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!!!
Hi LPG is very dependent apon plugs and lead quality, the first thing to do is replace them both with new, it may very well cure the fault.
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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