Engine Knocking Noise problems of the 2000 Chevrolet Silverado

We purchased a 2000 Silverado 2500. There is a knocking noise in the engine. We took it back to the dealership to look at and nothing could be done about it. Gm is well aware of the knocking noise in the vortex 6. 0 engine. They told us that this was a common problem. It does not matter if it is a cold start or if it runs all day.

I own a 2000 5. 3 vortex v8 in my Chevrolet and the engine makes horrible noise when its cold, referred to as slapping of the piston sleeve. What can be done about this if anything. Seems like an on going problem for many gm owners and something that is only resolved once a big stink is made of it before any possible action is done. I really love my truck but, this in conjuntion with the noise I get in cold weather going over speed bumps or unleveled surfaces in the shock or the frame. I had all kinds of parts replaced and it still comes back in cold weather, along with the knocking noise on cold starts. Any advise out there for a resolution? thanks nhall.

: updated 10/25/2006 - everytime the vehicle was started and the engine was cold, it made a knocking noise, which continued until the engine warmed up. There were no warning signs prior to the incident. The vehicle was taken tot he service dealer who said the noise was carbon build-up on the piston. The dealer tried running cleaner into the engine twice but the noise was still there. The dealer said it was piston slap making the noise and that it was ok to drive.

Consumer states there is knocking noise in the engine while driving the vehicle. Dealer and manufacturer offered a 100. 000 miles extended guaranty. Consumer declined. Please provided further information. Ts.

Engine was making a knocking sound while idling. The consumer was told by the dealer that gm was aware of the problem, however there was no fix. The dealer also stated the problem was due to a piston slap.

There is a knocking noise in engine when consumer is driving. It will happen only when vehicle is being driven. Contacted dealer, and dealer is not willing to do anything.

Car has been in service twice for knocking noise heard in engine.

There was a knocking noise coming from engine. Problem only happens when starting vehicle in morning. Contacted dealer.

Engine knocking noise. Took to dealership twice, and they DE-carbonized the engine (which is a hoot!).

Vehicle is experiencing problems with engine making a knocking noise and the brake system malfunctioning.

Upon starting vehicle there is a knocking noise in the front end that stops after 3 minutes. Took vehicle to dealer, and dealer stated it was normal. Also, parking brake problem. The vehicle had a knocking noise coming from the engine as well as a problem with the parking brake.