Engine Starts Then Dies Immediately
The engine starts but immediately stalls, indicating a fuel, air, or ignition delivery issue that prevents the engine from running after the initial start cycle.
Diagnosis Details
Possible Causes
Faulty fuel pump or fuel pump relay – The pump may provide initial pressure but fails to maintain it, causing the engine to die.
Clogged fuel filter – Restricts fuel flow after startup, leading to stall.
Mass Air Flow (MAF) sensor malfunction – Incorrect air reading can cause the engine to stall after starting.
Crankshaft or camshaft position sensor failure – Loss of signal can cause the engine to shut down immediately.
Vacuum leak – Unmetered air entering the intake can cause a lean condition and stall.
Immobilizer system issue – The anti-theft system may cut fuel or spark after start.
Related OBD-II Codes
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What You Should Do
Check for diagnostic trouble codes (DTCs) with an OBD-II scanner.
Listen for fuel pump prime (2-second whine when turning key to ON).
Test fuel pressure, inspect fuel filter, and clean or test MAF sensor.
Verify crankshaft/camshaft sensor signals.
Check for vacuum leaks using smoke test.
If no codes, suspect immobilizer or relay issues.
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.
