Q: The car idles fine. It revs up but slowly drops RPMs.

asked by on

Isles fine revea up fine but when it goes down to lower the rpm it drops very slowly

My car has 140000 miles.

Hi there:

The idle is controlled by the idle control valve, mass air flow sensor, and throttle body of a fuel injected motor. Any of these components could be dirty, damaged, or have faulty wiring that is causing your engine idle to be inconsistent. In order to determine which one or combination of all of them possibly is the root source of your Ford’s issues, it’s best to have a mobile mechanic, like one from YourMechanic, come to your location to complete an engine idle is rough inspection.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  1. Home
  2. Questions
  3. The car idles fine. It revs up but slowly drops RPMs.

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: Running really rough, not starting usually. Battery light came on. Car overheated. Headlights turn off when I put the high beams on.

Hi there. With the information given, it sounds like you accidentally put 3 bottles of Gas Heet (water / antifreeze remover) into the gas tank. There is to be only 1 bottle of Gas Heet to a full fuel tank...

Q: Gas sensor not working; car stalled in intersection

The fuel tank on your vehicle is under the rear passenger seat. There are 2 fuel pumps in the tank, each with a large seal, that must be installed perfectly to avoid fuel/fume leakage. Mercedes is aware of this issue...

Q: Q: The truck will crank but it won't start

Hello. A no start condition can be caused by many things. A few common causes are a faulty fuel pump, injectors, ignition module, or even a computer. Keep in mind that the even if those components appear to be functioning,...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...