Compression Ignition Addict
Join Date: Oct 2011
Location: Chico, California
Thanked 259 Times in 250 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 265k Full Force 160/30, PHP Hydra, S&B CAI, 4" Exhaust, Van Turbo, RR 6/6 Billet Wheel, Autometer Gauges, Transgo Tugger/sonnax shift kits, Non-Ebpv Pedestal, 08 Tow Mirrors, Trucool Max.
Dad-2000 F250 7.3 4x4 114k Autometer Gauges, Superchips 1705 (Tow Safe), Blue 6637, 4" Exhaust, BD Billet Wheel, Trucool Max.