02txceta

iTrader: (4)

I would like to adjust the idle down on my LS1 a bit and not sure where the idle screw might be...??

This is my first LS1 I have had and not sure where it is...had LT1's and know those but do not know where it is on this motor..

Thanks

01ssreda4

iTrader: (96)

my tuner adjusted my idle with a laptop. surely he woulda just used the screw if there was one......

DanO

its called an Idle air control motor which is controlled by the computer. This is what controls the idle of a modern car.

Actually even newer cars that have an electronic throttle body dont even have one of these.

long story short, you need to change your computer calibration, which can be done.

Pro52R

iTrader: (15)

there is no screw.

LS184

iTrader: (7)

mine is at the bottom of throttle body its a pain to get to u will have to feel for it, its a torx screw

ae13291

iTrader: (8)

YES there is a screw!!! if u look on to the throttle body cam, it should be where the cam rests at the idle position on the bottom, but as mentioned it was a pain to get to, i used a very little ratcheting wrench with a torx bit on it

subhumanzz

iTrader: (46)

last time i checked there was a screw on the bottom of my tb.

5_02ls1

iTrader: (20)

you can do that by the screw but its not as simple as turning the screw...theres a procedure that requires unhooking the tps and resetting the pcm"disconecting battery"...I dont care to type it all out do a search on idle adjust

DirtyJohn

iTrader: (8)

The way I understand it is if you want a lower idle you need to command it in the tune.
You have a target idle that the computer will try and maintain.
If you choke it off by closing the throttle, it will fight to get that air by adjusting the IAC.

So my guess is, if you close your throttle with the screw, your idle speed won't go down, the computer will just have to compensate with positive idle trims and your idle speed will stay the same.

That's what I think.

DrkPhx

iTrader: (15)

There is a TB set screw on the LS1 F-body throttle bodies and having it set correctly is an important part of the idle strategies for these cars. Here's a pic. Note how it's mounted upside down, so you have to adjust it from the bottom.

01ssreda4

iTrader: (96)

dont screw with the screw. get a laptop.

DaveX

Don't turn the screw in an attempt to adjust the idle speed! That's not what it's for. What you are actually doing is altering the idle airflow, which you don't want to do without tuning software. The idle speed is controlled by the computer. It may change slightly when you adjust the screw, but the computer will re-learn it back to where it thinks it is supposed to be. If you move the screw very much it will cause you problems and then you won't know where to put it back to.

Pro52R

iTrader: (15)

whoops...

I failed...I was thinking about my Dakota...

Sry for the false advise