swoop
TYF Newbie
I own an 07 Denali . It has the 6.2 litre. I bought with 24,000 miles, with 51,000 now. Since I have owned it it has on occasion had a annoying start issue. What is happening is, either piston slap or I have valves chattering. It is loud enough to hear while driving. I try and keep out of the gas pedal until it warms up enough to go away. Once the temp guage gets above 150 or so it gets quiet. Then once at 220 it will go away completely. I'm not sure what it is or if it is cause for concern. But it is the only vehicle that I have owned that has done it. Anyone want to shed some possible light on it?