Skip the auto shop - Our mechanics make house calls

Q: My car wont stay on

asked by on

My car was idling bad and my transmission was racing when I step on the gas and I had a check engine sign I heard that the filter could be cleaned and problem solved while I was cleaning it the plastic housing around the valve broke but I put it back on the car still and from that the car wont start if it does then after a few seconds it shuts down
My car has an automatic transmission.

A: This may be related to a dirty or failing i...

This may be related to a dirty or failing idle air control valve. The idle air control valve monitors 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 may indicate a dirty or faulty idle air control valve. In cases where this valve is dirty or failing, your vehicle may stall instead of slowing to an idle after the release of the throttle. I would recommend having an expert from YourMechanic come to your location to diagnose and repair your idle air control valve so that this can be resolved.

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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: Car won't start

Hi there. The alternators primary job is to power electrical component once the car has been started, so it usually has not part in the actual starting process. If you are able to turn the key and the engine cranks...

Q: Does the main relay also affect the turn signals?

Hi there. It sounds like you may have blown a fuse during your repair of the main relay. Check all your fuses and relays and replace them as necessary. Then, using an electrical wiring diagram, verify that the wiring harness...

Q: Heat gauge problem

The temperature fluctuation when turning on and off the heat suggests that you may have an overheating issue. The thermostat is a more commonly known part to fail when it comes to an engine overheating. I would recommend having the...

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...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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...