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An erratic idle with air conditioning (AC) engaged can occur due to several reasons. The additional load from the AC compressor can strain the engine, causing fluctuations in RPM if the idle speed is not properly adjusted. Other potential causes include vacuum leaks, a dirty or malfunctioning idle air control valve, or issues with the engine management system affecting fuel delivery and air intake. Regular maintenance and diagnostic checks can help identify and resolve these issues.
What else can I help you with?
Why is the idle erratic with AC on in 94 Honda Accord?
mainly because your fast idle setting is not adjusted corectly when you turn a/c on, your engine should run a little higher to make up for the added load of the a/c compressor
Why does the ac work when parked but when you drive your car it blows hot then cold and idle goes up and down?
Many ac systems use engine vacuum to operate the ac controls. You may have a cracked or disconnected vacuum line that feeds the HVAC system. Check the vacuum lines under the hood, that is where they would most likely be damaged. A vacuum leak would also be the cause of the erratic idle.
Will a idle air control valve make the car miss?
Unlikely. A faulty IAC will give you poor, erratic idle speed.
Ford erratic idle?
Air Leak or hose has come off from MAP sensor
Will a blown head gasket cause erratic idle?
I blown head gasket can cause an engine miss which one cause a rough idle.
What does a Idle speed control solenoid do?
The idle speed control solenoid controls the idle of the engine when the air conditioning is engaged. Since the ac pump draws down the engine idle the solenoid increase the idle when the ac is on.
What will cause 1993 Pontiac grand am to idle up and down while in idle?
Pontiac 1993 vehicles have been known to have Fuel Pressure Regulators that when they fail, they will release too much fuel to the intake and therefore produce erratic or Idle up and down. Also, the erratic Idle can be caused by a air pressure leak located as part of the Emissions system.
How to you fix erratic cold idle on 95 civic 1.6 vtec that quits after 5 to 10 min of warm-up?
If there is an erratic cold idle the car could be experiencing a vacuum leak. Check all the air hoses on the vehicle and replace what is worn. Improper air pressure will lead to an unstable idle.
Why does your 04 wrangler auto 4.0L idle weird?
erratic idle can most times be tracked to a vacuum issue, check all your lines for leaks
What causes erratic idle when shifting to reverse?
might be bad motor mount / or electrical short
What causes Altima stalls at idle with the ac running?
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.
What can cause the car to stall when running the ac?
An engine usually has a higher idle speed when the ac is running. If the high speed idle does not operate then the ac will cause the engine to stall.
