If the engine mounts are worn, or the engine is not idling at the proper setting, that can cause vibration at idle speeds.
Also, your shocks/springs could be worn and that could be a contributing factor as well.
The smoothness of idling in a car depends on several aspects: first, it is very important to have the power pulses coming from every cylinder as equal as possible and produced at precise intervals. Therefore, if a given cylinder is firing poorly due to a worn, misadjusted or dirty spark plug, or a defective ignition cable, or even a defective distributor cap and rotor; will result in a shaky engine. The timing was established by the distributor in older cars, therefore a worn distributor shaft bearing can produce vibration at idle. But not only the ignition can produce unevenness, differences in carburation or injection also cause a shaky engine; thus, in a two (or four) barrel carburetor, you have to carefully adjust BOTH sides of the carburetor to avoid a shaking engine. A partially or totally clogged fuel injector also results in a shaking engine.
The valve train can also produce an uneven idle, if for example, a certain cylinder valve is sticking, or the valve lifter is not working properly, unevenness will result.
Lastly, there could be some other rare cases of rotational unbalance, like fitting a wrong type of rotational or torsional Damper. (Ford made their 302 CI engine in TWO different crankshaft configurations, so that there were TWO distinct dampers available, installing the wrong one caused vibrations specially noticeable at idle, same for the flywheels, there were two of them for this engines).
Now, with an 8 cylinder engine, almost perfect cylinder balance can be achieved, less so with 6 and 4 cylinders engines. In recent 6-Cyl engines, the idle quality is established by the proper filtering of the unbalanced pulses by the advanced design of the engine mounts, which are very important in these cases. In four Cylinder engines, some Chrysler engines use a couple of balancing shafts to counteract the unbalanced character of a 4-Cyl engine, achieving a smoother idle. If those shafts, which are driven by a chain are not properly assembled, shake will be produced.
Fast idle motor is not working. This is allowing the idle to fall below the threshold of what it should be when the A/C is on.
The most probable cause would be the idle control on the engine. When you put a car in gear, there is a "load" put on it (the transmission is using power) and the idle speed normally drops. The idle could be dropping to the point where it becomes unstable and causes the engine to vibrate.
What causes a car to idle good and run rough when you give it gas?
I would look for a vacuum leak.
loud, and shety muffler
could be a broken engine mount.
It is idling. This is hard for an engine to do smoothly.
most likely the cv joints are finished
Could be time for a tune up.
That is about your average idle RPM. It depends on what car you have and the age of your car. If it bothers you, i'd recommend going to a place that fixes cars.
Timing belt. misfiring engine
check the idle speed with the car in gear, if it has a tac on the dash it should idle in gear at about 700 rpm if its too low the car will vibrate or stall.
the thermal energy is what causes the particles to vibrate.
That doesn't make any sense. But if your car vibrates at idle and stand still, then you probably have a fuel delivery or ignition problem that is causing a misfire.
change your fuel filter, it could be plugged.
Because the engine is running. Shut it off or give it gas and it will not idle.
Unbalanced tires, warped rotor, bad engine mount, bent drive shaft, bent wheel, bad wheel bearings, bad U-Joint or CV joint, or your car might have a rough idle.
The most common cause is tire out of balance or bent wheel.
When the ac is running the idle should be raised to compensate for the extra load. If the idle isn't rising then the car will cut off.
Take it to auto zone and hav3 the codes read for free.
Problem is related to idle solenoid. As you come to a stop the throttle closes. There has to be a bypass to allow air to flow into the engine. This is acheived via an idle solenoid valve located somewhere to the intake manifold and it is controlled by the computer.
If the car is starving for fuel or air (low power at idle), the car will stall while turning.
Hitting the drum causes the skin to vibrate and it makes a sound.
Adding heat causes gas molecules to vibrate, increasing the gas volume or pressure. A car with a damaged valve will usually vibrate noisily while operating. Tuning forks are designed to vibrate and thereby create a particular pitch.