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Newbie Forum: Beginner/newbie/general DSM modification questions. First mods, how to run 10's when you haven't run 12's yet, any tech question that doesn't fit in another tech forum. Probationary Members must limit their tech posts to this forum and sub-forums.

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Old 04-23-2010, 12:14 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #1 (permalink)
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High idle when warm after driving


ive searched and searched and cant find anything with the same problem i am having. this just started last night. after the car warms up and i drive it for a few min the car will idle high when i stop around 2k rpms. if i hit the gas and give it a little rev it drops down to 1500 rpms. every once in awhile it will drop down to 1100 rpms. its a 95 gst 6 bolt bottom end dsm link greddy ic and bov 650cc injectors 255 fuel pump new spark plug and wires replaced a week ago. even adjust the biss screw doesnt change. it can adjust it to where is want it to idle put as soon as the rpms go about 2k it stops a 2k or 1500k. need some help, working on the car now.


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Old 04-23-2010, 12:19 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #2 (permalink)
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did u check for a vac / boost leak after the throttle body ? also make sure the throttle is closing all the way

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Old 04-23-2010, 12:22 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #3 (permalink)
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Sounds like your idle air controller went bad or is malfunctioning for some reason. The idle air control allows additional air into the intake which in turn raises idle.
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Old 04-23-2010, 03:47 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #4 (permalink)
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ok so after driving it all day today with the high idle i let it sit for alittle while and cool down. now its not doing it. i drove it for alittle and then it started to idle at 1500 rpms but only after driving it for alittle while. so then i adjusted the tps properly and its not doing it but i didnt drive it for very long.

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Old 04-29-2010, 05:29 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #5 (permalink)
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try and loosen your throttle cable a little and see if the rpm drop thats what mine was doin.
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Old 07-15-2010, 05:43 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #6 (permalink)
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TurboMR2 did you ever fix this? If so what was the problem? Mine just started doing this today.


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Old 08-31-2010, 10:40 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #7 (permalink)
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Did you ever get this problem fixed I am having the same issue?????
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Old 09-01-2010, 02:40 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #8 (permalink)
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Check your ISC and check for boost or vacuum leaks. Or the TPS. Another thing could be that the TB is dirty and could be getting stuck open a little bit. Also like stated above, you could try loosening your throttle cable to see if that is the problem. I had a bad idle surge problem for a while and when my water pump went out, I got it replaced the surge went away. Now when I start my car it idles at 3k until engine is warm. I have narrowed it down to the TPS or the ISC. Hope this helps.
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Old 09-01-2010, 03:14 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #9 (permalink)
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I am not sure if the 2gs have a idle switch or not. If they do, check it. I had a similar problem on my 1g and the idle switch had gone bad. If you have any way of veiwing live data, then check your tps reading and idle state.

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Old 09-01-2010, 09:29 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #10 (permalink)
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I had the same problem for the longest time on my 92 laser turbo. I finally got a rebuilt throttle body with the fiav bypass plate and my problem went away.

Last edited by slikvik; 09-01-2010 at 09:30 PM. Reason: typo

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Old 05-02-2013, 11:30 AM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #11 (permalink)
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This happened to me almost exact same problem except it was holding 2k rpms but I loosened the throttle cable just a touch and totally fixed the problem.

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Old 05-02-2013, 11:44 AM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #12 (permalink)
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Quote:
Originally Posted by TurboMR2 View Post
ive searched and searched and cant find anything with the same problem i am having. this just started last night. after the car warms up and i drive it for a few min the car will idle high when i stop around 2k rpms. if i hit the gas and give it a little rev it drops down to 1500 rpms. every once in awhile it will drop down to 1100 rpms. its a 95 gst 6 bolt bottom end dsm link greddy ic and bov 650cc injectors 255 fuel pump new spark plug and wires replaced a week ago. even adjust the biss screw doesnt change. it can adjust it to where is want it to idle put as soon as the rpms go about 2k it stops a 2k or 1500k. need some help, working on the car now.
maybe check the voltage from your TPS and verify that it is in spec. i know that when my TPS was adjusted out of spec i had a high idle that i could occasionally get to go lower. also could be the throttle cable starting to get worn out.
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Old 05-02-2013, 12:34 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #13 (permalink)
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I'm having the same issue. After 20 mins of city driving, it goes to 1500 to 2000 rpms and stays there. I loosened up the cable and it still does it. But if i drive on the highway for 15 minutes, then it's as if nothing happened. No boost leaks and my TPS reads .62 which is as close as I can get it by hand. Maybe my ISC?
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Old 05-02-2013, 10:23 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #14 (permalink)
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Quote:
Originally Posted by arabeclipse View Post
I'm having the same issue. After 20 mins of city driving, it goes to 1500 to 2000 rpms and stays there. I loosened up the cable and it still does it. But if i drive on the highway for 15 minutes, then it's as if nothing happened. No boost leaks and my TPS reads .62 which is as close as I can get it by hand. Maybe my ISC?
Yes it definitely could be. Pull it out and see what kind of reading you get on it with a multimeter. Should read between 28-32 ohms I think. Check out this video by Jafro. Mines bad and I have high idle issues as well. My new one should be here tomorrow.

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Old 05-02-2013, 10:51 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #15 (permalink)
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this thread should help

Terry's Talon Troubleshooting Tips #3 - Fast Idle (aka. Idle Surge)
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Old 05-05-2013, 05:24 AM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #16 (permalink)
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Do a boost leak test and listen for leaks at throttle body (TB) shaft seals and/or TB gaskets

If the seals are bad you can replace them yourself - search for how to threads - a bit of a PITA or as an alternative send the TB out for rebuild. I sent mine recently to Steve Monroe at Throttlebodys.com Great service and very reasonable price. The TB gaskets are easy to replace but still also require removal of the TB to get at.


____________________________
Rick H. Original owner '98 GST.

Last edited by SeaveeDSM; 05-05-2013 at 06:35 AM. Reason: fix typos
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Old 05-08-2013, 04:15 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #17 (permalink)
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Quote:
Originally Posted by williamdsm View Post
Yes it definitely could be. Pull it out and see what kind of reading you get on it with a multimeter. Should read between 28-32 ohms I think. Check out this video by Jafro. Mines bad and I have high idle issues as well. My new one should be here tomorrow.

DSM ISC motor testing & Replacement - YouTube
Just checked it. 5&6 is shot on mine too. Guess that was the culprit. Thanks man.
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Old 05-08-2013, 08:57 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #18 (permalink)
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Check IAC, then do a smoke test and look for leaks. Its a waiting game, but well worth it to find the vacuum leak.

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