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AnswerThe RPM is related to the load on the motor. When you have the Transmission engaged it puts a load on the motor. When it is in park, it does not put a load on the motor. That allows the RPM to increase. AnswerThe computers in some cars are programmed to increase the engine speed when certain accessories are turned on, i.e. when the air conditioner clutch engages. This ensures that the engine does not stall with the added load, and that the engine maintains a high enough speed to keep the alternator generating adequate current to maintain system voltage.

If the increase in RPM is happening just as you put the transmission into Park, it is because the transmission is no longer putting a load on the engine.

Turning off high current accessories can also cause the engine speed to increase slightly.

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โˆ™ 2011-01-21 20:06:00
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Q: Why does your RPM increase when your car is in Park?
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