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Why does Chevy Lumina APV lurch or jerk when accelerating between 30-40 mph but accelerates fine at any other speed and drives without any other difficulty?

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2015-07-17 17:41:26
2015-07-17 17:41:26

Is this a automatic? if it is my guess would be the transmission and or the overdrive converter. More info would really help. , EzForJesus

I was told by a friend who's a mechanic to remove the EGR valve (a little penetrating oil first on the 2 studs so that you don't break the studs when loosening the nuts), take a section of broken speedometer cable clamped in a drill, and roto-rooter out the ports in the manifold. He said they get clogged with carbon if driven under city conditions for long periods of time. I tried it on my '94 3.8 V6 and it stopped the lurching.

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An object moving at constant speed in a circle. Acceleration is rate of change of velocity, as velocity is speed in a certain direction, when moving in a circle an object's velocity is constantly changing, as its velocity is changing it is accelerating.

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When an object accelerates it can change its speed or direction of motion. When it accelerates without changing its direction of motion, it can cover any distance in less time.

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Acceleration is the rate of change of velocity over time, so velocity must always be changing if the object is accelerating. HOWEVER, you said speed which means only magnitude, not direction. If you stay the same speed, but change direction then you are accelerating. Simple answer: when you are going the same speed in a circle - velocity changes, therefore acceleration changes.

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Id the car is accelerating with out you pressing the pedal it is a safety hazard that needs to be checked out. I would call you dealer and schedule an appointment and refrain from driving it if possible.

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Yes. Even though its speed doesn't change, its velocity does change, therefore it is accelerating.


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