Engine Starts Then Dies Immediately
The engine cranks and starts but then stalls right away. This indicates a problem with fuel delivery, ignition, or security system that prevents the engine from staying running.
Diagnosis Details
Possible Causes
Faulty fuel pump or fuel pump relay – the pump may prime and start the engine but then lose pressure or stop delivering fuel.
Crankshaft position sensor failure – the sensor may provide a signal to start but then fail, causing the ECU to cut spark or fuel.
Immobilizer or security system issue – the anti-theft system may allow the engine to start briefly but then shut it down.
Vacuum leak or idle air control problem – unmetered air or a stuck idle air control valve can cause stalling immediately after start.
Related OBD-II Codes
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What You Should Do
Check for diagnostic trouble codes using an OBD-II scanner.
Listen for the fuel pump priming when turning the key to ON (should hear a hum for 2-3 seconds).
If no prime, test the fuel pump relay and fuse.
Inspect the crankshaft position sensor wiring and connector.
Try a second key if you suspect the immobilizer.
Clean the throttle body and idle air control valve if accessible.
Related Repairs
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Disclaimer: This AI-generated diagnosis is for informational reference only. Always consult a qualified mechanic for an in-person inspection. AutOwner is not responsible for decisions made based on this information.
