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  • lpg back fire

    the car is a 1999 toyota prado 3.4l dual fuel


    i have got the lpg going its a apa tank with a airod converter there is no vac leaks it does idle abit high because of the iac needs cleaning but i have noticed that if you put the boot into it from lights it hesitate for a a second or 2 like its going to back fire through the airbox and it moves along and the previous owner has said it this in the add when i bought it on what happens so im hoping i can get some help on this

    LPG system: likely needs plugs and leads as the LPG system can backfire or stall under load. Had same thing occur about 2 years ago, fixed for few a few hundred had been OK since, but have not attempted to fix this time as will leave for buyer. Not uncommon with LPGs, higher spark plug wear is price you pay for big savings on petrol bill. No issues with petrol side. You can just drive as a petrol car or fix lpg side, which should not be a huge issue. This factor is allowed for in the price.


    Service history: In general have had anything fixed immediately when indicated, no breakdowns. Here are most of the service and repairs performed in in the past 3 tears.

    25.2.2014 Rear brake rotors and pads, replace handbrake shoe, inlet manifold, service and tune.

    17.4.2014 273,838km Replace right rear seat belt

    4.6.2014 277,903km Replace complete hand brake cable assembly

    14.8.2014 Replace exhaust manifold and gasket

    23.09.2014 283,917km Replace radiator, thermostat and coolant

    3.2.2015 291,190km Service / oil change, leads, plugs and calibrate LPG system

    13.4.2015 294,691km 2 inner rack ends, wheel bearings

    17.6.2015 Service / oil change

    30.7.2015 300,315km Replace right front seat belt

    15.8.2015 4x Michelin 265/70/16 Latitude Cross tires. Wheel alignment. I’m not certain of the exact distance, but they have about 12,000km on them and still have a lot of life left, maybe 75%

    21.12.2015 307,302km Service / oil change

    11.4.2016 Wheel alignment and rotation

    22.2.2017 312,431km Front brake pads and rotors

    i have replaced intake hose and coil packs i have checked the spark plugs and they are ACDelco Professional Platinum Spark Plugs and the spark plugs look fine

    i fixed the high idle problem but still when accelerating it surges like its going to back fire

    there is no vac leaks in the system it idles rough when warm on petrol and lpg and just yesturday it back fired and blew my airbox apart so i fixed it and seems to run fine i am really considering of removing the lpg only because next time it might not be lucky the car has got 318,000km on it now i also thought it was the airflow meter so i unplugged it the cel light came on no change in idle i have also cleaned the throttle out and iac out all the vac hoses have been replaced

  • #2
    Hi ltd v8

    Looks like you've done all you can, it might be time to take it to someone who knows what they're doing with lpg systems.
    might be cheaper in the long run, and saves stressing out about it.:wink:

    Tony

    Comment


    • #3
      I hate the fact that LPG systems are getting so good nowadays.. I really really miss listening to taxi's lunching an airbox at the lights... 'Kaphwoomp"

      Comment


      • #4
        Have a read of this thread on exploroz where i had a backfire problem with 80 series.
        https://www.exploroz.com/forum/27303...es-landcruiser
        If you read down to last post you will note mechanics advice to change ignigition leads every 80000 kms and spark plugs every 20000kms.
        Was on my old 80 series but may help with your problem.
        Pedro

        2007 D4D Auto

        Comment


        • #5
          My old 3.0lt V6 forerunner on gas used to do that sometimes, the air hose would blow off the air box.

          Dunno what caused it but I traded it in so dont care.
          2010 150 gxl D4D with ARB delux bar, towbar! Custom DIY drawers, rhino HD bars, 2" Dobinsons, platform rack, IPF lights and BFG AT2 and extras

          Comment


          • #6
            so far new plugs fixed it so fingers cross how ever this is other problem i wouldn't mind solving aswell

            so this is what it does after new plugs fluctuating on idle and in gear and it did it with the old plugs aswell running only on gas petrol is fine how ever i did adjust the throttle cable to bring it up abit so its stable but i still would like to fix it my next fix will be looking at getting a full upper intake gasket kit and do the rocker cover gaskets and doing a full bloody clean on the upper intake
            https://www.youtube.com/watch?v=NRrf1dWOcMs

            Comment

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