![]() ![]() 2) Bad Vacuum LeakĪ vacuum leak is a hole in a vehicle’s air intake system behind the mass air flow (MAF) sensor that allows unmetered air into the engine. If the root cause is an electrical problem within the idle air control valve itself, you will likely have to replace the IAC. You can use a multimeter along with a factory manual’s wiring diagram to test the idle air control valve. Sometimes there is an electrical issue inside the idle air control valve that prevents the valve from operating properly. You can try cleaning the idle air control valve to see if it resolves the problem. This is a very temporary solution, but it could mean the difference from being stranded and getting safely to your destination. If you have a bad idle air control valve, you can often keep the engine running by giving it gas. When the idle air control valve malfunctions, you may experience a rough idle or the vehicle may stall entirely. It also manages the idle under changing engine loads, like when you kick on the air conditioning, turn on the headlights, or turn up the radio. 1) Bad Idle Air Control ValveĪn idle air control valve (IAC) regulates the air fuel mixture of a vehicle at idle. You don’t want to risk making a small problem worse if the issue ends up being a simple fix. This gives the starter a chance to rest, and may reduce the risk of flooding the engine. If you’ve attempted to start the vehicle a couple times without success, you should wait a few minutes before trying again. There are many reasons why your car would start and then stop immediately. 5) Bad Camshaft/Crankshaft Position SensorĬommon Reasons a Car Starts Then Shuts Off.Common Reasons a Car Starts Then Shuts Off. ![]()
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