Engine Vibration

[ammachine390]

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?

[amcinstaller]

is this the same car you had the squealing with? or am i totally out to lunch on that one?

[ammachine390]

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.

[ammachine390]

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.

[BenM]

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.

[carnuck]

My Eagle did that just before the torque converter died.

[A-A EAGLE]

Sounds like a faulty torque converter as the shudder appears when the overdrive comes in at approx 40mph....

Anjo
Holland

[ammachine390]

Hope it's not the torque converter, transmission was just professionally rebuilt in August.

[amcinstaller]

if you put the car in park or neutral can you replicate the noise