Question about 1990 Ford Ranger SuperCab

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My 1990 ford ranger when the motor is cold it runs fine but when it warms up it spits and sputters so bad it barley runs

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Could possibly be the temperature sending unit. They tell the computer what the coolant temp is. When the engine is cold, it will richen the air fuel mixture. IT could possibly not be sending the right signal to the computer, thus causing it to run crappy.

Posted on Oct 07, 2009

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Check the egr valve. Then the O2 sensor(s). When it warms up it goes into "closed loop" using the O2 sensors..if bad it will run lean or rich or hunt for both.

Posted on Oct 07, 2009

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