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Car Shaking Problems
Chevy Blazer

What causes a car's front end to shake not vibrate at idle?


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Answered 2015-07-14 14:59:14

More details would help. Sounds to me like your engine is running with fouled plugs during idle. , EzForJesus

* If it is shaking and rattling check if the engine rocks back and forth when you put it in reverse and then into drive, if so your motor or transmission mounts are worn/broken. If your engine does not rock back and forth, drive around and check to see if there is considerabe loss of torque and horsepower, if so get a free OBD code scan (avail. at most auto part stores.) OBD can detect engine misfires and other problems that could cause shaking. It could also be a bad air filter, bad spark plugs, bad fuel injector, or a problem with the throttle body.

*I'm reading your question as the front end shakes WHILE DRIVING, but not vibrate at idle. Tires are the most common cause of this.

For a low speed shake:

Either a belt inside the tire fails, or there's some separation in the tread area, or there's a 'bubble' in the tire causing the condition. Sometimes, it's just lug nuts that are left loose. All these conditions are dangerous, as a blowout is usually the end result.

For a shake at high speeds:

Usually this is caused by tires being unbalanced. At certain speeds the shake really is noticeable. Rotating your tires from the front to rear will usually identify that problem. (An unbalanced tire in the rear bounces, but the suspension will usually minimize the feel inside the car.)

This may also be caused by severely worn components: ball joints, steering arm, tie rod and tie rod ends. If these components are bad enough to cause you to feel the vibration inside the car, it is too dangerous to drive at that point. Complete loss of control (one or both front wheels not responding to the steering) may result.

My guess would be a misfiring cylinder or worn engine mounts. A fouled plug or bad wire will obviously interfere with normal combustion, and this will cause the car to shake fairly violently and run very rough. Your cars onboard computer may detect the misfire and set the check engine light.

From personal experience, my Honda Civic '97 when I was about to get on the freeway all of a sudden it started to shake really badly. When I started to drive, it was fine. The check engine started flashing every few seconds so I pulled off the freeway to go to a parking lot. I had to stop at a light and again it started shaking violently. It was definitely not a normal engine vibration when sitting at idle. When I took it to the shop and they had looked at it, they said a plug on one of the cylinders had eroded. They explained that the reason why it started shaking was that it went to a 4 cylinder to a 3 cylinder vehicle. That was just my experience with a shaking engine at idle but I'm sure there could be a multitude of reasons on why a car would shake more than normal. .

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