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VX Dual Fuel (Aftermarket) DTC57 Injector Monitor Line problems

Discussion in 'VT - VX Holden Commodore (1997 - 2002)' started by V6formethx, Apr 5, 2019.

  1. V6formethx

    V6formethx New Member

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    Hi all, and thanks in advance if you are even reading this, let alone able to offer assistance.

    I have never come across and issue with these motors I haven't resolved myself, but this has me absolutely stumped after months of trying to figure it out.

    Issue:
    Engine light comes on after a short time driving every-time the car is used. Plugging in with Tunerpro RT and ALDL cable I can see that DTC57 is being triggered, the software says this is "Injector Monitor Line Fault". This happens regardless of whether the car is on LPG or Petrol.

    Symptoms:
    * Car seems to hesitate or stumble at time the light is triggered.
    * Car runs roughly on LPG and will eventually stall and or backfire.
    * Does not stall on petrol although a feeling like it is not running very smoothly is noticeable.
    * Noticeable increase in fuel consumption.

    History:
    The car has always tripped this code every so often but has always gone away after not very long without even needing to restart the car. I was told this was normal due to the LPG system and it has never produced any side effects to cause me to think otherwise.

    It started after the following work was done by me to the car:
    * Replaced injector seals that were leaking.
    * Replaced PCV Valve only because they are cheap and I had already pulled the engine down to that point so I figured I'd save the potential issue in the near future.
    * Replaced valley gaskets, both sides.
    * Replaced all vacuum lines.
    * Cleaned throttle body and intake plenum while removed.
    * All new gaskets used on everything removed.
    * Replaced both engine mounts.
    * Oil filter and oil change.
    * New spark plugs and 8mm quality leads.

    What I've Tried:
    I really want to write "everything" here as that is what it feels like, but clearly there is one resolution I haven't tried yet, the correct one! So here goes to the best of my memory.

    Switched the following with known working parts:
    * Intake Air Control Valve
    * Throttle Position Sensor
    * Ignition control module and all coil packs
    * Plugs and leads
    * Both O2 sensors (individually with test drive in-between)

    Have tested the wire identified as the injector monitor line by the service manual from end to end with no sign of altering resistance throughout car. It shows battery level voltage. I've checked all electrical connections figuring I may have knocked something that had a dicky connection already, put new connectors on multiple wires related to the LPG as a result, but the issue remains.

    Have ruled out an injector being damaged as the issue occurs on LPG still and it is actually only able to be driven on petrol.

    Have thoroughly checked for vacuum leaks everywhere but behind dash as the heater and vent controls operate fine so I ruled out any fault on the cabin side of the firewall.

    There is probably more that I'm not thinking of right this second but I will add this if need.

    Any help greatly appreciated, I fear this is literally starting to drive me insane! I have been over and over anything I touched and cant fault my work, yet it only started after doing that work and is basically telling me it has to be related, or the worlds biggest, and cruelest coincidence. No suggestion or question is considered a bad one, this is desperation at this point.
     
  2. Lex

    Lex Well-Known Member

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    Lpg filter?
    Whats your spark plug gap?
     
  3. V6formethx

    V6formethx New Member

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    I forget exactly but I can tell you they were checked against the service manual specs and the new ones were correctly set already. I then made them .2 smaller gap for the LPG. I had the issue before changing plugs but after the other work, which is a finer detail I had not mentioned. I have heard different things in regards to where to set the gap with LPG installed if you had any input? I believe it can make a reasonable difference.
     
  4. Lex

    Lex Well-Known Member

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    I think l remember reading on this forum, that different members had good out comes with 0.8 mm - 1.3 mm?
    I think also a few had good results with 1.1 mm?
    Another member changed the lpg filter with good results.
    I have noticed that you have not mentioned anything about a filter.
    The .08 mm may have been a lpg only system?
     
  5. delcowizzid

    delcowizzid on holiday

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    Dtc57 will be turned off in a vx lpg bin maybe go see a tuner and get them to flash In an lpg tune.
     
