Compression Ignition Addict
Join Date: Oct 2011
Location: Chico, California
Thanked 251 Times in 242 Posts
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hpop doesn't make much noise if any. the knock is probably injector knock. at 300k miles your injectors are pretty much toast.
mine have 247k miles and are noisy when cold. and the #8 in injector knocks when cold as well.
could have a fuel restriction as well.
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99.5 f250 7.3 4x4 261k FF 160/30, PHP Hydra, S&B CAI, 4" TBE, Van Turbo with Turbo Blanket, RR Billet Wheel, Autometer Gauges, Transgo Tugger, Non-Ebpv Pedestal, 08 Tow Mirrors, Trucool.
Dad-2000 F250 7.3 4x4 111k Autometer Gauges, Superchips 1705 (Tow Safe), 6637, 4" TBE, BD Billet Wheel, Trucool.