Help crazy idle 2000-2500 hot and cold

[GST98BIG16G]

Car suddenly started to Idle like crazy 2000-2500 dropping and coming up again..... I changed ISC , tried multiple TPS , throttle cable is not stuck , idle screw is all the way in..... HELP~!~~~~~
Forgot to mention (ITS PULLS HARD AND NORMAL)!!!!!

 

[WolfsFang]

i would clean your throttle plate or look at the idle control valve.

 

[GST98BIG16G]

The car is being used only on weekends , its driven 5000-7000 miles in past 2 years..... I put it together and i dont believe it would need cleaning.... Which one is ICV???

 

[kottyking]

By icv he means Idle speed control valve, which you replace already. What condition is the o-ring in that sits under the adjustment screw?

 

[RedTurboEclipse]

idle misfire perhaps? does it come down to normal after a while?

 

[Dert]

Try backing the throttle cable off, I had similar issues and the cable never ever felt tight, I backed it off a little anyways and got my 2500 rpm idle down to 600

 

[GST98BIG16G]

idle misfire perhaps? does it come down to normal after a while?

no it keeps doing that all the time.....

By icv he means Idle speed control valve, which you replace already. What condition is the o-ring in that sits under the adjustment screw?

good condition .... i checked, damn i know its something stupid and easy that i cant figure out.......

Try backing the throttle cable off, I had similar issues and the cable never ever felt tight, I backed it off a little anyways and got my 2500 rpm idle down to 600

Tried that....

 

[GST98BIG16G]

Anyone in the Area could help me? 60561 DARIEN IL~!?!!?!? SAVE ME PLEASE!!!!!

 

[AG 305]

mine used to do that but go away when it heated up but now it doesnt go away AT ALL. i havent replaced or checked anything yet... i got lotsa work ahead of me

 

[GST98BIG16G]

I did a boost leak test , it seems fine....I messed around with TPS , and now it idles 1500-2000 !!! A LITTLE BETTER !!!! IM GETTING SOMWHERE BUT PLEASE HELP!!!

 

[Absit]

Did you use a datalogger while you "messed around with the TPS"? My car was idling between 2 and 3000. The TPS was reading 10+% via OBDII interface, we used the interface to adjust the TPS back to 0% at full closed, idle seems to be fixed now.

 

[GST98BIG16G]

Did you use a datalogger while you "messed around with the TPS"? My car was idling between 2 and 3000. The TPS was reading 10+% via OBDII interface, we used the interface to adjust the TPS back to 0% at full closed, idle seems to be fixed now.

I have dsm link , not sure how to use it 100%.... any help? No i did not mess around with datalogger.....

 

[cantgo2fast]

I have dsm link , not sure how to use it 100%.... any help? No i did not mess around with datalogger.....

Hook up DSMlink getting running. click ECU->captured vlaues make sure the ECU is capturing the TPS signal. I believe its under TPSvolts or something like that. This is usually already slelcted. Next go to Display->values make sure the TPS and rpm options are selected. Turn key to acc. position start logging then go manually move the throttle plate from full open to full closed. Then go back to your computer and see what the ecu is seeing for throttle position. If its off use the adjustment screw to set it properly. This is really easy to do if you have a buddy to help you.

Another thing you might want to check is the BISS screw could be improperly adjusted and ive heard of them falling out.

 

[Thor25X]

I am currently in the same boat as you. Cannot figure out how to get this idle down. On a cool start up idles at 1500 then creeps to 1000. After a 10 min drive in idling at 3000.

 

[GST98BIG16G]

Hook up DSMlink getting running. click ECU->captured vlaues make sure the ECU is capturing the TPS signal. I believe its under TPSvolts or something like that. This is usually already slelcted. Next go to Display->values make sure the TPS and rpm options are selected. Turn key to acc. position start logging then go manually move the throttle plate from full open to full closed. Then go back to your computer and see what the ecu is seeing for throttle position. If its off use the adjustment screw to set it properly. This is really easy to do if you have a buddy to help you.

Another thing you might want to check is the BISS screw could be improperly adjusted and ive heard of them falling out.

it shows tps voltage at .24 and throttle pos all the way on the bottom.....

Guys please help me?!?!?!?!!??!