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Hooter valve Posted by Ari [Email] ![]() ![]() In Reply to: idol issues on 92 9kt (long), mike d, Fri, 5 Jan 2007 07:03:18 Members do not see ads below this line. - Help Keep This Site Online - Signup |
A.K.A Turbo bypass valve. Yours is probably shot.
When you're tooling along at 2500-3000 rpm, the turbo is spooled up, and there is a nice fat column of air moving through the piping. Snap the throttle plate closed, and all that air is still moving, being pushed by the turbocharger. The shock wave hits the throttle plate, bounces back, and messes with the flow. The turbo wants to stall, and that interferes with the exhaust. The AMM sees weird stuff. To prevent that, there is the hooter valve. When the throttle shuts, it opens a valve and pipes the air from the pressure side of the turbo to the inlet side. Airflow is maintained. The hooter valve is that black plastic cylinder with two fat hoses and one thin hose. Typically the diaphram fails. If you suck on the thin hose (engine off), it should hold vacuum. If you can pull air through it, the valve is definitely bad. But the symptoms you relate are classic bad hooter valve.
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