sevfd404

I have an 07 chevy 1500 classic with a little over 82,000 miles on it, in the last few days the engine has developed a "knock" in it, but the knock is only noticable between 1,500 and 3,000 rpms. Anyone have an idea of what this could be? thanks for the help

2007chevy5.3l

iTrader: (21)

Is it from the bottom of the engine or top? Oil pressure look normal?

sevfd404

Hard for me to tell top or bottom, i can hear it in the front drivers side cylinder. oil pressure is normal, can hear it going down the road as well, but cant hear it below about 1,500 rpms driving or sitting still

2007chevy5.3l

iTrader: (21)

How does the engine seem other than the knocking? Down on power any?

sevfd404

no loss of power, runs the same

skinny chicken

iTrader: (1)

I've seen cats make a knocking noise. In fact I bought a new 5.3 because I thought it was the engine knocking. Turned out to be the cat knocking.
Just a thought

jerryls7

iTrader: (1)

mine did the same, it was the gas i was pumping.

sevfd404

Anyway to check the cat and ive bought gas at about 3 or 4 different places since this started. Anything to do to clear it out if it is gas induced?

Robert91RS

iTrader: (2)

Pop the valve cover off and rule out a spring or pushrod issue.