('03-'05) 04 xt 5 psi boost? - Subaru Forester Owners Forum
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post #1 of 7 (permalink) Old 05-18-2019, 04:29 PM Thread Starter
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04 xt 5 psi boost?

I installed a boost gauge today and after doing some driving and a few pulls my gauge only got up to 5 psi. I know normal should be around 11 to 12 psi. What is the reasoning it could be doing this? No cel or anything. Any advice would be greatly appreciated

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post #2 of 7 (permalink) Old 05-18-2019, 04:35 PM
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Where are you pulling the boost reading from? Also a restrictive hose can affect readings.

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post #3 of 7 (permalink) Old 05-18-2019, 04:45 PM Thread Starter
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I am pulling it from,the bov hose. It could be the hose it has a smaller diameter to it.

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post #4 of 7 (permalink) Old 05-21-2019, 11:48 AM
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Start with the easy stuff

check your boost control solenoid, might have gotten unplugged or something.

check for restrictor pill in line going from wategate to boost control solenoid, these sometimes get removed accidentally
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post #5 of 7 (permalink) Old 05-21-2019, 01:42 PM
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Lightbulb

More easy stuff.

Check your blow-off valve... they have been known to leak at high pressure (and occasionally at any pressure). A simple test might be to remove the BOV and fashion a blanking plate out of wood or plastic to fit under it. At least for testing purposes, you can drive without a BOV. Did your pressure improve?

Check the rubber duct between the intercooler and throttle body. Cracks, breaks, clamps tight, any obvious issues? For an '04, this straight duct is fairly simple and accessible. For the 09-13 XTs, Subaru fashioned an inaccessible 3-piece duct with removable ends - about 6 places to leak (compared to your 2). That's progress!

From the output side of the turbo to the mouth or input for the throttle body there should be no leaks.


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post #6 of 7 (permalink) Old 05-31-2019, 12:05 PM
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Leaks are also likely on the turbo inlet (unless I missed that). That plastic pipe is 15+ years old and gone thru numerous heat cycles. There are good silicone replacements that do NOT require the IM to come off/be loosened - I did it.

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post #7 of 7 (permalink) Old 05-31-2019, 02:19 PM
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Some people use hair spray on the pressured hoses to stop leaks.
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