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Old 02-13-2003, 09:17 PM   #1
Uncle Scotty
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Default Only 8 PSI boost...

I installed a boost guage today, and I'm only getting ~8 PSI boost. The car has not felt quite up to power for the last few days, and I have a definite BOV sound at ~8 PSI in 1st-2nd-3rd gears(haven't run it up any higher, yet) with a hesitation as boost levels off.
I'm getting ~20in VAC at idle, and no 'funny' or unusual sounds or any CEL's.

The car is an '02 MT sedan with the 3/16" restrictor mod, and a hacked silencer as the only mods.

Thanks
Scott
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Old 02-13-2003, 09:50 PM   #2
NavyBlueSubaru
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Lightbulb solinoid response

Sounds to me like your just running wastegate spring pressure ~8psi. Perhaps your stock solinoid isnt bleeding any pressure into the atmosphere. Surprised that your not showing and CEL's. Check the connection into your soliniod, both hoses and electrical connection. If either hose was disconnected though, it would still bleed some and pull more than 8, so im almost 100% positive that the soliniod isnt functioning properly, so try disconnecting it and reconnecting it. Perhaps reset the computer by disconnecting the battery for 5-15mins, just long enough to reflash the computer. See if that works

Jeff
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Old 02-13-2003, 10:12 PM   #3
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Like Jeff said, check the hoses and the solenoid and try resetting the ECU.

Try to switch solenoids with another WRX and see what happens with your boost...if you get full boost, take it to the dealer and bitch at them until they fix the problem.

I had to buy the solenoid myself and it cost like $120
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Old 02-13-2003, 10:34 PM   #4
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Thanks...

Sorry for the n00b question, but where is the solenoid...?


I did replace the air filter a week or so ago....

Scott

Edit: Got it....BTW, I forgot some nice person posted the shop manual....
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Old 02-13-2003, 10:41 PM   #5
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It lives beneath the plastic plate just in front of the passenger side strut tower. You should be able to hear the solenoid cycle when the car is under enough load to bring it out of vacuum. Listen for a clicking sound. You may need to have someone apply throttle while in gear and left footing, though this is dangerous. Unfortunately I dont know what the stock BCSDC.


SLR-
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Old 02-13-2003, 11:53 PM   #6
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DAMN....Me thinks the solenoid is toast.
Everything is good as far as I can tell vacuum line wise. Did the quickie ECU re-set and NO JOY.

thebusiness999....Were these your symptoms?

Any other ideas, anyone?
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Old 02-14-2003, 12:19 AM   #7
Bad Dogg
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Default Same thing happened to me

It was not the solenoid, but something wrong with the turbo itself!! Took it into the dealer, was replaced under warranty.. Now getting 13-15 lb boost like always...

Take it in and have it checked out

bD
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Old 02-14-2003, 01:09 AM   #8
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yea, the car is basically stock, there's no reason why you shouldn't bring it back to the dealer

and even if you're past 36k, I think turbo is under the power train warranty

speed safely

Brian
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Old 02-14-2003, 01:32 AM   #9
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The nearest dealer to me is ~50 miles, and per their website, the earliest I can get in is 0700 19FEB....They better have a cheap rental!
DAMN!!!

Still under 36k mi., soooo....

Thanks again

Scott
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Old 02-14-2003, 09:13 AM   #10
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~50 miles

wow, I'm spoiled here in the NE, there's a Subaru dealership every 10-20. From most places at least/

I still think it'd be worthwhile, but I would check with them about the rental, would really suck to get stuck out there for a bit

speed safely

Brian
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Old 02-14-2003, 09:19 AM   #11
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it might help to know for sure what is wrong.

Get a friend to rev the engine several times to redline (quickly so you build boost). The goal is to build as much boost as you can while sitting in neutral.

Now, while he's doing that, hold your fingers around the solenoid and feel if it's clicking open or not. Nothing will happen if you aren't revving it correctly or if your solenoid is broken.
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Old 02-14-2003, 09:30 AM   #12
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Quote:
Originally posted by nhluhr
it might help to know for sure what is wrong.

Get a friend to rev the engine several times to redline (quickly so you build boost). The goal is to build as much boost as you can while sitting in neutral.

Now, while he's doing that, hold your fingers around the solenoid and feel if it's clicking open or not. Nothing will happen if you aren't revving it correctly or if your solenoid is broken.
my solenoid works fine and I think the highest boost I've ever gotten in neutral was 3psi, and I was thinking that was mainly because of the throttle position and the ebc

speed safely

Brian
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Old 02-14-2003, 09:58 AM   #13
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check the hoses i sound like what i did. there is a restrictor i the hose on the one going to the turbo look in the hose and make sure it is there. you might have switch the hose around. after my mbc off i had the hose switch around.
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Old 02-14-2003, 11:01 AM   #14
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DOH!!

Got it figgured out...I had put the hoses I removed back wrong when I was playing with a MBC idea..... agwrx gave me the hint.


Thanks for all the help.

Scott
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Old 02-14-2003, 03:03 PM   #15
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glad I could help

good to know either way

speed safely

Brian
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Old 02-14-2003, 03:46 PM   #16
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Quote:
Originally posted by Uncle Scotty

thebusiness999....Were these your symptoms?

Yup, those were my exact symptoms. And of course that stupid dealer refused to even consider replacing the solenoid, so I had to do it myself They thought it was impossible that it would fail and that a CEL would come on if it did fail

edit: I just read through the thread and see you fixed it. Good stuff
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Old 02-14-2003, 06:53 PM   #17
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Quote:
Originally posted by agwrx
check the hoses i sound like what i did. there is a restrictor i the hose on the one going to the turbo look in the hose and make sure it is there. you might have switch the hose around. after my mbc off i had the hose switch around.
I did the same thinga couple of weeks ago. I replaced the hose from the turbo inlet to the T fitting. It took me a while to realize that I had removed the restrictor.
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Old 02-28-2003, 09:09 PM   #18
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SO basically if you dont have the stock vacuum hoses, a person should order the stock lines from the dealer to alleviate the problem?? PLease let me know, cause i have replaced the vacuum lines and now experience the same problem. Thanks.

Ryan
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