Skip the auto shop - Our mechanics make house calls

Q: Car cutting out when slowing down

asked by on

Recently bought my car and within the first few days I had the MAF and secondary air pump replaced. My car has an intermittent fault we're it cuts out when I slow down to under 20mph when it's warm. Slowing down for bends, traffic or traffic lights. It could be potentially very dangerous. No other faults are coming up on the diagnostics. Any help will be much appreciated. Thanks in advance.

My car has 95000 miles.
My car has an automatic transmission.

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 idle. 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. This is all controlled by the idle air control valve. When the engine RPM drops below the normal range of 750-800 RPM (for most cars), this often times will cause the engine to stall indicating a dirty or faulty idle air control valve. I would recommend having an expert from YourMechanic come to your location to diagnose and repair 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: Engine surging and has a loud noise in Sport mode.

Hi there. Check the idle air control valve (IAC) and see if its working. The IAC controls the engines idle and operation. If the engine is surging, then there is a good posability that the IAC valve may not be...

Q: 2016 new car with coolant hoses broke and car overheated

If you are located in the United States and you have bought a brand new car covered by a manufacturer's warranty, Federal and State "lemon laws" protect you in the event that a fault with the car is not repaired...

Q: ESP stability control light is on.

Hi there. If the vehicle was jolted hard on the front end when the vehicle hit a pole, then the Electronic Stability Motor may have had a harsh force applied to it causing the motor to either fail or become...

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...
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...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...