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1994 Ford Bronco Question: want to die

 

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SHELLMT, 5.8L V8, Thermopolis, WY, August 14, 2013, 14:26
 Rookie

when you first start the engine it runs good, after it go from fast idle to idle it will run ok for a bit and then wants to die. it sounds like it is gasping for air. If I unplug the MAP sensor it goes to high idle and runs ok, but when I plug in back in it want to die again. have changed MAP sensor, O2 sensor and ignition module. any other ideas?

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  • Answer #1

    Tbone1980 August 14, 2013, 20:36
     Journeyman

    Try cleaning out the throttle body, also your IAC valve maybe not working correctly, may also want to check coolant temp sensor as well, check coolant level also..

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    SHELLMT, August 15, 2013, 11:18
     Rookie

    I have done all of this, I did a slow code koeo test and good a bunch of different senor codes, it it be an ECM problem?

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    Tbone1980, August 15, 2013, 19:13
     Journeyman

    that could be right but , try cheching all of the body grounds first, trace the wire harness and you shuold be able to find them there are usually several different ones throughout the engine bay, if you have a repair manual it would help to find them..usually when you have multiple sensor codes at the same time is caused by faulty groud circuit, they could just be rusty or corroded and not getting a good connection

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    SHELLMT, September 06, 2013, 14:24
     Rookie

    I finally found the problem, the O2 sensor wires run down the positive battery cable and the acid with eat at the wires. replaced the wires and rerouted them away from the battery cable and it works good now. thank you and I hope this might help someone else

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