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cng and gas at same time

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  • cng and gas at same time

    Anybody out there ever see this one before?99 f-250 bi-fuel If the cng tank is plugged in turn the key on and the tank valve opens no matter what position the switch on the dash is in when it starts it obviously is running on both fuels unplug the tank and it runs like a dream. In 99 ford had a vcl (vehicle communication link) after 99 it is integrated into the compuvalve. There were U codes present in the memory for a commucation problem (u1262,u1147) but cant find any info on these codes anywhere. any other suggestions???
    Last edited by flowersbutts; 03-16-2009, 06:57 PM.

  • #2
    Re: cng and gas at same time

    I was able to get (thru an act of congress) the full wiring schematic from ford, and have now narrowed it down to either the vcl or the compuvalve but cannot find any test procedures for either with this condition any other suggestions?

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    • #3
      Re: cng and gas at same time

      U1262: No messages received from PCM (no messages for more than 5 seconds)

      I could not find U1147 in the quick search that I did, hope that helps ..


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