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Old 11-25-2013, 04:48 PM   #1
mdazb
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Another vibration

Well after picking up my 01 ZX3 "mechanics special" I've replaced all 3 motor mounts (completly trashed). Now it idles smooth. You have to look at the tach to make sure it's still running.

Now I noticed something while driving it today. When I'm at a stop with my foot on the brake, it's smooth. When I barely take pressure of the brake pedal, I feel a vibration. Not shaking the car but a slight vibration. Apply pressure to the brake pedal and it goes away?
Any input would be helpful


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Old 11-26-2013, 12:37 PM   #2
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Sticking caliber?
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Old 11-26-2013, 12:54 PM   #3
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So light on the peddle to where your still stopped?

I am taking a guess that this is a automatic? This is typical to automatics where if there is a load the TQ it might vibrate a little more vs when in neutral and no "load". you may be on the edge of overcoming the TQ stall and the brake pressure required to keep the car parked.

Just a thought... if its an auto, if its a manual then it might be something else.
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Old 11-26-2013, 01:10 PM   #4
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Yes it is an auto trans.
The car is not moving. Just when barely lift you foot off the pedal, the vibration returns. Apply that same pressure back on the pedal and it goes away. Almost like it's being felt through the strut.
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Old 11-26-2013, 01:51 PM   #5
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so while in gear and at a dead stop depending on how much pressure you out on the pedal will adjust the vibration?

I would say its the TQ converter getting more or less of the stall. Not familiar with Autos on the focus and there specific behavior. My Auto Jeep does somewhat the same thing and its a completely different car.

Only thing I can think of is perhaps pressing harder on the brakes is opening more of a vacuum on the brake booster. so the motor will behave differently than when your lightly pressing and not "using" the brake booster?

I think this behavior is fairly typical and your just over sensitive due to the nice smooth idle and new motor mounts.
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Old 11-26-2013, 05:57 PM   #6
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Quote:
Originally Posted by mdazb View Post
Well after picking up my 01 ZX3 "mechanics special" I've replaced all 3 motor mounts (completly trashed). Now it idles smooth. You have to look at the tach to make sure it's still running.

Now I noticed something while driving it today. When I'm at a stop with my foot on the brake, it's smooth. When I barely take pressure of the brake pedal, I feel a vibration. Not shaking the car but a slight vibration. Apply pressure to the brake pedal and it goes away?
Any input would be helpful
What brand of engine mounts did you use???????
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