Ford 4.2L industrial LP Backfiring S&S Tug?
Two trucks, both fueled by LPG. Backfiring when accelerating heavly. Manual says either burning rich or Ignition issue. New plugs and wires. No vacume leaks. computer controlled, no way to adjust fuel air mixture or adj timing. Had factory service tech hook up laptop, stumped him allso…Just a shot in the dark, any one ever run accross this problem. Will be highly impressed If I acually get an intelgant answer.
One Response
talon699
31 Jul 2010
Hopefully you put in the proper plugs and heat range for an lpg engine. Also is the timing set for an lpg motor? The plugs are 1-2 heat ranges colder than gas, and the timing should be 2-5 degrees below stock for a gas motor. Is this a dual fuel or straight lpg? Is the ignition module still good? I know the ecu controls the timing but it has to be able to be checked and set somewhat to compensate for operating variables. did you replace the air filter? ( running rich)