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Hooter valve Posted by Ari [Email] ![]() ![]() In Reply to: car jerks when letting off gas, steven, Sun, 27 Mar 2005 21:25:14 Members do not see ads below this line. - Help Keep This Site Online - Signup |
I'd suspect the hooter valve (aka "Turbo Bypass Valve") When you close the throttle, all that air from the spinning turbo has to go somewhere. If it just hits the closed throttle, it sends a pressure wave back to the turbo - not good for the turbo, and slows it way down, making for poor spool-up. The valve is actuated by manifold vacuum, and on throttle closed, it dumps the pressure back into the turbo intake.
If the valve fails, you can get lousy driveability on decel. You may also get a lousy idle. Check out Quasi's page on it:
http://www.quasimotors.com/hooter.htm
It's pretty easy to test
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