GoldmistXL
New Member
- Joined
- Jan 21, 2008
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2007 Denali with 6.2 liter engine and no cylinder deactivation. 248,000 miles, original owner, well maintained. Has been running perfectly. Just started ticking with light rattle only under light throttle. No rattle at idle, none at higher RPM. Noticed on highway at 1500 rpm in 6th gear under very light acceleration. If manually drop a gear or two, the sound goes away. Any ideas. Valves?
