Ford Mustang 2020 Cold Start Stalling
The engine starts but immediately dies when cold, indicating a fuel or air delivery 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 to ECU
Dirty or failing idle air control valve (IAC) or throttle body carbon buildup restricting idle airflow
Weak fuel pump or clogged fuel filter causing insufficient fuel pressure during cold start
Vacuum leak (e.g., intake manifold gasket, PCV hose) leaning out the mixture when cold
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 ECT sensor and its connector for damage or corrosion.
Clean the throttle body and IAC valve.
Test fuel pressure at the rail during cold start.
Inspect vacuum hoses for cracks or disconnections.
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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.
