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IH 407 engine misfiring
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waynemh
Posted 5/24/2016 12:44 (#5317964)
Subject: IH 407 engine misfiring


just got done with a complete engine overhaul in a IH 856 non turbo , new liners,pistons,reground crank, valve job, new valve lifters, I can not get it to run smooth, runs fine at idle, but as soon as I increase to 1330 rpms +or- 10 it will start to misfire on #4 and #6, when I increase the rpms to 1400 it will than misfire on #3 and #6, ad than above 1450rpms it will somewhat smooth out until around 1700 rpms it will repeat the same scenario, I have replaced the injection pump,injectors and played with timing but that did not make a diffierance, the misfire is not a complete miss but enough to make it run rough, could there be to much backlash in the cam & timing gears? any help would be appreciated, Thanks, Wayne
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