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Keeps the engine from stalling when you let off the throttle (as when shifting). The dashpot has a diaphragm inside with a small hole in it. At steady throttle pressure is equal at both sides, but when you let off the falling manifold pressure sucks the diaphragm to one side. This moves an actuator which catchs the throttle and sets it gently on the idle stop.

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10y ago
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Q: What is the function of the dashpot on a 1990 Mazda Miata?
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