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Old 06-17-2012, 03:03 PM   #1
Scooby Newbie
Member#: 189680
Join Date: Sep 2008
Chapter/Region: NWIC
Location: Montana
02 WRX Wagooon MBP
06 Lan Evo IX WW

Default Wastegate Solenoid Control Valve not working..

Ok, so i feel this is more of a electrical issue now then a Solenoid issue.

I have recently just finished my 02 wrx rebuild, i bought this car previously modified and having issues. So i rebuilt it and changed the set up of the car. Now everything on the car is great besides the car will only run 8-10psi (wastegate pressure) im having it tuned by Clark Turner thru a Accessport and a Grimmspeed EBCS. The car previously was tuned with a APS Unichip and a apexi avcr, and when checking the wastegate solenoid power and signal wire both read 12v. When only one should have, so i pulled the ecu back and looked at the wiring and found that the Unichip wiring looked like this:

Now even though the Unichip and apexi avcr was removed the wastegate signal wire was still connected to the 12v source. So i disconnected it from the 12v source and rechecked the voltage, and sure enough the voltage read like they should. But still my solenoid would still not work and im still suck with wastegate pressure.
Ive tried 2 grimmspeed solenoids, and one AEM, ive even gone as far as direct wiring the signal from the ecu for wastegate directly to the solenoid and i still have no response from the solenoid.

Im out of ideas to try and honestly dont know what else could be wrong, The turbo will free boost if the wastegate vac line is pulled so i know the turbo and wastegate are fine. Ive boost leak tested it and fixed what leaks i could find. If anyone has any insight or help me brain storm id greatly appreciate it.. Thanks for viewing.

Also this is my orginal thread in the matter when i thought it was just a bad solenoid, but clearly there is other issues here.http://forums.nasioc.com/forums/show....php?t=2363992
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Old 06-17-2012, 11:51 PM   #2
Scooby Newbie
Member#: 189680
Join Date: Sep 2008
Chapter/Region: NWIC
Location: Montana
02 WRX Wagooon MBP
06 Lan Evo IX WW


Bump.. Anyone?
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Old 06-29-2012, 08:21 PM   #3
Scooby Newbie
Member#: 264463
Join Date: Nov 2010

Did you ever get this sorted?
I'm having the same problem on a 2011 STi (No Unichip)
I have called Grimmspeed and Tial and nobody can give me a reason or even a direction to look.
I was thinking the wastegate could be slightly stuck open but if that was the case, the boost would increase slightly with RPM which is not my case. I have 16lbs with 0% WGDC and 16lbs with 90% WGDC.
GS told me to check if the solenoid was working by connecting a 9V battery and it works just fine.
Have I got the hoses incorrectly connected? I checked their online instructions and all is good.
Port 1 to intake
Port 3 to Compressor
Port 2 to WG

I'm stuck

Last edited by canicoll; 06-29-2012 at 08:26 PM. Reason: Subscribe
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Old 07-07-2012, 11:03 PM   #4
Scooby Specialist
Member#: 64405
Join Date: Jun 2004
Chapter/Region: E. Canada
Location: St-Georges, QC, Canada
2018 STi


I once spent quite some time trying to find an apparently similar problem of wastegate mechanical pressure (boost at 8-10) and it ended up being a dumbass at the dealership added a restrictor pill in the wrong hose. There was an additional restrictor pill in the hose between the wastegate and BCS so it would not purge enough air to keep the wastegate closed no matter what the ecu asked for. Might be worth double checking.

Did you already test the BCS manually with 12v to see if it clicks and blocks/lets air pass through properly? And also clean it while its out. Just to make sure it is working properly.

Edit: looking at your other thread I just noticed you don't have the stock BCS. Not sure if my post is relevant or not in your case.
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