@daniel_clayton_: I accidentally made the video on a 15 second timer. That sound is cylinder compression of getting past an improperly installed injector, the copper washer failed. Reinstalled injector with new O-ring and copper washer, and NEW GM hold down bolt. No more problems. #duramax #DIY #carsoftiktok #trucks #chevrolet #gmt800 #ford #work #bluecollar #DIY #dieselmechanic #cool #LearnOnTikTok #crazy #safe #usa #diesel #ford