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CarMech
04-23-2010, 03:48 PM
99 forester was throwing 3 codes P0420 Cat Eff Below Thresh Bank 1, P0440 EVAP, and P0507 IAC RPM High...

Replaced evap valve and gas filler pipe(Check yours if you haven't most likely caked in mud and rusting behind cover)... P0440 gone and P0420 not back yet
still showing p0507....

Cleaned IAC checked again for vac leaks. Reset code again. Idle still seems rough... waiting for it to come back on....

Any ideas forester community?

dbwhiteman1
05-01-2010, 09:35 PM
Idle High could be vacuum leak. Check under hood rubber lines for cracking and steel lines for rust

jetracer23
06-07-2010, 12:27 PM
I'm having a same issue. I checked for vacuum leak but that wasn't it

CarMech
07-01-2010, 01:14 PM
Well.... we tried several more things... cleaning throttle body... replace IAC... eventually we noticed the throttle cable looked pretty tight. so we loosened the throttle cable a bit and it seems to have solved the problem :) the best we can figure is that the guy who rebuilt the engine just over tightened it...