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1990 Ford F-150 Cold start stall
1990 f150 4.9 52,000 miles. First start in the morning starts hard then dies. Second start, and truck runs fine all day. Changed IAC, TPS, PCV valve, cleaned IAT sensor, throttle body mounting gasket, and checked for vacuum leaks. Still dies on cold start.
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Comments
Running too lean – High positive fuel trim corrections can be traced to MAF and O2 sensor faults, vacuum leaks from intake gaskets/hoses, unmetered air (intake snorkel leak), clogged or dirty fuel injectors, fuel delivery issues, and exhaust restrictions like a clogged catalytic converter.