High idle speed

**CDeeZ** · 06-28-2012

Whenever I'm driving around and I pull out of gear or disengage the clutch, it seems like it takes forever for the idle to settle down from around 2Kish RPM down to around 1Kish.

I tried to fix this with some stuff I read about from RBob's notes on IAC logic "To reduce flair-up on engine start:

Lower the park position @ 0x5C2.
Lower the park to run delay @ 0x5C3.
Lower the kickdown time delay @ 0x5D7.
Lower the coolant vs. position values @ 0x5F5.

To quicken the return to idle after throttle blip:

Set delay @ 0x5E7 to 0.
Increase filter coefficient at 0x5E4.
Reduce throttle follower percentage @ 0x5F0 & 0x5F1."

Not sure if it helped really though....

Here is the original thread http://www.thirdgen.org/techboard/di...-follower.html from the prom tuning guidebook on TGO

What do I need to do to fix this?

'747 $42 L05......

**EagleMark** · 06-28-2012

Is the motor stock?

Could be a mechanical issue as well.

**CDeeZ** · 06-28-2012

Not stock at all. Nothing wild either.

mildly cammed, ported and polished 193 heads, high volume oil pump, ported-enlarged-and-relieved oil return holes in lifter valley, Ultimate TBI, TB spacer, pod spacer, midlength headers, dual 3" exhaust with H pipe and turbo style mufflers. I think that's about all.

Not sure what kind of mechanical issue it could be, everything seems pretty solid with it.

I think it's my tune being so rough maybe?.. my tune is still pretty close to stock, which likely needs much more tweaking from the changes I made to the engine over stock.