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Old 10-30-2005, 05:41 PM   #1
brex16
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Unhappy Boost is out of control...help

I took of my mbc because I sold my UTEC to a fellow nasioc member. Reconnected the hose to the factory boost controll system and apparently it doesnt work. It keeps boosting forever so I do not want to push it past its limits. Did my facotry boost controller go bad? I double checked all the lines and they are connected and i reset my ecu...nothing happen. Help me out guru's...any ideas/suggestions for me?

Brian
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Old 10-30-2005, 05:44 PM   #2
5spdfrk
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Do you still have the brass restrictor in the hose coming off the compressor nipple going to the tee?
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Old 10-30-2005, 05:46 PM   #3
brex16
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Quote:
Originally Posted by 5spdfrk
Do you still have the brass restrictor in the hose coming off the compressor nipple going to the tee?
yes, restrictor pill is there
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Old 10-30-2005, 05:49 PM   #4
5spdfrk
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Try cleaning the factory boost solenoid.
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Old 10-30-2005, 05:50 PM   #5
brex16
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Quote:
Originally Posted by 5spdfrk
Try cleaning the factory boost solenoid.
how would you do that?
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Old 10-30-2005, 05:57 PM   #6
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Take it out and spray carb cleaner in it. Let it dry and then reinstall it. It may take more than a few squirts to clean it out.
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Old 10-30-2005, 05:58 PM   #7
brex16
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Quote:
Originally Posted by 5spdfrk
Take it out and spray carb cleaner in it. Let it dry and then reinstall it. It may take more than a few squirts to clean it out.
thanks for the advice, anyone else every had this problem?
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Old 10-30-2005, 06:02 PM   #8
5spdfrk
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sure.
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Old 10-30-2005, 06:24 PM   #9
brex16
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do you guys think my factory boost controller is fried? when i was using the mbc i just left the nipple in the hose on the facotry boost solenoid so maybe some dirt and dust got in there and ruined it. Should i just order a new facotry boost controller?
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Old 10-30-2005, 06:26 PM   #10
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if it just keeps boosting you might want to check the wastegate. im no specialist, but that would be the first thing id check if my boost isnt stopping.
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Old 10-30-2005, 06:31 PM   #11
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The boost control solenoids have been known to gum up when left dormant in favor of an MBC. Assuming you have all of your boost lines set up correctly and in the proper position, your solenoid is probably stuck in the open position. Try the carb cleaner thing to try and free it up.
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Old 10-30-2005, 06:39 PM   #12
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Quote:
Originally Posted by supermarkus
The boost control solenoids have been known to gum up when left dormant in favor of an MBC. Assuming you have all of your boost lines set up correctly and in the proper position, your solenoid is probably stuck in the open position. Try the carb cleaner thing to try and free it up.
Thanks for the quick response guys:-) can you give me some more detailed instructions on which brand of carb cleaner to buy and how to open and clean the solenoid? Sorry i just dont want to break it if its not broken already. It does sound liek it is stuck in the open position. I has to be that or its broken because all the hoses are correct.
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Old 10-30-2005, 07:26 PM   #13
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any non-chlorinated carb cleaner will work, take the solenoid off your car to clean it.
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Old 10-30-2005, 09:47 PM   #14
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I didn't think the factory have boost control, do you mean the Y lines?
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Old 10-30-2005, 10:02 PM   #15
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If you end up looking at getting a new boost solenoid, you should check out the gm solenoid. 35 bux, and works better than stock.
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Old 10-30-2005, 11:52 PM   #16
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Quote:
Originally Posted by eric94501
I didn't think the factory have boost control, do you mean the Y lines?
Are you insane? Of course there is boost control from the factory.
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Old 11-01-2005, 12:20 PM   #17
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ok I replaced the factory boost solenoid and the problem is still there and I am 100% sure the connections are all right. Something with the wastegate maybe?
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Old 11-01-2005, 01:05 PM   #18
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Use this diagram http://www.subaruparts.com/subaru.diag/5A/i081-1.gif
and this one http://www.subaruparts.com/subaru.diag/5A/i073-1.gif
to see if all hoses are in the right place.

Also, make sure all the hoses and fittings are the correct size.
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Old 11-01-2005, 02:39 PM   #19
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I think I missed something, are you overboosting or underboosting? I'm not clear on this point.

If you're under-boosting its possible that part number 22326 is on the wrong side of the T coupler. It needs to come off the compressor housing nipple. If you're overboosting, it's possible that your WG is stuck closed or your hoses have a hole in them.
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Old 11-01-2005, 03:24 PM   #20
5spdfrk
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I believe he is overboosting.
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Old 11-01-2005, 03:45 PM   #21
OtisCole
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Couldn't you remove the BCS and just run at wastegate pressure to see if the wastegate itself is the problem?
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Old 11-01-2005, 04:52 PM   #22
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yes i am overboosting, the car has no control over the boost so theortically i could boost until BOOM haha
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Old 11-01-2005, 05:01 PM   #23
KAX
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Quote:
Originally Posted by OtisCole
Couldn't you remove the BCS and just run at wastegate pressure to see if the wastegate itself is the problem?
that would only disprove the solenoid not working, and he already proved that it wasnt the solenoid. If he has a hole in the line or the lines are messed up, it would still do the same even with the solenoid disconnected.
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Old 11-01-2005, 05:19 PM   #24
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I dont know if this helps you guys but with a mbc i can control the boost just fine and the car runs fine, which is why i figured it was the boost solenoid. I dont know if that elimates some things off the list
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Old 11-01-2005, 05:25 PM   #25
5spdfrk
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It sounds like you may be bleeding off boost somewhere along the lines.
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