BOOSTED my ej22e and now I have idle problems, any ideas?

[mitch6]

I have just recently put a turbo on my 1996 subaru legacy ej22e 5MT motor. This is the set-up that I am running:

-IHI VF11 Turbo @ 5 PSI
-Custom up & Down pipe
- K&N intake cone filter to MAF to turbo
- WRX intercooler
- Water cooled
- Bosch BOV
- BLOX 12:1 FMU

The car runs fine under boost and when moving, however my idle surges from 300 RPM - 900 RPM. I am not sure if there is something that I am missing that can cause an idle surge or rough idle? The car was idling perfectly before boost. Is there something else I need to modify such as the MAF, MAP, IACV, O2 snesors?

Any advice is MUCH appreciated!

Thanks!

[Garrison]

Did your TPS get knocked out of alignment? Cleaned your IACV? MAF?

[anothernord]

You have a vacuum leak. That's 99% of idle problems.

[LeggyxPower]

You have a vacuum leak. That's 99% of idle problems.
i second that

[kanner95bk]

I'd love to hear more about your build. Do you have a build thread?

[Beauchemin]

Do you have your bov recirculated? My old wagon had the same issue, as soon as i got my bpv recirculated into my intake it idled fine. Throws off the maf reading i believe

[blankdeluxe]

Mine did the same exact thing when I boosted it. It ran perfect until boost then rolling idle. I'm still working on getting it 100% fixed but the two things that caused it the most for me was the IACV and the Purge Control Solenoid. Which IACV are you running right now? I had issues with the N/A one hitting my turbo and thats why I ended up swapping to the turbo one which caused a fair amount of issues on its own. I ened up using the turbo housing with the N/A motor for the best results with idle surge.