How to make High idle work

[nonnieselman]

Hey guys,
I have a 2003 tahoe and im trying to figure out a way to get it to idle higher for winching and such.
Would it be possible to put a 5 prong relay on the IAT sensor and when its energized let it read straight to ground which should be about -40* and i tune that section (B4603) (B3618) (A0008) for a higher idle??
any other tables that would need adjusting?
Im running COS3 also.

Thats the only way i could think how to do it.

[Tinbender59]

i think the best way would be a solenoid, like the 70's cars used, messing with the ECU is generally a bad idea. ther is a product called "auto throttle" senses when battery voltage is below a set threshold, then brings the motors rpm up to stabilize the voltage level

here is one - http://www.kussmaul.com/091-84.html
and another http://www.vanner.com/manuals/02045.pdf

[nonnieselman]

The second one wont work with a DBW throttle..

The first one looks like it might work but i dont see how it would work with DBW also.

[Big Mike]

Always wanted to do it in the tune myself as well but could never come up with a way to do it safely and effectively via driver input. But Off Road Engineering does make a user adjustable high idle box that's plug & play for the 03-up DBW GM's.

http://www.offroadengineering.com/product-gmsuv.html

[RADustin]

what about a segment swap? from a vehicle that had a PTO or similar?

you still using A/c?

[DURAtotheMAX]

I wonder if you could use an 8.1 operating system, and then retune it for the LQ4?

8.1 OS's support factory high idle via the cruise control buttons, for PTO use in the HD pickup trucks.

[RADustin]

Is the 8.1L the only engine offered with PTO?

is the 8.1 coil on plug with high res crank trigger? or is it 4x with a dizzy?

hrm.

[RADustin]

I don't think a controlled vacuum leak will work. It will just make it run like crap.

You need to tip in the throttle some how.

Using the a/c circuits is one way. or an OS that had PTO or some 3rd party stuff.

Is the pedal a potentiometer or an encoder?

[DURAtotheMAX]

Is the 8.1L the only engine offered with PTO?

is the 8.1 coil on plug with high res crank trigger? or is it 4x with a dizzy?

hrm.

8.1 is coil on plug and drive by wire. Its basically identical "electrically" and "controls" wise to an 03+ drive by wire LSx. You'll just have to do some custom tuning to make the ECM work with a smaller displacement engine.

You might have to use an 8.1 throttle body and TAC module too, I dont know if the 8.1 ECM calibration will work with an LSx throttle body and TAC module.

The ECM's are the same (LSx and 8.1)...I mean for grins, you could just reflash your current ECM with an 8.1 calibration and see what happens????

[DURAtotheMAX]

I don't think a controlled vacuum leak will work. It will just make it run like crap.

You need to tip in the throttle some how.

Using the a/c circuits is one way. or an OS that had PTO or some 3rd party stuff.

Is the pedal a potentiometer or an encoder?

Its a potentiometer...but there are THREE, and they all sweep at different ranges/directions...so it would be somewhat complicated to make a fooler.