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.

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: I have all the parts needed for rotor and pad replacement along with brake sensors - how much to install?

Sent to CS

Q: Stalling at stop lights

Hello there, a few different faults could be causing your 2000 Plymouth Breeze to stall. The most common would be the fuel pump, MAP sensor, fuel filter, battery, alternator, battery cable, or a wiring fault. To have all these items...

Q: Hesitating to go up steep grades but the transmission we got was built back in 2014.

Hi there. It is normal for a vehicle to loose power as it goes up a steep grade. It depends on how steep the grade is. If your vehicle is climbing up a 6% grade at 70 mph, then the...

Related articles

Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
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...
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.