If you have a bad vacuum leak, the air fuel ratio will end up being way too lean (too much air) which could cause the vehicle to stall. This throws off the expected air fuel ratio and causes the vehicle to run lean. 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.
Many electrical issues of this nature are possible to test for using a multimeter. 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. 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. If you’ve attempted to start the vehicle a couple times without success, you should avoid trying again so you don’t burn out the starter or flood the engine you don’t want to risk making more problems for yourself. 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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