Question about 1998 Ford Explorer

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My problem is my truck is blowing black smoke out the tail pipe and i dont know why i changed 3 ot sensors and a map air flow it is still doing it?

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Have you checked the coolant temp sensor? not the sensor for the gauge . the coolant temp sensor for the fuel injection. this sensor when cold tells your fuel injection system to add more fuel. in other words it acts like a choke in a carb. when this sensor goes bad it can send a signal constantly telling your computer the motor is cold therefor it needs alot more fuel than it realy does. also that sensor is tied into the 02,s. hope this helps.

Posted on Apr 18, 2009

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