Skip the auto shop - Our mechanics make house calls

Q: My car is losing power while I'm driving and while ideling

asked by on

I have a rover 25 1.4 petrol impression. When I start the engine it runs at just over a 1000rpm then slowly drops down to 600/700rpm when this happens it's seem like it going to stall also when this is happening it won't rev higher then 2000rpm. Also when I'm driving the stalling part kicks in again. I wait for a few minutes then it runs fine. I've looked at the CMP,MAP,. They seem to be working. Do you have any other ideas what it could be. Thank you.

My car has 6500 miles.
My car has a manual transmission.

A: This may be a sign of a failing idle air co...

This may be a sign of a failing idle air control valve. This is a unit that is located on or near your intake manifold that monitors the air intake as it is mixed with fuel prior to being injected into the engine. This valve is controlled by the vehicle’s computer which will adjust idle speed based upon other measurements such as engine temperature, intake air temperature and electrical system load or voltage. When you accelerate, the engine RPM increases, and as you let off the gas, the RPM slowly returns to the normal idling speed. However, when the engine RPM drops below the normal range of 800 RPM (for most cars), it is more than likely that you are dealing with an IAC valve problem. In cases where this valve is clogged or is nearing its replacement age, your vehicle will stall instead of idling after the release of the throttle. I would recommend having an expert from YourMechanic come to your home or place of business to diagnose your vehicle, and replace your idle air control valve.

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

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: How much do brakes cost 2014 Range Rover sport?

Billing question sent to CS for the cost to replace the brakes on a 2014 Range Rover Sport.

Q: Runs fine for days then acts like running out of gas and then dies and try restart and runs then dies ,when I turn key on you hea

The fuel pump in the fuel tank is designed to have low pressure and high volume to feed the front fuel pump the right amount fuel. The front fuel pump supplies the engine with high pressure to the engine. When...

Q: Manual transmission won't go into any gears.

Hi there. It is possible that the transmission may have gotten into the wrong gear at the wrong time and could have damaged that counter shaft or the main shaft in the transmission. First drain the oil from the transmission...

Related articles

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 P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
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...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.