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Humvee Engine Knocking (yes it's actual knocking, probably)
Sounds a lot like this knock video. Injector knock -
Humvee Engine Knocking (yes it's actual knocking, probably)
Just listened to the 2nd video and I believe it's a stuck open injector. Explains the sound and the smoke. As suggested crack the injector lines one at a time to isolate. If it is stuck open don't drive it as the poor cylinder is getting washed. -
Humvee Engine Knocking (yes it's actual knocking, probably)
When you get on it what color is the smoke and how much of it is there. Could be an injector failing. Get a stethoscope to help isolate the noise. Mark Audio stethoscope -
Humvee Engine Knocking (yes it's actual knocking, probably)
An very old engine cleaner was to add a qt of kerosene to the oil with the engine cold then bring it up to temp and let it sit and repeat. Change the oil and filter. The kerosene will cut though and dislodge the sludge buildup and hopefully clear up any issues. It does help. Mark -
Humvee Engine Knocking (yes it's actual knocking, probably)
Make one of those quarts of oil a quart of Marvel mystery oil as it can help get things unstuck. Mark -
Humvee Engine Knocking (yes it's actual knocking, probably)
Pick up an inexpensive Stethoscope to help localize the knocking. A bad injector could be the culprit. I had picked up two nos injectors for 40 bucks shipped from flyaway just in case I may need them in the future. mark