Backfiring issue
I 100% agree with you, i have been installing LPG for many many years now. And the only time i fine it backfiring, is when 1 car is poorly mantain (refer to above) 2 wasn't installed correctly (gas fitters fault) or 3 CHEAP LPG parts (there is alot of cheap and nasty stuff, comming from over seas and beleive me they are **** HOUSE). If you are going to get your car fitted to LPG, i would NOT go for the cheapest price. Ask them what equipment are they using, is it GENUINE (there is alot of copy's out there), what gas tank are they fitting? is your wires soldiers? spilt tube? etc etc I would also ask them to show you a finish product of theirs (you want it to look nice and neat)
i bought a vt v6 on lpg about 2 years ago, and always had the backfiring issue so many people seem to suffer. i went to a (so called expert) local repco licenced lpg installer asking about why this happened. he told me various causes in his opinion, firstly leading him to remove the airflow pipe from my air box.... "oh, this stupid thing always causes commodores to backfire" he said... then leading to me getting the lpg system entirely reconditioned (which was due after the 10 year period anyway), then after that, it still backfired regularly enough, so the repco guys next suggestion, was that my motor was stuffed (which it was, ill agree), so i replaced that with a good second hand job, low and behold...... it STILL backfired just as often.
grrrrr! im thinking to myself now. i hit the internet, and saw a guy on the whirlpool forum, talking about setting the plug gap to 0.8 - 0.9 , instead of the normal gap of 1.5 (pretty big difference really). i thought to myself that this was well worth trying, so set em all up to 0.9. went for a test drive, and my eyes nearly rolled around in my head 720 degrees. NO BACKFIRES. i tried to create all the driving situations before that had made it backfire, and it just wouldnt do it. makes me think of how much of an a$$ the repco lpg installer was, or whether he is really an expert at all.
try this first if you have a BACKFIRING ECOTEC ON LPG . it is the cheapest thing you could try, and, it will probably work.
NO BULL!!!!!!!!