Quick Rattle noise on cold startup 2016 5.3. NORMAL?

[Goldy]

I have a 2016 Silverado LT Club Cab.I think the truck is great, 5.3 has plenty of power and the truck rides smooth. On cold start I get an almost diesel  souding brrrrp. Kind of annoying,anyone experiencing this phenom ?

[vinemann12]

Probably the High Pressure fuel pump / DI system when engine is "Cold"

Not too noticable when engine is warm or operatiing temp..

When 5.3 is running in Park,, you will hear "tick" of DI pump..

Was one of the many new sounds I discovered with my 2016 RCSB / 5.3..

 

Cheers----K