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Impala While undergoing many facelifts in its history, the Impala has proved itself to both civilians and police forces as one of the most capable 4-door cars GM has ever offered. Currently moving towards its 10th generation the Impala is one of the longest lasting and popular models.

2014 Chevrolet Impala
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  #1  
Old 01-12-2009, 12:06 AM
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Default Car is tugging/shaking/jerking at high speeds?

Just curious if anyone else has had this problem. Please excuse my lack of car knowledge if I get any of this wrong..

I have an impala (2000).

Car is jerking/tugging intermittently at highway speeds, but sometimes at lower speeds (usually around 20-25mph and sometimes 40mph). When cruise control is set around 60-70 the car almost always shakes. For some reason, the shaking isnít as bad at 75+ MPH.

Immediately after I let off on the accelerator (on the highway) the car shakes and hesitates a little. When EGR valve is unplugged almost all tugging and shaking goes away.

My car has been doing this for about a year now - on and off. Iíve left the EGR valve unplugged for months at a time. Had the spark plugs and coils (I think?) replaced in march of í08.
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Old 01-22-2009, 11:38 AM
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if you've unplugged the egr valve and the shaking/tugging went away then i think you just answered your own question. replace the egr valve. either that or get your catalytic converter checked. the converters on the impalas have a tendency to go bad.
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Old 01-22-2009, 04:57 PM
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I've read similar symtoms related to the throttle position sensor. When it starts to go, it doesn't know what you are doing with the gas petal. You might consider that.
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Old 02-11-2009, 09:49 PM
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Clogged cat? I agree with milwaukee
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Old 02-24-2009, 07:04 PM
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is the check engine light on? if cat convertors are bad, check engine light will come on and throw code p0430.
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Old 02-26-2009, 09:47 AM
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Quote:
Originally Posted by psthereal View Post
is the check engine light on? if cat convertors are bad, check engine light will come on and throw code p0430.
A stopped up converter does not throw a code. However, you won't go very fast very far if it is stopped up so that doesn't sound like the problem.
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Old 03-07-2009, 12:55 PM
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Go to a salvage yard an buy a used EGR, clean it and try it. If that is it (which it probably is) either use the junk unit or go buy a new one. Sometimes ya just gotta use common sense and not depend strictly on computers to do your thinkin' for you. (LOL) Hell, mechanician can be fun!!
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