What could cause the idle to raise when the car is rolling? I'm at about 1100 stationary in neutral... but if the car is rolling or coasting in neutral it goes up to about 1300. I don't think it's normal... could it be the iacv?

 

Yeah, I was thinking the IACV. That's really the only thing I can think of that raises the idle RPM (although many more things I'm sure can cause a car to bottom out and stall). Try cleaning it and see how things change.

 

It only does it for a sec or two right? My car does it sometimes too.

 

I opened it up and looked at it, the O-ring was perfect and the thing was pretty clean.

I've cleaned the whole TB and replaced the seals... the idle has slowly been fixing itself but it's still higher when rolling. I may try adjusting the BISS and see if that helps fix it. That's the only thing I can think of

 

noobs helping other noobs lol jk

its your IACV tables. Your steps are high and your target idle RPM while driving is high.

Can you flash your rom yourself?

 

Same issue here, tried a bunch of fixes, new IAC, new biss, rebuilt throttle body, adjusted biss through evoscan. But no matter what, while coasting in N the idle hunts until a complete stop then it settles.

It was pretty annoying at first, but I have gotten used to it. Sometimes it's fine, I've noticed after shutting down then restarting it doesn't hunt for idle while coasting.

I see you have cams too, but this wasn't an issue last yr for me.

 

I can flash it myself, but I'd rather not mess with someone elses tune. I'm sure I'll get it fixed eventually