Early 04 slight knock/ticking when I left off the throttle. - Dodge Cummins Diesel Forum
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post #1 of 14 (permalink) Old 11-17-2019, 01:45 PM Thread Starter
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Early 04 slight knock/ticking when I left off the throttle.

I have an early 04 5.9 and when I let off the throttle (sometimes) there's a slight knock/tick. Only last about 1 or 2 seconds, it's very suddle and I only noticed after I turned my radio off (I did finish going up a hill when I noticed this too and after about 3 more minutes of driving it didn't do it anymore). It isn't loud either and it sounds like a very, very light knock-ish. No white smoke on start up and it starts very quickly. I just did an oil change yesterday and I use rotella T6 5w40 (I live in Ontario canada so it's cold at the moment), I do put diesel kleen in my tank every fill up and the truck is basically stock, besides small tranny upgrades. Truck does have 211k miles (340k kilometers). Anyone know what it is?

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post #2 of 14 (permalink) Old 11-17-2019, 02:11 PM
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Check the injector feed tube hold down clamps, them being loose may cause a tick. Also trying to pinpoint the location of the tick helps.
Thought you had meant sudden, reading again you mean subtle ( delicate or precise as to be difficult to analyze or describe ).
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post #3 of 14 (permalink) Old 11-17-2019, 02:55 PM Thread Starter
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My bad, I didn't double check what I was typing. I will check out those clamps and see if I can recreate the issue.
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Check the injector feed tube hold down clamps, them being loose may cause a tick. Also trying to pinpoint the location of the tick helps.
Thought you had meant sudden, reading again you mean subtle ( delicate or precise as to be difficult to analyze or describe ).
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post #4 of 14 (permalink) Old 11-17-2019, 03:23 PM
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If the line snubbers tightening doesn't solve the noise, try going through the whole injector and connector tube retorque sequence. A loose injector or connector tube can cause diesel leakage and an imbalance noise.

Last try, add 1 oz of TC-W3 outboard lube per gal of diesel. Especially helps with the dry low lube #1 winter thin diesel
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post #5 of 14 (permalink) Old 11-17-2019, 03:58 PM Thread Starter
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I'm a little concerned doing that, this truck wasn't well taken care of (rust wise) so stuffs pretty rusty. I do plan on doing all new lines around summer.
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If the line snubbers tightening doesn't solve the noise, try going through the whole injector and connector tube retorque sequence. A loose injector or connector tube can cause diesel leakage and an imbalance noise.

Last try, add 1 oz of TC-W3 outboard lube per gal of diesel. Especially helps with the dry low lube #1 winter thin diesel
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post #6 of 14 (permalink) Old 11-19-2019, 09:06 PM Thread Starter
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Sadly none of that stuff helped, but I do have more info that might help. Noise doesn't happen unless the truck has load, I can't recreate the noise in park/neutral. I can however recreate the noise while driving, modest acceleration, then let off the throttle and the noise is back. Sounds more like a hydraulic lifter not pumping up for a few ticks and since these trucks don't use hydraulic lifters, it has to be something else.
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post #7 of 14 (permalink) Old 11-19-2019, 11:56 PM
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Have you done the valve adjust? Should have been done same time at injector loosen and torque sequence.

Check the push rods and valve rocker mechanisms for any excessive wear or crush damage to ends, bent push rods. All valve ends approx same height? All rockers move freely. Oil getting to all the rockers and valves?
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post #8 of 14 (permalink) Old 11-20-2019, 10:46 PM Thread Starter
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I have not, I'll adjust them Friday, as tomorrow I'm with the gf and she'll complain.
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Have you done the valve adjust? Should have been done same time at injector loosen and torque sequence.

Check the push rods and valve rocker mechanisms for any excessive wear or crush damage to ends, bent push rods. All valve ends approx same height? All rockers move freely. Oil getting to all the rockers and valves?
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post #9 of 14 (permalink) Old 11-21-2019, 09:13 AM
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It would be nice to know the rail pressure when you let off also .

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post #10 of 14 (permalink) Old 11-21-2019, 03:33 PM Thread Starter
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I agree, I do have things planned, but so far I've just been fixing the truck and slowly replacing . I definitely need a set of gauges. I'll y'all updated.
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It would be nice to know the rail pressure when you let off also .
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post #11 of 14 (permalink) Old 11-21-2019, 06:27 PM
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With original injectors probably one is wearing and out of balance. That is typically where you hear them is when motoring. Try the door wiggle test, open the drivers door all the way and run rpms up to 1000-1200 and watch the door. If it is bouncing and\or wiggling you have unbalanced injectors.

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post #12 of 14 (permalink) Old 11-22-2019, 04:06 PM Thread Starter
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Checked valve lash, all checked out good. Didn't have to adjust any of them. Also did the door test and bumped rpms to 1200 for a few seconds and nothing, not even a wiggle. This noise is driving me nuts, I'm hoping it's something stupid. It's been freezing and below the last couple of days and I've had no issues starting the truck (with or without blocked plugged in), no hazing on start up or after warm up. Once in a blue moon it'll take 3-4 seconds to start vs the 1-2 it usually does start in, but that's only if I've taken a short trip (which I don't like doing, I even go out of my way to take the longer ways to my destination to make sure it gets to operating temp) and it isn't at operating temp yet, but again even then it doesn't always do it.
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With original injectors probably one is wearing and out of balance. That is typically where you hear them is when motoring. Try the door wiggle test, open the drivers door all the way and run rpms up to 1000-1200 and watch the door. If it is bouncing and\or wiggling you have unbalanced injectors.
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