Hey guys, fairly new here. Bought an 05 Evo, idle wasnt an issue for the first few months, its a fairly new build, 2.0 liter from english racing. I've checked for vacuum leaks, replaced all vacuum lines, no issue found. The Tial 50mm BOV is sometimes 1/8 open at idle, sometimes closed. Pulling -14hg vacum at idle at 1500 -2000 rpms. Upon startup it idles really nice when cold (900rpms), but the minute I hit the throttle it will hang up. (GSC S2 cams). I'm completely new to this platform, what sensors should I be looking at? Maybe have the tuner check the tune?

Thanks,

Mike

 

Boost leak test.

Adjust the BOV till it's closed at idle, you may need to disassemble it and lubricate the moving parts with a quality silicone based lubricant.

 

It will hang up? Are you saying when you push the gas pedal the idle goes higher and then remains higher even after removing your foot from the pedal? This never happened before and no changes were made to the car?

 

I had some rev hang issues and played with the ISCV tables and it has seemed to help. There is a thread on here that describes what to do. Are you on tephra mod v7 by any chance? As above posted id first check for vacuum leaks before I'd look into the tune.

 

Have you tryed to pull the gas pedal back out to see if the idle drops back down? Found this when messing with a friend civic and the cable was not routed right. Just an idea, good luck.