sndnappi Posted July 10, 2008 Report Share Posted July 10, 2008 on my 93 sls sometimes when i take my foot off the gas it still accelerates the rpms are at 2000 then if i tap the peddle it goes down does anybody know what this is? Link to comment Share on other sites More sharing options...
BodybyFisher Posted July 10, 2008 Report Share Posted July 10, 2008 It sounds like you are having a problem with the ISC motor, but check for codes first to see if the PCM is setting any codes. Do a search under ISC motor for a lot of info. Do you hear clicking after you turn the car off with the hood up? Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
sndnappi Posted July 10, 2008 Author Report Share Posted July 10, 2008 what is the isc motor and yes i do hear clicking Link to comment Share on other sites More sharing options...
sndnappi Posted July 10, 2008 Author Report Share Posted July 10, 2008 is it anything to worry about or can i just leave it alone Link to comment Share on other sites More sharing options...
BodybyFisher Posted July 10, 2008 Report Share Posted July 10, 2008 is it anything to worry about or can i just leave it alone Can you leave it alone? Didn't you say this? > still accelerates the rpms are at 2000 then if i tap the peddle it goes down Can you deal with that? Did you do a search? for ISC motor as I requested? You probably need to replace the ISC motor if it is clicking and racing like that Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
sndnappi Posted July 10, 2008 Author Report Share Posted July 10, 2008 is it an expensive part and do you recommend that i go to a dealer to fix or do you think that an sts or firestone can fix it. the reason i am asking is that i really dont have the money to put into it Link to comment Share on other sites More sharing options...
BodybyFisher Posted July 10, 2008 Report Share Posted July 10, 2008 is it an expensive part and do you recommend that i go to a dealer to fix or do you think that an sts or firestone can fix it. the reason i am asking is that i really dont have the money to put into it I don't know how mechanically inclined you are but its not hard to install a new ISC motor, the tricky part might be adjusting it. Maybe someone can chime in on how difficult it is to adjust, I think there is a short cut to adjusting it. www.rockauto.com has the ISC motor for $95. I will let someone else chime in on this, you might be able to clean your ISC closed idle contacts. If you do a search I think a member posted details on how to clean it I have seen ISC motors on Ebay and probably can pick one up at a scrap yard if you are tight for money Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
Bruce Nunnally Posted July 10, 2008 Report Share Posted July 10, 2008 This can be caused by a binding accelerator cable. Replacing the cable is the solution in that case. Bruce 2023 Cadillac CT4-V Blackwing Follow me on: Twitter Instagram Youtube Link to comment Share on other sites More sharing options...
Ranger Posted July 10, 2008 Report Share Posted July 10, 2008 Also maybe the TB just needs a good cleaning. Adjust the ISC motor after replacement by pressing on the plunger. It should retract. When it bottoms out, unplug it and adjust the gap between it and the throttle linkage to 0.60. Then plug it back in and your good to go. Don't worry if the idle is a little off for a day or two. It will relearn. Link to comment Share on other sites More sharing options...
BodybyFisher Posted July 10, 2008 Report Share Posted July 10, 2008 Also maybe the TB just needs a good cleaning. Adjust the ISC motor after replacement by pressing on the plunger. It should retract. When it bottoms out, unplug it and adjust the gap between it and the throttle linkage to 0.60. Then plug it back in and your good to go. Don't worry if the idle is a little off for a day or two. It will relearn. Thanks Ranger that is what I was looking for, the procedure in the manual is much harder. Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
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