Afterstart idle control

BottleFed70 · Post by **BottleFed70** » Thu Mar 23, 2006 1:39 pm

MSII with ver 2.3 firmware. Megatune 2.25b748. GM stepper IAC

Hi everyone,

I was wondering if there was a way to "smooth out" the afterstart idle control for a hot start?

My idle control for when the engine is cold is great... but for hot starts it really sucks! I can adjust megatune as far as how long it takes to move the IAC to it's normal position for that engine temp(default is 5 seconds)... but it opens/closes the IAC in large steps instead of blending them together nicely.

For example: When hot the engine will start and idle at 2500PM(40 steps). Then a second later it'll drop to 2000RPM(80 steps) and a second later it'll drop to 1500RPM(120 steps) and another second later it'll finally drop to 1000RPM(160 steps).

I'd prefer to have it smoothly taper down the idle speed instead of doing it in large steps.

Philip Lochner · Post by **Philip Lochner** » Wed Mar 29, 2006 4:05 am

I noticed you have not yet received a reply...

I'm newer than a newby so this may be like the blind leading the blind - if you have not sorted things by this time.

I suggest you adjust your hysteresis to 1 deg and your Crank to run time to run to 1 sec.