I know this has been posted before, but wanted to let you guys know my dealer is replacing the throttle body to solve this high idle rpm issue. they said it's a known problem in the 2008's now.
if you are having this problem, I would let your dealer know about it, and have the throttle body replaced.
I'll let you know how it goes, should happen this week.

 

man ur dealership is too nice.

it's hard to get a dealership that actually helps.

 

Mine idles high but I'm pretty sure it's the engine warming up. 5 minutes after i turn it on it's pretty constant at 1500 or something. Do your RPM's fluctuate when idle?

 

idle high at start(normal for warming up) then goes down below 1000 rpm when idle after 2-3mins. the real problem seems to be:
even after the car is warmed up, exiting a highway rpms are above 2000 rpm
and
maybe unrelated, but when switch from say 1-2 rpm's go up even after i've taken my foot off the gas.
either way, ill let you guys know the results of the changed throttle body. i'm assuming if they are changing it, they found an issue.

 

for me.... i've experimented it for mine..

it stays@1500 when starting from freezing temperature =.. then it will slow down by approx 100rmp increment... BUT, it doesnt goes up and down

 

check out this previous thread on this issue:

https://www.evolutionm.net/forums/sh...=298536&page=2

 

if your car is idling at above 1200RPM something is wrong. Mivec has a idle stabilization feature to it in our 4b11. something is out of spec. "At idle, valve overlap is eliminated to stabilize combustion"
In other words at 0 speed ECU logic dictates for the above parameter to kick in. its not currently.

I am refering to a hot engine, such as the exiting the highway.

cold engine is a different story