Engine Starts Then Dies When Cold
The engine starts but immediately stalls when cold, indicating a problem with fuel delivery, ignition, or air intake during cold start conditions.
Diagnosis Details
Possible Causes
Faulty engine coolant temperature sensor (ECT) sending incorrect signal to ECU, causing improper fuel mixture.
Dirty or failing idle air control valve (IACV) or throttle body, preventing proper idle after start.
Vacuum leak (e.g., cracked hose, intake gasket) causing lean condition when cold.
Weak fuel pump or clogged fuel filter not maintaining pressure during cold start.
Faulty ignition components (spark plugs, coils, wires) failing under cold conditions.
Related OBD-II Codes
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What You Should Do
Check for diagnostic trouble codes (DTCs) with an OBD-II scanner.
Inspect coolant temperature sensor readings and compare to actual engine temp.
Clean throttle body and IACV.
Test fuel pressure and check for vacuum leaks.
Replace any faulty sensors or components as needed.
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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.
