Engine Starts Then Dies Immediately
The engine cranks and starts but stalls right away, indicating a fuel, air, or security system issue. This pattern suggests the engine gets initial fuel but loses it or the immobilizer cuts power.
Diagnosis Details
Possible Causes
Faulty fuel pump or fuel pump relay – fuel pressure drops after start, causing stall.
Clogged fuel filter – restricts fuel flow, engine starves after initial start.
Immobilizer system issue – key not recognized, engine starts then security system shuts it down.
Vacuum leak or dirty idle air control valve – disrupts air-fuel mixture at idle.
Faulty crankshaft or camshaft position sensor – engine loses timing signal 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 relay and pump.
Inspect fuel filter for clogging.
Try a second key to rule out immobilizer.
Scan for trouble codes and check for vacuum leaks.
If no codes, clean throttle body and idle air control valve.
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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.
