Q: idles rough-worse with a/c on

asked by on

car runs well but idles poorly coming back to idle after stopping, condition worse with a/c on.well maintained, all emission and electronic engine controls still original.have checked for vacumn leaks and all is well-i think!

My car has 100000 miles.
My car has an automatic transmission.

You will need to run a Check Engine Light scan. I suspect that you will have a problem with the EGR valve stuck partly open causing the internal vacuum leak and a rough idle. You can remove, clean, and reinstall the valve. If it still leaks then replace the valve.

If you need some help getting this fixed, feel free to contact a certified mechanic who can diagnose your rough idle and make any repairs that are necessary.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. idles rough-worse with a/c on

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Do any of your mechanics work on a 1972 Ford Bronco in zip code 75034 ?

Hi there. We have a few mobile mechanics in the Frisco area, so if you'd like to see if one of them could come to your location to complete an oil / filter change and top off fluids on your...

Q: Water getting into car

Hello. During it's operation, the air conditioning system will come across a large amount of condensation. This condensation gathers around the evaporator and runs off through a drain. You may see water dripping from the car on a hot summer...

Q: Vehicle idling rough once warm

This might be due to a vacuum leak. Vacuum leaks are common in older vehicles because of the age of rubber lines, gaskets, etc. The vacuum leaks alter the air fuel mixture and as the engine tries to adjust it,...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.