Engine Starts Then Dies Immediately
The engine cranks and starts but stalls right away, indicating a fuel, air, or ignition delivery issue that prevents the engine from staying running.
Diagnosis Details
Possible Causes
Faulty fuel pump or fuel pressure regulator – not maintaining pressure after start
Dirty or failing idle air control valve or throttle body – restricts idle airflow
Crankshaft position sensor or camshaft position sensor failure – loses sync signal
Vacuum leak – unmetered air causes lean stall
Faulty mass airflow sensor or intake air temperature sensor – incorrect air/fuel mixture
Security/immobilizer system issue – cuts fuel or spark after start
Related OBD-II Codes
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What You Should Do
Check fuel pressure at the rail; if low, test fuel pump and relay.
Inspect and clean throttle body and idle air control valve.
Scan for diagnostic trouble codes (DTCs) to identify sensor or system faults.
Check for vacuum leaks using a smoke machine or propane.
Verify immobilizer key recognition.
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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.
