4.2l engine won't go past 3500rpm
01-09-2015, 10:25 AM
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4.2l engine won't go past 3500rpm
I have a 2008 f-150 that has power issues. Accelerating up an incline or pulling a trailer, the truck gets to 3500 rpm and won't up shift. It also has a labor knock in the engine and the misfire count goes crazy. I replaced plugs, wires and coil pack and hasn't changed the problem. I am also loosing coolant. Pressure tested and have no external leaks. Any suggestions?
