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  • June 17, 2024, 02:13:17 AM

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Author Topic: Engine Vibration  (Read 2664 times)

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Offline ammachine390

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Engine Vibration
« on: December 21, 2012, 06:13:41 PM »
My Concord has what I believe to be an engine vibration. Whenever the engine hits a certain rpm, the car shakes. I can feel it in the steering wheel, and the whole car shakes. It happens most when cruising at 40 mph, if I let off the gas and let the rpms drop, vibration goes away. If I downshift to second, the rpms increase and I stay at 40 mph, then the shaking stops. So I believe it is completely dependent on engine speed. I'm leaning toward a bad harmonic balancer. Sound right? Any other ideas?
Dan
1981 AMC Concord DL 258 Auto

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Offline amcinstaller

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Re: Engine Vibration
« Reply #1 on: December 21, 2012, 06:32:48 PM »
is this the same car you had the squealing with? or am i totally out to lunch on that one?
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Offline ammachine390

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Re: Engine Vibration
« Reply #2 on: December 21, 2012, 08:14:04 PM »
is this the same car you had the squealing with? or am i totally out to lunch on that one?
Good memory, it is the same car. However, the squealing likes to come and go.
Dan
1981 AMC Concord DL 258 Auto

Click for Villa_Park, IL Forecast" border="0" height="100" width="150

Offline ammachine390

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Re: Engine Vibration
« Reply #3 on: December 21, 2012, 10:55:37 PM »
It does seem to vibrate at idle a little more than it should, at least more than it used to. Will have to try revving it up.
Dan
1981 AMC Concord DL 258 Auto

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Offline BenM

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Re: Engine Vibration
« Reply #4 on: December 23, 2012, 01:35:01 PM »
Some easy things to check - look at all six plugs to see if they look the same and check the vacuum line connections above the runner for cylinder 6. I've had vibrations it the past that are just related to that one cylinder running lean, and have had just one plug foul up before.
NSS#47184

1987 AMC Eagle Sedan -- 1976 Pacer Coupe -- 1968 Pontiac Tempest Custom S -- 1940 Mercury (& a 2002 Jetta Turbodiesel, 5 spd., the Wife's Daily Driver)

Offline carnuck

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Re: Engine Vibration
« Reply #5 on: January 13, 2013, 04:43:42 PM »
My Eagle did that just before the torque converter died.
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Re: Engine Vibration
« Reply #6 on: January 15, 2013, 04:17:20 PM »
Sounds like a faulty torque converter as the shudder appears when the overdrive comes in at approx 40mph....

Anjo
Holland

Offline ammachine390

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Re: Engine Vibration
« Reply #7 on: January 16, 2013, 03:43:40 PM »
Hope it's not the torque converter, transmission was just professionally rebuilt in August.
Dan
1981 AMC Concord DL 258 Auto

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Offline amcinstaller

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Re: Engine Vibration
« Reply #8 on: January 16, 2013, 06:24:40 PM »
if you put the car in park or neutral can you replicate the noise
www.decibelcar.com
www.jeepstrokers.com
1980 AMC Spirit GT  Restomod In Progress
1998 Dodge Stratus  Boring DD With Loud DD Bass
Liquid Audio Styling and Sound
Red Deer, AB, Canada

 

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