Low boost for no reason - Subaru WRX Forum
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#1 Old 09-13-2013, 07:10 PM
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Low boost for no reason

Out of the blue my max boost went from .09MPa to .04MPa. Bone stock no tune. I haven't even opened the hood since my last oil change back in MAY or when I adjusted my head lights. last month.

Stock 03 WRX. I did a search and found others with the same problem but they weren't stock and they never say what fixed it.

All right, where is the distributor cap? I need to find the #1 plug wire to hook up my SUN machine.

Last edited by Fidrat; 09-14-2013 at 07:31 PM.
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#2 Old 09-13-2013, 09:21 PM
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Maybe the solenoid is going out? or perhaps you got a boost leak. It not uncommon for hoses to split and cause low boost.
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#3 Old 09-14-2013, 12:51 PM
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Discount the hoses from the bcs and test it.

If ## boost is ok, bsc is bad.

Happened to me in my all turbo car.

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#4 Old 09-14-2013, 08:31 PM
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Quote:
Originally Posted by migueleitor View Post
Discount the hoses from the bcs and test it.

If ## boost is ok, bsc is bad.

Happened to me in my all turbo car.

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Discount the hoses? I think you mean "disconnect". bcs? I assume you mean the boost control solenoid? How do you test it? where is it? ##boost? Not a clue what that means. How would I know if it is ok? What is an all turbo car?

All right, where is the distributor cap? I need to find the #1 plug wire to hook up my SUN machine.
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#5 Old 09-15-2013, 01:56 AM
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When in doubt use the KISS method.
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#6 Old 09-15-2013, 06:28 AM
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Quote:
Originally Posted by texasmr2 View Post
When in doubt use the KISS method.
What?

All right, where is the distributor cap? I need to find the #1 plug wire to hook up my SUN machine.
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#7 Old 09-15-2013, 07:12 AM
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I think he's talking about keep it simple stupid. K.i.s.s.

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#8 Old 09-15-2013, 09:18 AM
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Originally Posted by boo-key bear View Post
I think he's talking about keep it simple stupid. K.i.s.s.
Ha! And here I thought he was talking about the rock band. There,now that we've bridged the generation gap how 'bout a little help?!Notfunny!

All right, where is the distributor cap? I need to find the #1 plug wire to hook up my SUN machine.
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#9 Old 09-19-2013, 05:20 PM
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Try getting a boost leak test done. Dealership might do it, or a performance shop can do one. They will disconnect the hose going to your air intake filter, and hook a coupler with a PSI gauge to it and run air into it, if you have a boost leak the air is going to be escaping from the leak, hopefully you will be able to hear it, if not it may take some feeling around.

If there is no boost leak, you can start looking at the solenoid, this thread might be of interest: How to test boost control solenoid - NASIOC
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#10 Old 09-19-2013, 06:52 PM
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Use soapy water (dawn in a spray bottle) when running the BLT, helps a ton.

Paul
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#11 Old 09-19-2013, 07:20 PM
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Blt ....mmmmm!

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#12 Old 09-19-2013, 07:48 PM
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Boost leak test there buddy
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#13 Old 09-20-2013, 06:37 PM
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Luckily the boost system in these cars are pretty simple. Try looking under the hood of a twin turbo car, that's a nightmare, atleast the JZ's are.
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#14 Old 09-20-2013, 08:09 PM
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I tried resetting the ECU last Sunday and I took it on the interstate this morning for the 1st time since then. My turbo is hitting full boost now. I don't even know why I tried that. It was just the first thing that popped into my head.

Now my question is...why? Why did my boost cut out? Why did it come back when I reset my ECU?

All right, where is the distributor cap? I need to find the #1 plug wire to hook up my SUN machine.
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#15 Old 09-20-2013, 08:28 PM
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No CEL? I wonder if the idiot light is not working.

Kirt
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"When in doubt...flat out" - Colin McRae
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