trouble getting the right idle speed control motor

[210 dsm]

ok heres my little dilemma. for the longest freaking time ive been drivin my little deathbeast around with ridiculous idle serge because of a dead ISC motor. and i finally got around to buying one of those expensive little idle motors today and i think i could have had a 91' non turbo idle motor in my car (previous owner) the WHOLE TIME...my car is a 90' and requires a specific ISC motor, anyway i took a pic of the new one i bought today for a 90', in hopes that someone can verify that the new motor is the one thats supposed to be in a 1990 model. i dont have a pic on the old one that i found out was from a non turbo 1991 model but it was very different from the new one.

the 91' non-turbo's ISC motor is all black and has the electrical connector built in to the body of it. not in cable harness form. the difference in the two is clear in the pic's of the 1990 ISC motor::::::

 

[jrohner]

I'd just adjust the idle down with the BISS and forget about getting a working ISC. They are always shot, and if left plugged in while shot, they burn the drivers out in the ecu - so even a new ISC won't work.

 

[210 dsm]

turning the idle down dose nothing in my case. with the screw all the way down it just reduces the surging but not by much. im talking 3000 rpm surging.... not fun!!!

 

[92DSMErdrick]

Check for boost leaks. Most likely your FIAV (Fast Idle air valve) is shot. Just do a search on FIAV and you'll find some interesting information. I have an issue with idle surge in my car and I'm pritty sure its that.

 

[210 dsm]

im not trying to find the part thats causing the surging im asking if anybody out there is 110% sure that the pic in the first post is the 1990 model idle speed motor. but thanks for lookin out.

 

[need2boostpsi]

yeah 1990 is the only year they had a pigtail on them. from what you described, your old ISC is the revised one that is worth a lot to most dsmers, it was designed to take the heat better over time then the metal one. and turbo and no-turbo 4g63's all use the same type of ISC except for the 1990 DSM.

 

[Auto RS T]

need2boostpsi is right. That ISC is for a 90 model only, turbo or not. You have to install the ISC that matches your TB. Sounds like yours is upgraded to the 91-94 style. It will have all 4 vacuum lines on top. While a 90 style has 2 nipples on the top. Try and get the updated black housing ISC when you do get another one.

 

[210 dsm]

i already got rid of the black one... but the one in the pic is the one i bought. even though its not the best ISC motor to go with, will it still do the job in the meantime?

and my throttle body is the one with two nipples on the top and two nipples on the side of it. my harness that the pigtail comes from was stretched alot to make the connection in the ISC, thats how i knew it was wrong. even though you say its kinda a upgrade, i still prefure the metal ISC so im not stretching the pigtail and wires. when it gos out again ill just jack another one from my work.

 

[Auto RS T]

If you have the 2 nipple TB (90 style). The first ISC in your original post is the correct one. Check that the harness pins are still intact and the wires aren't broken along the way since you said the harness was stretched.

 

[210 dsm]

If you have the 2 nipple TB (90 style). The first ISC in your original post is the correct one. Check that the harness pins are still intact and the wires aren't broken along the way since you said the harness was stretched.

yeah i cheaked it out , my harness is still good. thanks.

 

[210 dsm]

dose anybody know the part # for the o-ring that gos between the ISC motor and the Throttle body?

 

[210 dsm]

nevermind . i got it