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Probably insufficient idle speed. Most have a compensator to increase idle when it's turned on, use a tach to check.
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Most modern cars have an Idle Air Control (IAC) to control idle, and the computer handles it automatically. Some older cars, such as the 84 Caprice Classic, had an adjustable solenoid that stepped up idle when the compressor was on. If yours is one of these, make sure that the solenoid is extending when it should. In the case of the Caprice, it could be adjusted by turning the shaft via the nut on the end, but you should check your shop manual just to be sure.
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∙ 13y ago
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What causes car to vibrate when ac is running but only when in idle?
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.
What causes a car motor to vibrate?
could be a broken engine mount.
What causes a car to vibrate when at stop light?
loud, and shety muffler
Will car make a noise if too much oil is in the ac?
The AC system will vibrate, and pressure throughout the system will be extremely high.
What causes a car vibrate at light stop?
It is idling. This is hard for an engine to do smoothly.
What causes a car to vibrate in stop light?
Could be time for a tune up.
What causes your car to vibrate at 80 km?
The most common cause is tire out of balance or bent wheel.
AC reduce's car performance?
only when it is on, it causes slow acceleration
What is a sentence using the word vibrate?
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.
Do plug tires causes the car to vibrate?
If the tires are properly balanced plug tires should not cause a vibration.
What causes a car to shake and vibrate when accelerating up to 70 or better?
Normally a bent wheel or tire out of balance.
Mechanical waves are created when a source of energy causes a medium to?
it cause it to vibrate!
