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Check the throttle movement Posted by Ari [Email] (#2847) [Profile/Gallery] (more from Ari) on Wed, 25 Jun 2008 12:19:51 In Reply to: RACING IDLE, BAAB [Profile/Gallery] , Wed, 25 Jun 2008 11:39:57 Members do not see ads below this line. - Help Keep This Site Online - Signup |
The throttle closes with a return spring. Make sure nothing is keeping the throttle from closing easily - a kink in the throttle cable, something gunking up the movement, etc.
I'm not sure if the '79 has a dashpot, but check that. It's a little flying-saucer shaped object with a plunger and a spring mounted on the throttle body. When you lift off the throttle, the throttle arm hits the plunger, and between damping in the dashpot and the spring, it slows the throttle to move the last 1/8 of an inch of movement to closure. It should take a second or two to close that last little bit. If the dashpot is mis-aligned or not working right, it may be hanging up.
I'll bet that if you open the hood and manually open the throttle and let it go (engine off is just fine), you'll see what the problem is. I suspect it is mechanical, not fuel-system related.
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