Loud Tick/Knock during cold start on 4.8

Yea it's very common, it's called lifter tick. It's just the lifters trying to get the oil up in the engine you can try changing oils to a ...

If it's just a small tick and doesn't sound like a deep and hard tick or knock then I wouldn't worry about it. There's alot of the earlier ...

Running SeaFoam through the oil 50-110 miles before and oil change cleans out the oil and really helps to stop the tick/knock. My 96 had this ...

if the noise goes away after about 30 sec. then it's piston slap, if it continues i would say injectors cycling. the only fix that i'm aware of ...

Sometimes the sound would come back on a cold start, other times I wouldn't hear it. Generally, once a bottom end knock starts, I don't think ...

A lifter will make a loud tapping noise, a higher pitch then a rod knock, but may go away. What can cause this is the oil in the lifter drained ...

My 02 GMC 4.8 has a knock on cold starts, but it stops the knocking sound after it warms up. Still runs fine. What could be causing this and ...

I think it's piston slap. These aluminum blocks can transmit noise in strange ways. Lifters have a distinctive clack to them and piston slap ...

Listen to that dead lifter. Its common to hear your lifters ticking on a early morning cold start with these trucks that goes away after a ...

Sounds like it is coming from one cylinder. Something that loud is usually still there to some degree when the engine is at normal operating ...

Most likely you have some wear on the lifters and they are collapsing as they sit with no oil pressure applied. This leaves clearance in the ...

I started to get a slight ticking from the top of the engine last week which lasted maybe five minutes and after it was warmed up it went away.

The sound is most noisy for the first 10 seconds or so then slightly quieter.If you rev it up slightly 2 or 3 times then let it idle the noise ...

Injector noise. This is one that usually throws people who are new to LS motors. The damn injectors are noisy...always. If you've tested ...

In some cases it is a valve noise, which is more of a tapping, but these usually don't go away after starting. A loose piston can cause noise ...

A distinct clicking or ticking noise emanates from the high pressure fuel pump that can be very noisy during cold starts and quietens following ...

The oil has run out of the lifters during cool-down. When you start the engine up, the oil pressure has to pump the lifters back up again.

They will replace if the customer insists. Mine is loud and lasts for alot longer than the 30 secs they say. Obviously it is only on cold start ...

Could be a lifter. It will be quite at startup when the oil is thicker, but when it warms up and the oil gets thinner it will make noise. My car ...

Here it is... found it. ... Some of the above vehicles may exhibit an engine knock noise that begins in the first 19,000-24,000 km (12,000-15,000 ...