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F150 cng light turns of after 5 seconds- dtc p1640,

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  • F150 cng light turns of after 5 seconds- dtc p1640,

    I work at a CNG Auto dealership in Tulsa, I do a lot of CNG work but i have a new problem, 2001 f150 bi fuel - fuel switch light goes out in 5 seconds, service eng light is p1640 dtc. so I took compuvalve and put it in a different f150 an it worked fine,I put it back in the original truck and on first start worked great on cng, shut it off and on re-start it goes out in 5 seconds, all is well on gas. P1640 seems to have a few meanings depending on what you read or who you talk to. Has anyone had this problem and a guess of where to look? HELP!! Thanks, ** tank is full, switch circuit board and fuses are good, tank valve working fine. .........

  • #2
    Re: F150 cng light turns of after 5 seconds- dtc p1640,

    No replies to my post, whats up do I have coodies? This site is hard to work with, why does it restrict me constantly and is so difficult to use?

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    • #3
      Re: F150 cng light turns of after 5 seconds- dtc p1640,

      The Ford guy ( cnghal ) has not checked in for awhile . Everyone else seems to run when the word compuvalve comes up.

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      • #4
        Re: F150 cng light turns of after 5 seconds- dtc p1640,

        Well they arnt that scary Any how this turned out to be a damaged wire in the main compu valve plug, it would set off p1640 All fixed, billed out and paid

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        • #5
          Re: F150 cng light turns of after 5 seconds- dtc p1640,

          I think the compuvalve is very scary. Not scary in regard to safety but scary that one will go out on you and your out of luck - can't easily get them and very expensive when you do find them. Just an opinion.

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