Engine Starts Then Dies When Cold
The engine starts but stalls shortly after, especially when cold. This points to a fuel delivery, air intake, or sensor 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
Fuel pressure regulator or fuel pump issue (weak fuel pressure on cold start)
Vacuum leak (intake manifold gasket, PCV hose) causing lean condition on cold start
Faulty crankshaft position sensor or camshaft position sensor
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 at cold start.
Inspect vacuum hoses for leaks.
If no codes, perform a fuel system pressure test and check for spark.
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.
