2G turbo idle

[clean96GST]

Ok so my 96 GS-T either idles really high at about 1500 or it will just be on the line of dead or dead. Does anyone know how i can fix it?

 

[DSM4me44]

We need a little more information then that. There are some threads here that deal with high idle. Has it always done this? What did you do before this happened? What happens when you adjust the adjustment screw?

 

[clean96GST]

Ok well i bought it about 2 months ago and it would never actually die but it did idle a little rough then i got some valve on my turbo fixed (went from 3psi to 12) and now thats when it happened. Im sorry i don't know what valve or whatever it is is called but i will try to find out. I don't know a lot about turbo's or dsm's yet but i am trying so bare with me please

 

[GSX93DSM]

Did it stay constent at 1500 or did it rev up and down radically.

 

[clean96GST]

It will slowly work up to 1500 from likr 1000 but once it is there it stays constant or slowly keeps going up to 2000

 

[Artago]

I got the same problem. No solution yet. I loosened the TB cables, rebuilt the TB, checked TPS, IAC (ISC), EGR, and all the solenoids... still nothing. It's really pissing me off. If you find an answer please let me know. I'll do the same. Good luck.

Tom

 

[clean96GST]

Thank you and i will do so.

 

[BOC Jason]

Do a boost leak test and check your throttle body area. You might need a new o-ring in you BISS Screw. I had that same problem.

Here's were the BISS Screw can be located.
http://members.shaw.ca/dsm.1000q/Engineprimer/2G/throttlebody.htm
It's circled in purple.

 

[clean96GST]

Do a boost leak test and check your throttle body area. You might need a new o-ring in you BISS Screw. I had that same problem.

Here's were the BISS Screw can be located.
http://members.shaw.ca/dsm.1000q/Engineprimer/2G/throttlebody.htm
It's circled in purple.

Wow that is a sweet site! thanks a ton. So if i take off that screw it should be obvious if that is the problem and i need a new o ring right?

 

[BOC Jason]

Here's the original link to the website..
Virtual Tour of the DSM Engine Bay - Quadrant map

and not necessarily. You're going to want to do a boost leak test first to see if that screws leaking. You just take the intake pipe and put a boost leak tester on the turbo and pressurize the system to the amount of psi you running (roughly 12-14 psi for stock boost). Once you get that much air into the system you'll want to take some soapy water and spray the throttle body area. Make sure you spray the BISS screw so you can check for any air bubbles. It wouldn't hurt to spray around your innercooler piping and injectors area as well to check for leaks while you're already performing the test.

If it is indeed that BISS screw leaking then you're going to want to turn the screw clockwise until it reaches in fully. MAKE SURE you count exactly how many turns it takes for your screw to reach in fully. (example A: 2 1/2 turns clockwise)
After you do that, turn the screw counter-clockwise to take the screw out. Then you're going to want to observe the o-ring and replace it with a new one.
After replacing, Put your BISS Screw back in and turn it clockwise until it's in all the way.
Then you back the screw out the same number of turns as it took to turn to screw in the first place to reach the point of being fully in. (refer to "example A" resulting in 2 1/2 turns counter-clockwise from being fully in)

I hope that helped.


Also if you're new to dsm's here's a website that will probably....i mean will most definitely save you a lot of time, money and heart ache....
Visual Frequently Answered Questions - Home Page

 

[Artago]

I loosened the throttle cables on both the cruise control box and back of the intake manifold. I then adjusted my BISS screw and set it to 800-ish RPM. Problem seems fixed except that it dies when I start it up cold. Gotta give it throttle to keep it going until it warms up.