Q: Car idles fast when stopping.

asked by on

Hi all. I have a Ford Focus ST170/SVT and whenever I pull up to a stop the car idles to around 1800rpm for about 3-4 seconds then drops to normal idle around 1000rpm. I have replaced the idle control valve, cleaned the MAF and throttle body and checked for vacuum leaks by spraying brake clean while idling with nothing found. I also have an issue with the car missing at higher revs and have removed the Intake Runner Control Module and cleaned the contact and tried to fasten the spring/cable inside as it was loose. I am about to check it again as it has reverted back to occasionally missing again. Your thoughts and advice would be greatly appreciated. Mark from New Zealand.

My car has 74000 miles.
My car has a manual transmission.

Hi there:

It looks like you’ve inspected all the normal suspects of a high engine idle situation. One issue that pops up occasionally; especially on early 2000 period cars, trucks and SUV’s is due to a faulty radiator coolant temperature sensor. When the sensor detects that the engine is running cooler than it should, it can trick the ECM into increasing the engine RPM as it does in order to warm up the vehicle. This is why the idle will be higher for a few seconds after you come to a stop. However, it can be multiple other electrical issues as well. The best way to know for certain is to have one of our local YourMechanic technicians complete an inspection in regards to you engine idle at high speed.

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. Car idles fast when stopping.

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: shifter stuck in manual mode after accident

Without body damage, it is most likely a coincidence that it is stuck in manual mode. Regardless of how it came to quit working, it should be diagnosed just as any other failure would be. I would begin with...

Q: My car keeps stalling. What causes this?

This may be related to a dirty or failing idle air control valve. The idle air control valve reads the air intake as it is mixed with fuel prior to being injected into the engine at low speeds and at...

Q: 2013 Dodge dart ignition won't release key

This problem is reported for this model, by other consumers, in the NHTSA database. Some reported fixes have involved removing power from the battery as a "re-set". Also, sometimes an improperly adjusted shift cable is the cause. There is usually...

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...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...