Engine Starts Then Dies When Cold
The engine starts but stalls shortly after, especially when cold. This indicates 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 enrichment signal
Dirty or failing idle air control valve (IAC) or throttle body carbon buildup
Weak fuel pump or clogged fuel filter causing low fuel pressure during cold start
Vacuum leak (intake manifold gasket, PCV hose) leaning out the mixture
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 connector.
Clean the throttle body and idle air control valve.
Test fuel pressure at the rail.
Inspect vacuum hoses for leaks.
If no codes, perform a smoke test for vacuum leaks.
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.
