eldoetc95 Posted September 14, 2004 Report Share Posted September 14, 2004 Hello all, I have a question on replacing my ISC module. I have a '95 Eldo ETC, and this Saturday, my idle shot up to 3000. The previous week, it would start fine, but occasionally, it would idle at 2000 RPM. I would tap the accellerator, and idle would come back to normal, but I could see the storm coming. As many previous posts had stated, the first thing I did was check the TB. It was ugly . Pulled it off, cleaned it very well, including the EGR tube, which had a tiny opening in it from all the crud, reassembled it and....idle at 4000 RPM! Not good . Today, I got home from work and pulled the ISC module off and lo and behold, the car wouldnt idle, but would stay on and run smooth as long as your foot was on the pedal-this was good. As the car was running, the ISC was ratcheting like mad, but was not moving, seems like it was skiping a tooth, as I have read that this can happen. I tried putting pressure on it past the 'detent' like previous posts stated, but I couldn't budge it. The reason I want to replace it is, when removing the ISC Module, the 3 nuts that held it on the bracket were not the same! 2 of them were normal nuts, and 1 was a nylok nut. Since I did not purchase this car new, I suspect that this unit as been serviced in some way before and I don't know if someone has messed with the set screw that is tapped in the plunger. So to eliminate any variables from the past, I want to replace it. Which all this disertation leads to my question. Are new ISC Modules somewhat set to spec as far as the bolt that is screwed into the plunger? Or do I have to adjust that lengh as well as doing the ISC setup via the OBD ( I have the manual, so I have that down........I think). Bad part is, my little parts book doesnt have the part number for the ISC so I have to go to the dealer parts counter instead of going online to GMpartsdirect.com. If anyone has changed their ISC Module and has any helpful hints, I would really appreciate it. Many thanks in advance and thanks to ALL the members on this board for their help and comments. Link to comment Share on other sites More sharing options...
This topic is now archived and is closed to further replies.