when im at low throttle around neigborhoods and such... when i let off the gas theres a distinct ticking noise coming from the engine. its really quick. the oils fine.... does anyone know what it is?

 

I have a slight tick with mine too while it idles. It's pretty soft and I only notice it half the time when it's idleing even though it's always doing it. It kind of sounds like somebody flipping through a deck of cards yet softer and constant. Don't know what it is though...

 

i got that too. ive always assumed it was my idler pulley or something like that that is wearing out. thought it was a belt issue and changed belts. a week later the sound was back. who knows

 

My girls 04 Sierra does this too, I have yet to figure it out, but it doesn't seem to be hurting anything.

 

mine did it after the cam install... hmmm.

 

they all do it if you listen close enough. mine does it. it got louder when i put on exhaust.

 

All the new truck engines do it. Chevy calls it "normal operation". I haven't seen anywhere that it has caused any problems...

 

I never heard mine do it. Now all I hear is the valvetrain sewin away. lol.

 

What Fuel Grade Do You Run

 

I have to run 93 octane on mine. But it never did it even before tuning and was only running 89. now my g/f runs 89 octane and hers is the one that ticks ever so slightly. Its very light, but drives me crazy, doesn't seem to bother her at all.