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The O2 sensor is BAD and needs to be replaced. Whats happening is when the engine is cold the sensor sends an air to fuel mixture signal to the computer that satisfys the engine's requirements at start, but when the engine heats up the sensor then send a leanner mixture (To much Fuel) that the engine can't burn off so the Sparkplugs get wet and misfire stalling the engine.

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โˆ™ 2005-02-05 12:31:05
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Q: Why would the engine stall when it heats up in a 4WD 1991 Ford Explorer?
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