Close
QUESTIONS

RepairPal is your advocate for car care advice and guidance

Q: The idle goes up & down when stopped or moving. It is worse with the ac on. on 2001 Ford Focus

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Have replaced the idle air control valve twoce with only tempory relief. Also cleaned throttle body giving temp relief. No engine light ever comes on. What signales the throtle body to increase rpm at idle position & no pressure on the gas pedal.
LeRoy
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
Get a Repair Estimate
Guaranteed by certified locations nationwide. Learn more
RepairPal estimates are guaranteed at over 1,700 quality certified locations nationwide. Learn more
This sounds like it could be a vacuum leak, I have seen the Ford Focus engines get leaks in their PCV hose that goes from the valve cover to the back of the engine many times.

If that does not pan out, here are some shops:

https://repairpal.com/directory?address=98382&car_brand_names=Ford
I would have a qualified shop search for a vacuum leak that could be changing severity depending on engine temp and load conditions. If you are experiencing it does it change when at a stop and shift to reverse or drive?
When at a stop often the idle usually returns to 600 rpm after 20 seconds. But sometimes go up & down while stopped.
Ok, I would still suspect a vacuum leak, sometimes they can be intermittent. Have a qualified shop look at it since it sounds like it happens on a regular basis and they should use a "mechanics ear" to try and find it. Good luck.
Find Out Why Your Check Engine Light Is On
Didn't find what you were looking for?