You may have a loose rod or loose roller rocker
The Hummer H2 is a 2005 SUT with the 6.0L Vortec and a Magna Charger supercharger. It runs great with plenty of power, but I'm concerned about some noise I'm getting out of it. When I first start it up, everything sounds fine. After running a mile or so, I start to get a knocking sound. I only notice the sound when idling, not when running.
It depends on a few variables...#1 - If it's more of a hard clicking sound while the wheel is turned it will most likely be a bad half shaft (drive shaft with 2 CV joints going from transmission to wheel.)#2 - If it is a very hard knocking while driving on a flat, even surface it may actually be loose lug nuts. Tighten them up and check for the noise again.#3 - If it happens when you hit small bumps and a lighter knocking sound, it could be either a bad shock/strut or loose brake pads. If it's a hollow knocking it is a bad shock/strut, if it's more of a rattling knock, it's loose brakepads.#4 - Also check your front end bushings. If the rubber bushings are rotted/gone it can cause a metal on metal knocking sound.
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