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Why does my engine rev the RPM gage up and down while in park?
Wiki User
∙ 14y ago
Because the flywheel needs to spin in order to cool the coolant that's in the radiator. While the car is moving, the flywheel is moving anyway. However, while in park, the car is not moving, and therefore the flywheel is not moving either. Every so often the engine will rev, spin the flywheel, and keep the engine from overheating.
This may be the worst answer ever written. I can"t tell you what is wrong but I can promise it is not the flywheel. The flywheel is in the back of the engine, it connects the enginge drive to the transmission, it also has the teeth that the starter uses to turn the enginr to start it. The part the last responder was refing to is the colling fan. While a cluth fan (which a 95 jimmy has) can spin faster than the engine RPM, it wouldn't reflect on the tachometer. I would guess you have an issue with a TPS (thottle position sensor, or the IAC (Idle Air Control).
Wiki User
∙ 14y ago
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