check engine light on

Discussion in 'International Forum' started by trucker359, Sep 15, 2013.

  1. trucker359

    trucker359 Bobtail Member

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    Sep 15, 2013
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    I have a 99 IH 9400 with a 3406E last 3 days has check engine light on and off and truck cant go any faster than 55mph when loaded. empty goes 60.. anybody has a clue?
     
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  3. GrapeApe

    GrapeApe Road Train Member

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    Jan 7, 2013
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    Pull the flash codes and let us know what you get. With the cruise off, hold the resume button until it flashes out 2 digit codes.
     
  4. trucker359

    trucker359 Bobtail Member

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    Sep 15, 2013
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    it gives me a code 26
     
  5. GrapeApe

    GrapeApe Road Train Member

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    Jan 7, 2013
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    Double check that it is code 26. I say that just because it's easy to miscount and you don't want to waste time and money going in the wrong direction.

    26 is a barometric sensor fault. It could be wiring, or a failed sensor. The sensor should be in the left side of the engine right next to the oil pressure sensor. Unplug it and look for corrosion in the plug. Give each wire a good tug to make sure they have a good connection. If any wires pull out, you need a new plug end.

    To properly diagnose, you'd need a diagnostic program, but if the plug and wiring look OK, a new sensor is worth a shot. You'll pay more for a shop to diagnose than the sensor costs.
     
    trucker359 Thanks this.
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