The cause of a violent startup rattle plaguing a Buick Enclave in a viral TikTok clip didn’t take long for online auto experts to diagnose. Buick Enclave Rattling On Startup: A Timing Chain Problem? The result of that oil loss was the chain and cam phasers clattering when the Buick started again. The noise stopped, he explained, once the engine rebuilt enough oil pressure to operate the tensioners. Current estimates place timing-chain work on a Buick Enclave at roughly $2,500 to $4,000, depending on the SUV’s model year, local labor rates, and how many components require replacement.