Andrew7

Hi @BigBadSierra, @reeseb, @Black02Silverado, thank you so much for feedback. Correct me if I am wrong - If this was one noisy injector, then I should hear it louder from the top of the engine, not from the bottom. But in my case I cannot hear any noise coming from the top of the engine and majority of the noise is under the engine. What you think? THanks

Hi all, My new Tahoe 6.2 engine ticking, less than 2k km mileage. Those who had experience with lifters, HPFP, etc, please help me to diagnose it. I would like to understand if that is something I should be worried about or it is normal engine operation sound. Here are some additional details for you to diagnose better: 1. There is no tick on cold start and within next 7-10 mins after start. 2. I can hear the ticking noise only on warm engine (mainly after 20 min drive). After ticking noise started on warm engine it doesn't go away unless you park the car for 5-6 hours. 3. I can hear it mainly from the front left wheel area and even more clear I can hear it from the bottom of the engine (under the driver's door) 4. The ticking noise doesn't sound like a loud knocking (like in the videos when lifter failed). It sounds much lighter than that, but at the same time it sounds much louder than injector noise. 5. The ticking noise appears mainly when idling. When you slightly press and hold the gas it disappears. But when you rev it further, it is still there but the volume of ticking noise is getting lower and it gets completely not recognisable at RPM>2000. The potential scenarios in my mind: 1. Lifter issue (the worst) 2. High Pressure Fuel Pump issue 3. Normal lifter operation sound? 4. Normal HPFP operation sound? 4. Anything else? Here is the recording of the ticking sound on hot engine (after 40 min drive). Here is the recording of the cold engine sound (I can't hear any ticking noise) Please share you thought, appreciate your support.