Originally Posted by
Jack of all trades
Hi I'm pretty new to the tuning world. I've got a 2017 Gmc Sierra 1500 with the l83 Bone stock and it is having nearly identical issues. It has a distinct tick that at first I chalked up to a slight exhaust leak but I've checked the exhaust and there does'nt seem to be any leak and the noise is getting more pronounced. It sounds sharp and metallic so I'm beginning to think something in the Valvetrain. Any ideas on what could be causing it? Also wandering if that valvetrain noise could be affecting my knock sensor and retarding the timing?