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I've experienced a similar noise when troubleshooting another problem with hissing when I'm cruising. The knocking noise only happened once and haven't heard it again. Was coming from the top of engine under removable 5.7L cover..... weird!
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* 24HR Toy *
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2008 Tundra TRD LTD CM
- 24" Chrome XONI Diva's 305/35/24
- TRD Sway Bar
- Volant CAI
- Magna Flow Exhaust (turn down over axle)
- Snug Top SL Tonneau Cover
- Gladiator Running Boards
- ALE 8000k HID Driving lights
- ALE 8000k HID Fog Lights
- Super Wht Plate LED's
- Super Wht Int. Map LED's
- Super Wht Door LED's
- TRD Shift Knob
- TRD Liquid Sport Pedals
- Rhino Linings Bed Liner
- Rear DVD System
- Bluetooth
- Navi
- Rear Cam
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