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International Automotive Technicians Network
Re: steady missfire at idle and underload
Posted to Technical Discussion Forum on 1/30/2009

I can't find the captures but I was tracking down a misfire on a '99 E-250 5.4l a few years back. It would miss hard when accelerating above 60mph or so. Never set a code, the scope patterns looked good (all I can find are the coil ramps now). The primary volt... Login to read more.