The backfiring happens when quickly accelerating or getting out of the throttle and this blows the air cleaner cover off. It only backfires like this a couple of times a day if at all. The lift only has 1700 hours on it and it's the only one of it's kind in our fleet. The factory first stated that it was an ignition problem but after I changed all that now they say it's our propane but I'm not having any issues with any of the other LP lifts. I was talking to a friend who is still doing field service and he said he's having the same problem with a vortec powered Daewoo. Coincidence?
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