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Old 10-04-2012, 10:05 AM   #1
Scooby Specialist
Member#: 82744
Join Date: Mar 2005
Chapter/Region: South East
Location: Panama City, FL
2003 WRX

Question Idle surge and no accel in boost

03 WRX
COBB AP 93 Stage 2 tune
Catless TBE
Gutted STI up pipe
AEM short intake (out of the box tune)

Car sat for a week and went to start it and it fired up and idled pretty normal and after about a minute or 2 it started surging from about 500 rpm-1000. Car drives fine if its under boost. If I give it gas and get it into mid boost it just feels like I'm pulling a dump truck behind me.

Attempted problem solving:
Did the ol carb cleaner test to see if there were any vacuum leaks around couplings, ends of hoses, etc. Probably even over did it but no changes in idle. Cleaned MAF which was not dirty at all. Unpluged MAF, car died. Not showing any codes either. Cleaned the IACV and replaced the gasket which looked fine anyways. No dice. Tried swapping out the IACV for a known working one. Again no worky. Unplugged IACV, idle increased to about 1000ish and stayed steady. Fresh tank of 93 oct gas. Installed a Hallman Boost controller last night, since my pro tuner prefers tuning with that and it didn't help either (didn't expect it to). Any other suggestions?

Last edited by 555*; 10-05-2012 at 01:56 PM.
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