Question about 2007 Mercury Grand Marquis GS Sedan

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Powertrain malfunction light

Engine jerking, idle very high

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Would need fault codes to help dia

Posted on Jun 12, 2014

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1 Answer

Why does my car jerk when placing it in reverse and in drive


Possible excessively high idle speed due to a problem in the automatic idle speed control system. This can be an engine intake manifold vacuum leak or a sticking Idle air control valve or throttle valve.

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It sounds like a delayed shift issue, does the engine idle speed sound or feel like it is to high? That can cause this issue.

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I would first clean out the throttle body. If it gets dirty the IAC valve (idle air control) can stick causing high idle. The jerk when the A/C turns on is normal. The A/C compressor is soaking up engine power when it turns on.

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What does it mean when the car jerks when you put it into gear?


The car pulls suddenly hard in forward or reverse direction at the moment you change gears.

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Why does my car jerk when i change the transmission from park to drive


the idle RPM is too high
or its just too cold,
how cold is it outdoors?
idle speeds cold can be about 1500 RPM/ cold.
and will ****.
it jerks because you are taking 0 torque from engine
and the sending that to a stalled rear axle.
this cause a ****, that is why the park lock out requires Brakes on
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Car jerks when I stop only when I have air conditioner on


When the aircon is switch on it puts a substantial load to the engine: you need to get your car tuned to take into account the load from the aircon. Most car have a mechanism that increases the idle speed when the aircon is active: if you are unable to get your car tuned yet, try making the engine idle speed slighty faster while you have the aircon turn-on (the ajustment screw should be close to the accelator cable connection at your engine end). Don't make the idle speed too high and check by turning the aircon off and on to assess the best compromise idle speed to stop your car from almost stalling (e.g. jerking).

Good luck!

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when all else fails replace the ignition module on the distributor. As it fails it will cause high idle and other symptoms. Does the problem only happen when the engine is hot?

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