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Re: Thanks, but what's the "hooter" valve?
Posted by Noel (more from Noel) on Tue, 25 Jul 2006 05:47:59
In Reply to: Thanks, but what's the "hooter" valve?, Allen in N.O., Tue, 25 Jul 2006 05:21:11
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Also known as the turbo bypass valve, it bleeds off boost pressure when you let off the gas.
Facing the front of the car, it is mounted on the right side of the engine on the metal pipe that runs from the intercooler outlet (comes out below the radiator) to the throttle body. (see picture) It has a vacuum hose on it. Take off the vacuum hose and attach a piece of vacuum hose to the nipple. Try to suck on it. If you get air through it the valve is shot. When my boost gauge wouldn't move much I could practically breathe thru the valve. If you don't have spare vac hose, just remove the valve and (ahem!) suck on the nipple. If you get air the valve is toast.
$49.27 at eEuroparts.
Alternatively, inspect the vacuum hose for splits and follow it up to the Y fitting that goes to the throttle body and to the gauge. The hose could also be cracked anywhere along there.
posted by 24.52.16...
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