  6. BlackVXGTS

    BlackVXGTS Well-Known Member

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    The attached excerpt from the VT/VX Service Manual may help you:
     

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  7. V6formethx

    V6formethx New Member

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    If I have an interest in something, I study it until I know it inside and out. LPG I have never had an interest in so I'm blind in regards to an LPG system except understanding the electrical side of them. Bottom line..... There's an LPG filter?? The LPG was checked for the 10 year compliance about six months ago, would this have been renewed then? And will this also cause issues on petrol?
     
  8. delcowizzid

    delcowizzid on holiday

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    Post a driving log up from tunerpro
     
  9. Lex

    Lex Well-Known Member

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    No idea about the filter. Another member on this forum was having problems with his gas system & would get it serviced, & no they didn't change the filter.
    I imagine the gas problem wouldn't have an issue with petrol, unless there is more than the one issue.

    I had another quick read of the start of your thread, sorry missed the part of about running rough on petrol too.

    I suppose you have checked the injector wiring?

    You could try posting a log of tuner pro as delcowizzid suggested.

    Good luck with sorting it?
     
  10. V6formethx

    V6formethx New Member

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    I actually recorded two short drives yesterday with the plan to upload them, will do that soon. Yes, tested injector wiring and the injectors themselves, cant fault them. Problem is though it will idle all day long and not trip the code, but driving it does without fail. Can't work out a pattern with when it trips either. Not timed with bumps, acceleration or anything I can pick, seems random, but certain.
     
  11. V6formethx

    V6formethx New Member

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    Appreciate your efforts too by the way, I'm the only one of my mates or family who likes to get grease on their hands. Makes it difficult when you need the ideas bouncing back and forth to get somewhere.
     
  12. V6formethx

    V6formethx New Member

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    Couple of TunerPro logs.
     

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  13. delcowizzid

    delcowizzid on holiday

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    What adx are you using cause with my vx adx shows code 66 qdm2 3-2 downshift solenoid circuit code
     
  14. V6formethx

    V6formethx New Member

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    I saw that too the last 2 checks but its new. The trans was to be serviced until this took my attention so I have my money on either clogged filter or bad fluid on that one. I'm quite confident the trans service will fix that but I'm not sure where the original fault code has gone to, hasn't tripped last 2 drives but the underlying issue is still there. Or am I maybe looking at a dicky ECU? I'll work out women before this car....
     
  15. delcowizzid

    delcowizzid on holiday

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    57 probably triggers when you switch to lpg depending on where they cut the injector power for the lpg conversion.the issue is probably nothing to do with any error codes
     
  16. V6formethx

    V6formethx New Member

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    History:
    The car has always tripped this code every so often but has always gone away after not very long without even needing to restart the car. I was told this was normal due to the LPG system and it has never produced any side effects to cause me to think otherwise.

    Not being a smart ass quoting that so don't take as that, but unfortunately there is definitely something different going on there. I'm sure it misses slightly when the light triggers too.
     
  17. delcowizzid

    delcowizzid on holiday

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    Ok I found 1 anomaly in the log batt volts is a little bit lower than normal most vx will sit around 13.9-14v continuous but at 14:26 there is a spike to 16.5v I would have at a guess thAt the regulator on the alt may be a bit flaky or the alt itself maybe check some other logs and see if any others have any changes in battery volts using the monitor window.that would trigger the 57 code if it stayed high or low volts long enough
     
  18. V6formethx

    V6formethx New Member

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    Nice pickup, I have a known good spare and will do that in a sec. Keep you posted.
     
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  19. V6formethx

    V6formethx New Member

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    No good, changed it with no difference. :(
     
  20. V6formethx

    V6formethx New Member

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    Don't suppose anyone can post a Tunerpro recording of a VX V6 that's stock and no issues so I can compare it to mine and search for differences that may point to an issue with mine?
     

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