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Q: engine idle speed adjustment on 1992 Mercury Sable

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
my engine idles around 1000 rpm and when I go from park to drive or drive to park the transmission makes a loud engaging noise. Is the rpm set to high and if it is how do you make adjustments
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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Sounds like this vehicle might be new to you, if so you need to know that these vehicles do not have idle adjustment recommendations. They are preset at the factory and should be fine through the life of the vehicle if all other things are normal. When other problems occur, they can cause the high idle. It should be checked by someone with a Ford compatible scan tool, they should check the duty cycle of the idle air control valve and they should be able to figure out if the idle is improperly adjusted or if another condition exists. You could have sensors that are sending the wrong values to the engine control module and this can cause you symptoms, that is why I recommend finding a good shop. An experienced technician should be able to figure it out for you.
When you start up a cold engine, it will initially run about at 1000 rpm. This is a natural thing on this car model.

You just need to wait for about 1.5 minutes, and automatically the idle speed will descrease to about 600 rpm.

When the engine warms up a little bit, and the idle speed descreases, you can shift from parking to drive without making that alarming noise.
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