On lpg vehicle backfires and blows intake pipe to pieces
1993 landrover discovery 3500cc efi catalyst auto twin 40 lt tanks underslung!
been fine for six months last 2 days started to misfire and and blew the intake pipe off between air flow meter and plenum chamber, refited and fine then back fired again destroying intake pipe!! repaired vehicle fine on petrol and ok on gas till back fire!!!
Re: on lpg vehicle backfires and blows intake pipe to...
I had a similar Prob on a commodore. Gas fitters were clueless, but a parts retailer said nine times out of ten it's the spark plugs or leads deteriorating. I changed to top gun leads because the plugs were fresh. now no more problems!
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temp sensor failed. could be the air intake sensor... or the ecu temp sensor falling... easy to find out if intake sensor failing. before starting on a cold morning. or under 10 degrees.. unhook the air pipe and blow with your breath over the sensor put back and start engine. if engine starts fine then that's your problem.
Depending if it is backfiring out carb or out exhaust will tell you if the time is off. The carb backfire is a sure sign the timing is off. A valve is not completely sealed off before ignition and it explodes before sealing off the chamber. This also could mean a burnt valve as well. AN exhaust pipe backfire could be a few things. Raw fuel in muffler that ignites from the heat. Over rich mixture, timing, jump timing belt, clogged catalyst, etc. Now your vehicle runs on LPG which actually is a good thing. Much cheaper then gasoline fuel. I am not familiar with LPG carburation methods, but backfires are pretty basic. Carb or exhaust fire, timing is a good direction and carb adjustment. I would do a compression test also. Check for a leak that is not allowing a full burn of the fuel in the chamber. Check vacuum lines also. If Timing the vehicle requires a short between 2 points, it must be done to show correctly the proper setting without advancing the timing. As long as the distributor has not been removed and placed a tooth off which is rare, but jumped timing belts will set a tooth off occasionally. Do a compression test, it will let you know your engines condition accurately.
Have you had your system completely checked, made sure that all relevant gas pressure is within normal range, and that the engine has correctly been timed and adjusted in order to compensate for the new fuel?
Have all of the plumbing, the guages and the fuel management and delivery system double checked too. I will need to know if the engine is cutting out on idle, or when you are switching the engine over to use LPG. Will also need to know what conventional fuel this vehicle was using.
I hope to hear from you in the near future, but I hope my simple checks do work things out for you.
does it have fuel pressure? to find this out get a can of spray starter fluid from a auto parts store, spray it into the engine air intake, if the engine starts you most likely need to replace the fuel pump which is located in the fuel tank.
What's a disco? Wow! I'm not a certified mechanic, but try disconnecting the air intake hose and having a helper start you car. Soon as it starts spray a dash of AUTO starters fluid (CARB CLEANER) into the intake manifold. Moisture may have accumilated in fuel line. Sometimes when an altinator is going it might act similarlry, but try the low to no cost options first. See if all of your lines are connected tightly. Check the fuses. a blown fuel pump fuse would give your results. Look at the fuel filler hole for moisture as a slight check for tank moisture.