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1994 Ford Bronco Question: at first start up it will run ok for a bit then start to miss.

 

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SHELLMT, 5.8L V8, Thermopolis, WY, August 07, 2013, 15:00
 Rookie

if you try and drive it when you accelerate it with fall all over itself then take off. if just driving it miss out until it get warmed up it runs good. any ideas? changed ignition module.

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  • Answer #1

    mrfordman August 08, 2013, 07:37
     Journeyman

    did one a while back, had a bad engine coolant temp sensor. showed -40, would run rich no power till warm.

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    SHELLMT, August 09, 2013, 08:21
     Rookie

    Checked that it is reading right, also check air temp sensor reading the same as water temp.

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    mrfordman, August 09, 2013, 08:48
     Journeyman

    does this have a map sensor or a mass air sensor?

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    SHELLMT, August 09, 2013, 09:21
     Rookie

    IT HAS A MAP SENSOR AND WHEN IT STARTS TO STALL OUT IT SOUNDS LIKE IT IS LOSSING AIR. YOU CAN HEAR IT SUCKING REAL HARD THRU THE AIR CLEANER INTAKE. If I remove the vacuum line from the MAP sensor it runs better, have changed MAP sensor didn't help. the o2 sensor reads rich changed it no help still reads rich. have codes 113, 126, 173, 212, 543, 556, I am wondering if it not a PCM problem

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