Boost is out of control...help

brex16 · 10-30-2005, 05:41 PM

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

* Registered users of the site do not see these ads.

5spdfrk · 10-30-2005, 05:44 PM

Do you still have the brass restrictor in the hose coming off the compressor nipple going to the tee?

brex16 · 10-30-2005, 05:46 PM

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

5spdfrk · 10-30-2005, 05:49 PM

Try cleaning the factory boost solenoid.

brex16 · 10-30-2005, 05:50 PM

Quote:

Originally Posted by 5spdfrk

Try cleaning the factory boost solenoid.

how would you do that?

5spdfrk · 10-30-2005, 05:57 PM

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.

brex16 · 10-30-2005, 05:58 PM

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?

5spdfrk · 10-30-2005, 06:02 PM

sure.

brex16 · 10-30-2005, 06:24 PM

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?

KAX · 10-30-2005, 06:26 PM

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.

supermarkus · 10-30-2005, 06:31 PM

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.

brex16 · 10-30-2005, 06:39 PM

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.

supermarkus · 10-30-2005, 07:26 PM

any non-chlorinated carb cleaner will work, take the solenoid off your car to clean it.

eric94501 · 10-30-2005, 09:47 PM

I didn't think the factory have boost control, do you mean the Y lines?

Rickyh · 10-30-2005, 10:02 PM

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.

supermarkus · 10-30-2005, 11:52 PM

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.

brex16 · 11-01-2005, 12:20 PM

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?

5spdfrk · 11-01-2005, 01:05 PM

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.

supermarkus · 11-01-2005, 02:39 PM

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.

5spdfrk · 11-01-2005, 03:24 PM

I believe he is overboosting.

OtisCole · 11-01-2005, 03:45 PM

Couldn't you remove the BCS and just run at wastegate pressure to see if the wastegate itself is the problem?

brex16 · 11-01-2005, 04:52 PM

yes i am overboosting, the car has no control over the boost so theortically i could boost until BOOM haha

KAX · 11-01-2005, 05:01 PM

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.

brex16 · 11-01-2005, 05:19 PM

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

5spdfrk · 11-01-2005, 05:25 PM

It sounds like you may be bleeding off boost somewhere along the lines.

10-30-2005, 05:41 PM	#1
brex16 Scooby Specialist Member#: 78703 Join Date: Jan 2005 Chapter/Region: MAIC Location: Ashburn Vehicle: 2004 WRB STi	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 * Registered users of the site do not see these ads.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Recaro of Japan is out of control	RaceComp Engineering	Interior & Exterior Modification	26	07-12-2005 12:27 AM
HELP! My oil temp is out of control!	JLMarx	Factory 2.0L Turbo Powertrain	19	06-16-2003 03:26 PM
SCIC is out of control!	eric m.	Southern California Impreza Club Forum -- SCIC	39	05-18-2003 05:20 AM
Interior Fogging is out of control!	tsbarro	General Community	17	11-19-2002 11:33 PM
This forum is out of control, too much to read.	pakman916	News & Rumors	3	09-27-2002 07:50 PM

10-30-2005, 05:44 PM	#2
5spdfrk Scooby Specialist Member#: 46407 Join Date: Oct 2003 Chapter/Region: South East Location: Way souf of ATL Vehicle: 2002 WRX blew	Do you still have the brass restrictor in the hose coming off the compressor nipple going to the tee?

10-30-2005, 05:49 PM	#4
5spdfrk Scooby Specialist Member#: 46407 Join Date: Oct 2003 Chapter/Region: South East Location: Way souf of ATL Vehicle: 2002 WRX blew	Try cleaning the factory boost solenoid.

10-30-2005, 05:57 PM	#6
5spdfrk Scooby Specialist Member#: 46407 Join Date: Oct 2003 Chapter/Region: South East Location: Way souf of ATL Vehicle: 2002 WRX blew	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.

10-30-2005, 06:02 PM	#8
5spdfrk Scooby Specialist Member#: 46407 Join Date: Oct 2003 Chapter/Region: South East Location: Way souf of ATL Vehicle: 2002 WRX blew	sure.

10-30-2005, 06:24 PM	#9
brex16 Scooby Specialist Member#: 78703 Join Date: Jan 2005 Chapter/Region: MAIC Location: Ashburn Vehicle: 2004 WRB STi	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?

10-30-2005, 06:26 PM	#10
KAX Scooby Specialist Member#: 63292 Join Date: Jun 2004 Chapter/Region: South East Location: Warner Robins, GA Vehicle: 2000 Subaru 2.5RS 2002 WRX powered	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.

10-30-2005, 06:31 PM	#11
supermarkus Scooby Guru Member#: 6971 Join Date: May 2001 Location: Edmonds, Washington, USA Vehicle: 2008 WRX STi SSM	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.

10-30-2005, 07:26 PM	#13
supermarkus Scooby Guru Member#: 6971 Join Date: May 2001 Location: Edmonds, Washington, USA Vehicle: 2008 WRX STi SSM	any non-chlorinated carb cleaner will work, take the solenoid off your car to clean it.

10-30-2005, 09:47 PM	#14
eric94501 Scooby Newbie Member#: 61686 Join Date: May 2004 Location: Bay Area Vehicle: 2004 WRX Silver	I didn't think the factory have boost control, do you mean the Y lines?

10-30-2005, 10:02 PM	#15
Rickyh Scooby Specialist Member#: 40453 Join Date: Jul 2003 Chapter/Region: South East Location: Metairie, Louisiana	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.

11-01-2005, 12:20 PM	#17
brex16 Scooby Specialist Member#: 78703 Join Date: Jan 2005 Chapter/Region: MAIC Location: Ashburn Vehicle: 2004 WRB STi	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?

11-01-2005, 01:05 PM	#18
5spdfrk Scooby Specialist Member#: 46407 Join Date: Oct 2003 Chapter/Region: South East Location: Way souf of ATL Vehicle: 2002 WRX blew	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.

11-01-2005, 02:39 PM	#19
supermarkus Scooby Guru Member#: 6971 Join Date: May 2001 Location: Edmonds, Washington, USA Vehicle: 2008 WRX STi SSM	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.

11-01-2005, 03:24 PM	#20
5spdfrk Scooby Specialist Member#: 46407 Join Date: Oct 2003 Chapter/Region: South East Location: Way souf of ATL Vehicle: 2002 WRX blew	I believe he is overboosting.

11-01-2005, 03:45 PM	#21
OtisCole Scooby Newbie Member#: 80959 Join Date: Feb 2005 Location: North Branch, MN Vehicle: 2004 WRX - Cobb stg2 PSM	Couldn't you remove the BCS and just run at wastegate pressure to see if the wastegate itself is the problem?

11-01-2005, 04:52 PM	#22
brex16 Scooby Specialist Member#: 78703 Join Date: Jan 2005 Chapter/Region: MAIC Location: Ashburn Vehicle: 2004 WRB STi	yes i am overboosting, the car has no control over the boost so theortically i could boost until BOOM haha

11-01-2005, 05:19 PM	#24
brex16 Scooby Specialist Member#: 78703 Join Date: Jan 2005 Chapter/Region: MAIC Location: Ashburn Vehicle: 2004 WRB STi	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

11-01-2005, 05:25 PM	#25
5spdfrk Scooby Specialist Member#: 46407 Join Date: Oct 2003 Chapter/Region: South East Location: Way souf of ATL Vehicle: 2002 WRX blew	It sounds like you may be bleeding off boost somewhere along the lines.