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Re: throttle problem maybe? Posted by Ari [Email] ![]() ![]() In Reply to: throttle problem maybe?, Nathan Pflaum ![]() |
Typically when you're driving along, you've got your foot on the gas, and the throttle is open somewhat. I'll bet this is around 2000-3000 rpm. When you take your foot off the gas, the throttle closes to idle.
If you take your foot off the gas while driving along, does the engine speed increase? That's what I get from the 'faster and faster' comment. Why wouldn't it do this when your foot is on the gas.
My guess is that the throttle is sticky. You take your foot off the gas, but because of binding or grit in the throttle cable, the throttle plate doesn't close. The engine would keep the same speed. The other possibility is the Throttle Dashpot - that's a little flying-saucer shaped device on the throttle arm. It has a pin and spring that contacts the throttle arm. The idea is that when you release the throttle, the pin catches the arm and lets the throttle close slowly. If the dashpot is sticky, it may be holding the throttle open. It would also be mis-adjusted, because the dashpot pin shouldn't be touching the arm under most load conditions. The pin should catch the arm and slowly let the throttle close over 2-4 seconds. If it's misadjusted, it could be keeping the engine at high idle.
Lastly, it could be some bizarre cruise control issue. The usual failure mode for the CC is to not work, and there are many safeties to keep it from kicking in. However, if someone had played with the system, it could be kicking in.
posted by 192.249....
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