Generally, the first thing to check with an engine that floods on warm start is the water temperature sensor that talks to the fuel injection system. The only way the fuel injection system knows how much fuel to supply right after startup is by checking the water temperature. If the sensor says the water is cold, the fuel injection system will supply a lot of fuel. If the reading is in the valid range (just inaccurate) the computer will not recognize that the sensor is bad.
There are other possible problems, but this is where I would start. Someone needs to measure the resistance across this sensor and compare it to a chart in the manual to see if the resistance is correct for the current temperature that the sensor is seeing.
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MAF: A Mass Air Flow (MAF) sensor output that causes the PCM to sense a lower than normal air flow will cause a lean condition.
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Air Induction System: Air leaks into the induction system which bypass the MAF sensor will cause a lean condition. Check for disconnected or damaged vacuum hoses, incorrectly installed or faulty crankcase ventilation valve, or for vacuum leaks at the throttle body, EGR valve, and intake manifold mounting surfaces.
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Fuel Pressure: Perform a fuel system pressure test. A faulty fuel pump, plugged filter, or faulty fuel system pressure regulator will contribute to a lean condition.
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Injector(s): Perform injector coil/balance test to locate faulty injector(s) contributing to a lean or flooding condition. In addition to the above test, check the condition of the injector O rings.
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EGR: Check for leaking valve, adapter, or feed pipes which will contribute to a lean condition or excessive EGR flow.
Reviewing the Fail Records vehicle mileage since the diagnostic test last failed may help determine how often the condition that caused the DTC to be set occurs. This may assist in diagnosing the condition.
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