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Old 12-05-2013, 04:08 AM   #1
Patrick92
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Member#: 330541
Join Date: Aug 2012
Chapter/Region: SCIC
Location: San Diego, CA
Vehicle:
2004 STI
Silver

Default Capped off hose connection?

Was giving my car a good cleaning under the hood the other day and found a hose connection that was capped off on the throttle body. I'm deploying for 8 months soon and my car is being worked on while I'm gone. Can someone explain what this is for and what is does and if I need to replace it ASAP?

Here's a diagram:
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Old 12-05-2013, 04:30 AM   #2
Jessekrs123
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Join Date: Jan 2010
Chapter/Region: NESIC
Location: Oakville CT
Vehicle:
1993 Legacy Sedan
1984 BRAT

Default

It is a coolant pipe for the throttle body. Looks like somebody previously did the "throttle body coolant bypass" mod.

This is actually a pretty common/cheap/easy mod and has shown a 10-15* reduction in intake temperatures. I cannot recall who tested this out, but there is a graph floating around here somewhere with proof.

People have been concerned that doing this modification in cold climates would lead to the throttle plate freezing. I've done this, and living in the northeast, I've had zero problems, even in the winter.

Since you live in California, you should be even less worried about cold conditions. Don't sweat it, there is nothing to be worried about, it can remain the way it is.

I'm sure if you look around the throttle body area you can find the two coolant hoses clamped together.
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Old 12-05-2013, 04:31 AM   #3
Zefy
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Join Date: Jan 2006
Chapter/Region: VIC
Location: Coquitlam, BC, Canada
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1979 BRAT / 01 RSTI
99 2.5TS (DEAD) / 87 GL

Default

I believe that is the coolant passage for the throttle body. Pretty sure it should connect to the black heater tube coming up just to the driver's side of the throttle body. Someone may have mucked about with it to do something like this:

http://wrxclubau.wordpress.com/2012/...nt-bypass-mod/
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Old 12-05-2013, 05:18 AM   #4
Patrick92
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Member#: 330541
Join Date: Aug 2012
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Location: San Diego, CA
Vehicle:
2004 STI
Silver

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Quote:
Originally Posted by Jessekrs123 View Post
It is a coolant pipe for the throttle body. Looks like somebody previously did the "throttle body coolant bypass" mod.

This is actually a pretty common/cheap/easy mod and has shown a 10-15* reduction in intake temperatures. I cannot recall who tested this out, but there is a graph floating around here somewhere with proof.

People have been concerned that doing this modification in cold climates would lead to the throttle plate freezing. I've done this, and living in the northeast, I've had zero problems, even in the winter.

Since you live in California, you should be even less worried about cold conditions. Don't sweat it, there is nothing to be worried about, it can remain the way it is.

I'm sure if you look around the throttle body area you can find the two coolant hoses clamped together.
You're awesome bro. Thank you!
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