Free Car Repair Advice by Professional Mechanics
Troubleshooting
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Engine Vibration
Engine Vibration at Idle
The engine in your car is designed to run balanced to minimize vibration to
the passengers. Vibration is the most noticeable when the engine is at an idle.
Several components are designed to help minimize engine vibration. We have
listed some of the most common problems and repairs below.
Troubleshooting Procedure
- Engine mounts are used to minimize
engine vibration by isolating the
engine from the car frame. These mounts are constructed by using rubber
vulcanized between to metal plates with threaded studs that bolt to the
engine and the frame of the car. When motor mounts become worn they allow
the engine the contact the frame causing a noticeable vibration. Inspect the engine
mounts for integrity, look for any oil, cracks or separation
of the mount. Remove the failed engine mount and replace if needed. For
exact instructions how to replace the engine mounts in your vehicle consult an
auto repair
manual.
New Engine Mount (appearance will vary)
- A balance shaft belt is used inside some designs of engines to counter
act vibration created by the natural engine operation. Many balance shafts
are operated by a timing belt that can break or become out of correlation
with the engine either by a worn timing belt or misalignment when replaced. To
inspect for this problem, remove the timing belt cover and inspect timing
belt marks for proper alignment. All engines are different, consult a car
repair manual for exact belt alignment specifications.
- An engine depends on an equal compression reading in each cylinder. If
poor compression
exits in one or more cylinders it can cause a rough idle condition. To check
for this condition perform an
engine
compression test to compare readings. Once a low cylinder has been
detected addition internal engine inspection is required.
For exact specific repair procedures for any of the steps above visit our
online repair
manual page.
Troubleshooting
/
Engine Vibration
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Engine Vibration
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