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2001 ford bi-fuel ford acting up

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  • 2001 ford bi-fuel ford acting up

    Ok guys a need some expertise. My prettiest freezer truck a f-150 bi-fuel refuses to act right on cng.
    It has about 165,000 miles. We flushed the system, changed the coil overs, new plugs and it appears not to be sucking air anywhere. I put 2 fully operational compuvalves on to no avail. It runs great on gasoline and terrible on cng. Recently the catalytic converts melted, we cut the front 2 and replaced the back 2.
    Any thoughts

  • #2
    Re: 2001 ford bi-fuel ford acting up

    Originally posted by cngpizza View Post
    It runs great on gasoline and terrible on cng.
    Define "terrible" ...

    John


    “Innovation is driven by having access to things.” -- Gleb Budman, CEO of backblaze.com

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    • #3
      Re: 2001 ford bi-fuel ford acting up

      Is it throwing any OBD codes, check engine light, etc.? If the cats have melted you probably are running lean. I would suspect a clogged CNG injector causing a starved fuel condition.

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      • #4
        Re: 2001 ford bi-fuel ford acting up

        Electric Tank Valve, Dirty/clogged Coalescing Filter, Does the alt-gas switch light blink on and then go off?

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        • #5
          Re: 2001 ford bi-fuel ford acting up

          Thanks for Replying!
          Codes are as follows.
          Sensor 1 bank 1 no activity
          oxygen sensor signal biased stuck rich bank 2 sensor 1
          oxygen sensor biased stuck rich bank 1 sensor 1
          bank 2 sensor 1 no activity
          hopefully this gives enough info.
          Tanks appear ok
          filter new and has been flushed
          alt-gas not blinking
          2 good compuvalves offers the same result

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          • #6
            Re: 2001 ford bi-fuel ford acting up

            Originally posted by cngpizza View Post
            Codes are as follows.
            Would you by chance have the actual "P" codes generated?

            As John and MGM have pointed out, obstructions will induce a lean condition as will a stuck open EGR valve. As you might know, with it in an open state, it creates a lack of oxygen in the exhaust. Since the re-circulating exhaust has all its oxygen already burnt, the ECM will see a rich signal and it will try to correct with a lean command to try and lower the O2 sensor’s high voltage signal.

            However. Ford always states that before you try and troubleshoot bi-fuels, make certian that the engine runs normal on gasoline first. Which you have indicated it does so that is why I asked you to define "terrible". Does it buck and jump? No power? Idles rough? Stuff like that ...

            John


            “Innovation is driven by having access to things.” -- Gleb Budman, CEO of backblaze.com

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            • #7
              Re: 2001 ford bi-fuel ford acting up

              Hello for the codes on your truck if you had cleared all codes and these are just from CNG and no code poped up on gasoline!!
              you have one or more injector stuck open or CNG controler injector drivers stuck. Or the CNG temp sensor is seeing it is very cold and adding fuel when it should not.
              If there was a problem with wiring to O2 or sensors it would pop codes on gasoline.
              A cat can melt from beng plugged and under load melt down but it can lightup from to much fuel being dump into it and melt.
              I have never seen a cat melt from to lean NO FUEL TO BURN just how it works.
              Bob Mann

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              • #8
                Re: 2001 ford bi-fuel ford acting up

                Thanks for the idea's, Currently on CNG, it idles rough and has no power.
                Bob

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                • #9
                  Re: 2001 ford bi-fuel ford acting up

                  Has anyone checked it with at 5 gas analyzer?
                  Put the numbers into the Lambda calculator (which you can get from IATN,net under resources). You will have to join if you are not a member. It is free and there are some good resources. What natural gas is under the heavy duty forum-- when there is some

                  It will give you an idea of where the system is really running, then you can go from there.
                  You might try in on gasoline to see if the system is running close to lambda (14.7:1). Remember CNG has a different Lambda (16.2 :1 depending on fuel composition) than gasoline.

                  Hope this helps

                  Larrycng

                  I tried to down load it to chat bunt couldn't

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