idle too high

[djmtz263306]

everytime i start my car and let it warm up me idle stays up around 1500 - 2000 rpms throttle cables are fine i cleaned out the throttle body and changed the idle air control a few weeks ago and i still cant figure out whats going on

[dudj]

i had same problem before, replaced whole throttle body and new front o2 sensor problem disappeared. try that.

[djmtz263306]

where did you get it from i've searched the local auto parts and my local dealer want about 300.00

[bronxbombr]

I have a good throttle body and the O2 sensors for sale if you need em. Hit me up

[dudj]

got my TB at the local junkyard and for the O2 sensor bought it brand new

[SuperGALANT]

have u tried hte idle adjuster screw? try backing it out and see what that does.. back it out or screw it farther in.. one way will lower the idle and one will raise it. you may also want a shop to check your o2 sensors as w/ age they get old.. and you may aswell replace them even if they are good if ur going to keep the car for a long time..

[frag_daddy_2007]

are there any engine lights? mine did that for a while and it turned out to be my idle speed sensor assembly

[djmtz263306]

no C.E.L but i tried to hook up my O.B.D ii scanner and that wont even read scanner tells me to hook it up even though its hooked up i thought it was my scanner but i tried it on my truck and it work fine on it . i already check all the cables and they're fine i'll probbaly clean out the throttle actually take if off and clean it other than that guys i'm stumped somebody also told me to check for vacume leaks around the intake i'll probally check timing also when i get the timming light gun

[4-G-rim]

-Check your TPS
-If you have air leaking from your throttle body it could cause high idle
-Did you adjust your BISS screw

[98ACR]

Check the long throttle cable from the Cruise Control box all the way around the valve cover and to the throttle body. Sometimes it will get hung up on something (particularly if you have a STB that forces the cable out of the way) I've had mine get caught a couple of times. Easy to remedy, just make sure it's not caught on anything or shoved too far out of it's preferred path.

[djmtz263306]

which 1 is the biss screw?
either way way i checked on AllData and its also pointing my in the dirrection of a new throttle body

[Da_Revolver]

I agree with 4Grim Check your TPS. That might need to be adjusted.
When I changed my TB it was idling high so I turned the Biss screw all the way down and it was still too high. I then twisted the TPS around some and it works fine now.

[dudj]

where's the tps located at and how is it looks like?

[Da_Revolver]

ok Lift up ya hood. Look straight toward ya throttle. You'll see a black plastic part pointing in 1 o clock angle. Or do you see the hose that is connected from side of the head to your air tube.Risght next to it you'll see it. It might be black with a orange connector.
Its held by 2 screws. One on Top and under it.
Ill try to provide some pics. What I did was un loosen the screws.(one on top is easy the one under is a P.I.T.A.)And I turned it like I was turning to a 12:00 position and it worked great.

[Da_Revolver]

I circled it.

A Closer img

[peanotation]

WARNING: the BISS screw is NOT metal. if you have the screw completely screwed in, do not keep forcing it, you will strip the head faster than a cop loosing his temper. it is made of some wierd composite material that scrapes off with ease. back it out to raise your idle, push it forward to diminish your idle.

TPS: http://members.shaw.ca/dsm.1000q/Enginepri...imer/2G/tps.htm
BISS screw: http://members.shaw.ca/dsm.1000q/Enginepri...mer/2G/biss.htm

[dudj]

thanks for the pic... i think i played with that one before and nothing changed. same problem

[djmtz263306]

my biss screw is already broken but i'll try the tps later on today and see how that works.