so i have a 06 evo rs with
mbc
hks intake suction kit
tbe
255 fuel pump
iveytune on 21 lbs


lately my idle has been dropping and picking up again from time to time when im at a complete stop ! would i by any chance need a re-tune ?? or is it something else that needs to be looked at ??

any insight back would be great !

 

does it like gradually rev when at a stop light or standstill then bottom out? Or are you saying the idle changes and can get consistently low at points but stays low?

 

boost leak test (for vacuum leaks) and maybe clean the maf first...

 

+1 on the boost leak test.

how long have you been on the tune?

 

Are you turning the steering wheel when the idle drops? Because that is normal.

 

its no boost leak thats normal...sometimes mine does that when i come to a quick full stop, i tried solving it with an HKS gorunding kit, but it will still do it now and then..

 

Seems like my car does this every time I disconnect the battery/reset it. You come to a stop, and the rpms dip and raise.

 

IAC valve on the throttle body can cause this as well. My car would fluctuate and stall out.

You can check this by removing it from the throttle body, 3 or 4 screws.

With it removed from the throttlebody while it is hooked up, have someone turn the key to on, but do not start the car. The valve should open up, if it does not, time to replace. This valve is used to modulate throttle while in idle.

 

when im at a complete stop for about 30 seconds it will dip and rise dip and rise i got a tune about 4 months ago but it was a mild tune, im getting a dynoflash hopefully the problem will go away !

 

Yea common with alot of cars EVOS are notorious. It takes the ECU a while relearn idle