating for whatever reason or at least when I turn the they they do vibrate and move, but only about 1/32-1/16 of an inch, barely even noticeable while on other threads they move quite a lot when you turn the key from what I have seen.

    Iti s listed on mitsubishiparts.com "Eclipse;2.0L;W/O Turbo; From 5/92, Galant; DOHC; W/O Turbo, Mirage: 1/6L"

    I cant find a catalog online though so a link would be appreciated.
     

    Street Build 305  3

    1991 Mitsubishi Eclipse N/T
    fwd · manual · 1G DSM
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  6. DSMPT

    DSMPT Proven Member

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    Drag Race Build 2K  3

    1990 Mitsubishi Eclipse GSX
    awd · manual · 1G DSM

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    1998 Mitsubishi Eclipse GSX
    awd · automatic · 2G DSM
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  7. Cherry

    Cherry Proven Member

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    The site linked also shows that the MD628052/MD614367 is for the non-turbo and the MD628051/MD614368 is for the turbo.

    Looking at everything listed for North America under the part numbers MD628051/MD614368 it either said 2000Turbo/4WD 2000Turbo/2WD and 2000/4WD. The models were the D32A and D33A

    Everything listed under North America under the part numbers MD628052/MD614367 it says 2000/2WD - HIGH LINE,5FM/T FED, 2000/2WD - HIGH LINE,5FM/T CAL. The models were the D22A.

    So based on that catalog as well they are different... somehow. It would seem like the catalog that you have is the odd ball out in this case for whatever reason. I just know the 2 Turbo versions that I got both dont seem to do much of anything when hooked to my car when I turn the key. They are supposed to move in and out quite a lot, not to mention that the ohms are supposed to be 28-33 but are 39-41.

    Might just have to purchase the more expensive non-turbo one that is listed everywhere. Even just for science at this point. Visually and how they should be tested are the same, im just wondering if they read different signals or the pins are different on them other than 2 and 5. I really dont know.
     

    Street Build 305  3

    1991 Mitsubishi Eclipse N/T
    fwd · manual · 1G DSM
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  8. DSMPT

    DSMPT Proven Member

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    You are mistaken. Based on the catalog, they are all alternate part numbers. I don't know where you are reading it but you are seeing something different from what I am seeing. Even the link I put above shows the same part numbers that I told you earlier. It shows MD614367/MD614368/MD628051/MD628052 is for D22A and D27A.
    Check STM site below, it shows the same alternate part numbers, too.
    https://stmtuned.com/products/mitsubishi-idle-speed-control-motor-isc-2g-dsm
    MD614368.jpg
     

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  9. Cherry

    Cherry Proven Member

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    When you click on the car icon it tells you what cars those part numbers are for.
     

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    1991 Mitsubishi Eclipse N/T
    fwd · manual · 1G DSM
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  10. BTKai

    BTKai Probationary Member

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    I'm running myself a non turbo throttle body in my GST,the ISC and the throttle position sensor are from the same car(non turbo) as well,three years later, i have not had any issue with them! even an ISC from an 3000gt is interchangeable!i know this because in my GSX is what i have right now!
    part numbers might be different from each other,but they do work on our cars!
     

    Street Build 727  4

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    awd · manual · 2G DSM
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  11. ThunderChild

    ThunderChild Supporting VIP

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    The non turbo one you're finding may be for a 1.8 or even later 420a cars. 91-99 use the same ISC motor as far as I've seen, and I've swapped several around on my car.
     

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  12. Cherry

    Cherry Proven Member

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    Well the 2 ISC's that I got listed for turbos arent working from what it would seem. Either I got extremely unlucky with 2 ISC motors, something else is going on or something. I do know the 2 ISC's that I got read 40 ohms, the brand new one not even used straight out of the box read around 40 ohms as well. I guess we will see if the one listed for the non-turbo works.

    Im getting 12v with the key on to pins 2 and 5 that I have seen should be present. I tried to looking up information on here but the links are dead. Its just strange. I had a hell of a time finding head bolts for my engine and was listed under a 95 turbo model so maybe something is going on with the listings. Even the FIAV isnt listed for our cars on most sites and I had to find it under a 3000gt.
     

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    1991 Mitsubishi Eclipse N/T
    fwd · manual · 1G DSM
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  13. Cherry

    Cherry Proven Member

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    I checked the 2 ISC motors that I have and neither one has any movement when jumping with a 6v battery. The vibration in the motor lasts for maybe .25 seconds like a little bump and then nothing more. I might of gotten just extremely unlucky with the 2 purchases. I also looked at the STM ISC motor and it too has a listing different to what people are saying. It says 95-99.

    It would seem that all of these parts stores label them wrong or something. I dont know why 1 different number between the 2 motors equal out to be a 100 dollar mark up if they are the same motors. Rockauto has a 100 dollar markup between the 2, Autozone has a 120 dollar markup, and O'reilly's has around an 800 dollar markup. If you guys are right, which is why I brought up this thread, then these parts stores are running a scam.

    I cant even find a 1.8L ISC motor, or even IAC. I can find the pigtail for it, but not the actual motor. I just looked up the 420a ISC and it has a completely different look to it.

    Its just really weird that the price range swing for these motors are anywhere from 30 dollars to almost 1000. My question is what in the world is going on?

    The one that I did order that is listed for the non-turbo will be here tomorrow so heres to hoping it works. The only reason why Im asking is I have been fighting this idle issue. TPS checks out and goes through the voltages when the throttle is opened and closed, set to .5v at closed throttle, timing set to 5 degrees btdc, checked for vacuum leaks which I found and fixed with new hoses, cleaned the PCV valve and have another one that I left sitting, new BISS though the top is getting stripped with trying to adjust it so much to get the idle set, and when I do go to set the idle with both the timing and diagnostic pins grounded and adjustment to the BISS seems to almost do nothing. I can turn it in and it will get smoother, but overall it doesnt want to go below around 1100 rpm. I can get it to run smooth at 1100, but I cant get it to 750rpm.

    I dont know what else it could be. I dont know if my timing pin is working though but I do know my diagnostic pin under the dash is. I probed those just to make sure. I guess I can try probing the timing pin.
     

    Street Build 305  3

    1991 Mitsubishi Eclipse N/T
    fwd · manual · 1G DSM
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  14. Cherry

    Cherry Proven Member

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    An update, it looks like the difference between the N/A and Turbo ISC from the parts stores is the turbo ones are basically cheap generic ones while the N/A's (at least this is from Autozone) have a Mitsubishi logo on it as well as a few other numbers. If there is any overall difference it looks like there isnt any other than you getting what looks to be a Mitsubishi part over a no markings ISC other than a 5 digit number. The N/A also comes with new mounting screws.

    Ultimately I was trying to find the difference in them and I did though mechanically there isnt one like you guys have said.

    What it looks like at parts stores is that they dont list them in I guess you can say product grades where it looks like you are using a refurb mitsubishi part with the N/A compared to a generic part from their supplier like Duralast for the Turbo model. You would think it would be the other way around though.

    The question is should this warrant a 100 dollar price difference and in some cases an 800 dollar price difference, no. The Haynes way of testing these things are wrong though, and also if you are using the black plastic ISC motors they do read 39ohms when testing them which was throwing me off when testing these things and reading the book I have.

    At least now I can rule that out, thanks guys.
     

    Street Build 305  3

    1991 Mitsubishi Eclipse N/T
    fwd · manual · 1G DSM
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