Engine Starts Then Dies When Cold
The engine starts but stalls shortly after, especially when cold. This indicates a fuel, air, or ignition issue that prevents the engine from maintaining idle after startup.
Diagnosis Details
Possible Causes
Faulty engine coolant temperature sensor (ECT) sending incorrect cold-start signal to ECU
Dirty or failing idle air control valve (IACV) or throttle body
Weak fuel pump or clogged fuel filter causing low fuel pressure during cold start
Vacuum leak (e.g., intake manifold gasket, PCV hose) leaning out the mixture
Faulty ignition coil or spark plug causing misfire on cold start
Related OBD-II Codes
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What You Should Do
Check for diagnostic trouble codes (DTCs) with an OBD-II scanner.
Inspect the engine coolant temperature sensor and its wiring.
Clean the throttle body and idle air control valve.
Test fuel pressure and check for vacuum leaks.
Replace spark plugs if due for service.
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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.
