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Ls1 gas troubles

Discussion in 'General Discussion' started by LX8Adventura, Feb 11, 2019.

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  1. LX8Adventura

    LX8Adventura New Member

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    Hi all.

    Just after som help. My vz adventra ls1 motor is dual fuel. Recently it's been running rough at idle, fine while accelerating and cruising. It idles fine whilst on petrol.

    Any help would be greatly appreciated.
    Cheers
     
  2. sleepa

    sleepa Shiny...

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    I might be able to help, I used to have an LS1 on LPG. And a few other LPG cars.
    Could be a few things. LPG is super sensitive so it could be perfect on petrol but run like a dog on gas.

    First I assume it is a Vapour injection system, or Liquid injection system as I don't think it was even possible to run a mixer system on these engines.

    1/ I would start with spark plugs and spark plug leads, LPG is much more sensitive to minor issues then petrol is. If you have a spare set (or even 1 lead ) change them out and see if it makes a difference.

    1.5/ Make sure the Spark plugs are suitable for LPG and also run AT LEAST 10mm spark plug leads.

    2/ Also check the air filter for the same reason as above

    3/ LPG filter could be due for replacement and/or gas system serviced.

    4/ The LPG could need a retune.

    And while you are at it, make sure all then intake side is clean (not oily or anything), from air box to throttle body.

    Good luck with it.
     
    Last edited: Feb 11, 2019
  3. LX8Adventura

    LX8Adventura New Member

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    Thank you for replying.
    I have had the 10 year tank inspection done in November. The converter, solenoid and liquid filter was replaced 6 months ago. I havent replaced the gas filter as of yet. Plugs and leads done about 9 months ago. The air box is all good. Can any mechanic tune it or do i go to someone who specializes in gas?

    Cheers
     
  4. EYY

    EYY Well-Known Member

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    No, not just anybody can tune it. You need to go to a REPUTABLE gas place. Most just do an autocalibrate and adjust the idle mixture by feel. You need to look at reviews to make sure you're seeing a proper lpg specialist. What brand is the system?

    The injectors have a finite life unfortunately. Some can be rebuilt, some cannot.
     
  5. LX8Adventura

    LX8Adventura New Member

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    Its a BRC system. It was already fitted when I purchased the car 5yrs ago.
     
  6. sleepa

    sleepa Shiny...

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    Since you have replaced a lot of components I would suggest getting an expert to look over it and adjust the tune.
    Might be the easiest at this point. And they should be able to diagnose it fairly quickly.

    Not sure who is around your area, but I had a sprint LPG system installed and tuned, then through a local Repco service centre (they were the only local LPG place). But they did a great job so might be worth seeing if they have one in your area if you can't find an independent LPG specialist.
     
  7. blackve76

    blackve76 Well-Known Member

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    Get a spray bottle and check all hoses with soapy water for leaks, found a few on our v6 cut the rubber reseated clamped and all good again, model was a bit average. Can't see why it should need a retune if injected. Changed the log filter and clean the throttle body.
     
  8. sleepa

    sleepa Shiny...

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    Great point. I can't believe I forgot that.
    I'd assume it might need a retune if the converter had been replaced.
    My system was fine once it was first installed, but after a month or so it needed a retune to smooth it out. Don't ask me why. We also managed to score a couple extra kws.
     
  9. EYY

    EYY Well-Known Member

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    Believe its generally because the injectors take a little while to 'bed in', but as for making more power that's just a tune/afr thing i'd say.
     
  10. sleepa

    sleepa Shiny...

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    That sounds about right. I guess they just did a bit more fine tuning the second time round.
     
  11. LX8Adventura

    LX8Adventura New Member

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    Thank you for the advice. I'll keep you posted when I find out the issue.
     

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