Skip the auto shop - Our mechanics make house calls

Q: When the rover is cold, the idle is steady, but when it gets cold, the idle changes. I have to keep my foot on the gas and brake

asked by on

When the rover is cold, the idle is steady, but when it gets cold, the idle changes. I have to keep my foot on the gas and brake or else the Rover will die

My car has 135000 miles.
My car has an automatic transmission.

Hi, thanks for writing in. I’d be happy to help.

This is a case of an idle air control valve not working properly. An idle air control valve literally bypasses air around a closed throttle plate so the engine can get air at idle. Because it bypasses air, it’s also called an air bypass valve. On start-up, the engine control module (ECM) or powertrain control module (PCM) checks engine coolant temperature, ambient air temperature, barometric pressure (on some engines) and then determines how much air and gas is required to start the engine. The idle air control valve works at idle and during deceleration-- in other words, any time you take your foot off the pedal. During deceleration, the computers on most fuel injected vehicles perform a “fuel cut” procedure where the the fuel injectors are forced to cut fuel to the engine resulting in RPM drop. However, since the pistons are still moving up and down, the engine still needs an air supply. The idle air control valve opens during deceleration to provide that air. This appears to be the problem you are experiencing.

If you would like help resolving this idling issue, consider having an expert automotive technician from YourMechanic come to your home or office to inspect your vehicle for you, and make any repairs as needed.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 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
  1. Home
  2. Questions
  3. When the rover is cold, the idle is steady, but when it gets cold, the idle changes. I have to keep my foot on the gas and brake

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: I have a P2771 code.

This code may be the result of a malfunctioning selector switch or an electrical problem within the circuit. The fault may not necessarily be in the transfer case itself, but the electronics can be tested. Consider hiring an experienced technician...

Q: How much would it cost to convert a 98' range rover from air suspension to spring suspension?

The cost of conversion varies depending in part on where you purchase the conversion kit from. I suggest finding a kit with all the components needed rather than piecing it together. Cost will also vary depending on the quality of...

Q: Remove reinstall heater core

Hello there, thank you for asking about your 1990 Geo Storm. Your best option would be to purchase a service manual for your year model. The entire instrument panel must be removed in the process as well as many other...

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...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
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.