engine knock

[cummins600isbe]

I have a knock that will not go away, ive tried everything i could think of. it is not timing rattle as i know what that sounds like. I have sent my injectors back to don and nothing was with them. i have taken all of my boxes and downloaders off and it still knocks. i have adjusted my valves and it still knocks. when idling there is no knock, it only knocks when im driving. i have tried a different relief valve and no luck, and also a new FCA and no luck. Its nothing with head gasket bc i sent an oil analysis in. where do i go next? thanks guys

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2008 F-350 6.4L King Ranch 4X4,SPARTAN TUNED.
2004.5 Cummins, 2500, 4X4, Full billet, FASS, TST, SMARTY, Flux sticks, cam, Di-Procol (Boost, Boost, EGT, Trans, Rail, Fuel, EOT, ECT), AFE, 5" pipe, and more (893 on fuel )

[rich2500]

I had the same knock sounded like an injector,changed out my cp3 due to a rail press. problem and now the knock is gone

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2004 305/555 6sp.DIY cruise control, 373's, bd short shift,homemade boost elbow,autometer boost and egt, isspro fuel press.,zenon flares,quad race box or sp diesel stage 1 stacked with diablosport predator, modded tone ring,bd pusher pump(and yes the truck still runs if the oem pump dies)afe intake and tt,sp diesel overboost eliminator,DIY modded cp3,

[mthisguy]

I have heard exhaust leaks that sound like knocks, they usually get louder under power and seldom audible when idling.

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06 48RE megacab, not cummings equipped but Cummins powered. Edge Juice/Attitude, mod'd intank fuel pump, Fleetguard FS20000 fuel filter and external lift pump regulator, modified intake housing, Goerend tranny/billet input, GDP intake horn.

[cummins600isbe]

i dont think its exhaust, i looked all over the exhaust manifold and saw no soot or signs of leaks, and all bolts were tight

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2008 F-350 6.4L King Ranch 4X4,SPARTAN TUNED.
2004.5 Cummins, 2500, 4X4, Full billet, FASS, TST, SMARTY, Flux sticks, cam, Di-Procol (Boost, Boost, EGT, Trans, Rail, Fuel, EOT, ECT), AFE, 5" pipe, and more (893 on fuel )

[aceracer24]

Is this knock something that happens when you're in park and reving? Or is it only when you are driving? Does the knock stop at idle when your moving, as in coasting down the road in neutral at a decent speed?

When you rev, the motor will torque to once side, something might be touching, possibly a broken motor mount? Bumps could be making something that is loose tap against something.

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'04 3500 Laramie SB QC 4x4 305/555 CTD, 48RE, AFE Stage 2 CAI, 4" Aero 4040 Turbine, Banks Six-Gun w/PowerPDA, Tone Ring Mod, 35/12.50/17 MT Baja Claw Radials, 2" Leveling Kit

[Roid]

Does the knock have a certain rythem? Does the rythem increase or decrease in respect with engine RPM?

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03 2500 SLT, HTS Billet Trans, Airdog 150, II CP3, +75HP Injectors, K&N CAI, 4" 409SS EXHT, Bully Dog TD, Flex-a-lite fans, 20x10 WCC dubs, 35s Nitto Trail Grapplers, Road Armor, 2' leveled.

[cummins600isbe]

in park and reveing i cant hear it, it goes along with rpm but not exactly, but my rail pressure also goes along with the rpm. so im thinking cp3 but still not sure.

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2008 F-350 6.4L King Ranch 4X4,SPARTAN TUNED.
2004.5 Cummins, 2500, 4X4, Full billet, FASS, TST, SMARTY, Flux sticks, cam, Di-Procol (Boost, Boost, EGT, Trans, Rail, Fuel, EOT, ECT), AFE, 5" pipe, and more (893 on fuel )

[aceracer24]

Sounds like it requires a load and I am not familiar with what a CP3 knocking would sound like but I would guess it has something to do with it. Turbo's won't build up much pressure without a load either so you might want to focus in those area's. Check your drive train as well I guess. Parts of the truck will act differantly when you apply a load to it so check out everything you can think of that might change during a load. Try hooking a heavy trailer to it and pulling up hill slowly to check for the knock. Maybe even try some power breaking without letting the tires loose and see if you can hear the knock.

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'04 3500 Laramie SB QC 4x4 305/555 CTD, 48RE, AFE Stage 2 CAI, 4" Aero 4040 Turbine, Banks Six-Gun w/PowerPDA, Tone Ring Mod, 35/12.50/17 MT Baja Claw Radials, 2" Leveling Kit

[xploretx]

Judd,

Sorry I can't help with this one, but I use to live in Marble Falls. If I remember the dealer in Burner is not any good. I bet your in Co in the summer.

Pete

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2004 Laramie, 4x4, QC, 48RE, 3.73 LS, SRS, Molten Red, BFG 285s, xfer and fuel tank skid plates, Frontier back bumper, Cool Blue, Moog greasables, Defiant sector plate, FASS2, Yaesu 2M and CB radios, Nav 1, Rokk sens.

[cummins600isbe]

got a buddy with a stock truck and we are goign to swap cp3's for a day and see what happens hopefully it wont knock.

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2008 F-350 6.4L King Ranch 4X4,SPARTAN TUNED.
2004.5 Cummins, 2500, 4X4, Full billet, FASS, TST, SMARTY, Flux sticks, cam, Di-Procol (Boost, Boost, EGT, Trans, Rail, Fuel, EOT, ECT), AFE, 5" pipe, and more (893 on fuel )

[RDyson]

Just had a buddy with an 04 develop a tick. It turned out to be one of the injector line supports was not tight. They tightened it up and solved his problem.
Saw that you have pulled your injectors. Do you have to remove those clamps to do that?

Just another thought.

Randy

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03 SO/Auto, QC/4X4, TST/Smarty, Boost/Fuel/Pyro/Rail Pressure, SPS-62, Goerend, Amsoil 4510, Airdog, Arson Kit, GDP Power-Flo, Grid Eliminator, Fuel Tank Vent Mod, Donaldson 51", Flux 1's, ARP, 613/1171, 13.16@108.2

[cummins600isbe]

ya, everything is tight nothing is loose. ive tried everything possible for loose bolts.

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2008 F-350 6.4L King Ranch 4X4,SPARTAN TUNED.
2004.5 Cummins, 2500, 4X4, Full billet, FASS, TST, SMARTY, Flux sticks, cam, Di-Procol (Boost, Boost, EGT, Trans, Rail, Fuel, EOT, ECT), AFE, 5" pipe, and more (893 on fuel )