Well I waited for about 3years being picky trying to find My truck you all know what I mean.so I finally found the one.it was the right year,ext cab for hunting the color perfect.so I thought I have put about 10,000miles on it an the flicking thing is louder than my buddy's power stroke when I start it an it doesn't matter what the temp is out side.it sounds like sh*t I am vary disappointed I am an a soil dealer an have tried some different things as far as oil an filters an plugs.now I'm havering a hard time with my alignment an tire wear I replaced upper an lower ball joints tie rod ends everything that should have fixed this prob with no results.an as of late iv been trying to use the heater an defrost nothing but cold air I mean come on 10 min warm up time that thing should cook a steak not.I'm not vary happy .i put a lot of time ,energy,money into finding My perfect truck .an with in a few months of having it I just hope I can get it figured out .or cover my losses an buy a real truck with less bullshit an more factory support have some fricking pride in your company an fix this sh*t for their customers. There I said my bitch lol.

seems all gm chevy silverado truck owners are having the same problem the engine knocking. Want to know if anybody has heard from chevy to attend to the situation. Apparently NOT!!. Live in OH. already had to replace the whole damn brake lines ( rotted ) repl with ss lines. Now trouble with the fuel system. have 157,000 miles and I have records from the very start when I bought the truck new. So what do we do? Bitch and complain and yet we still haven't heard from chevy. If you do please let me know. I've complained for years and they only laugh in my face, as they are doing to you. happy trails

The engine started knocking and has progressively gotten worse. I have read some of the other complaints and I believe it is due to the oil pump or something along that line. I say this because as this first began I could start my truck and there would be NO Noise. After about 20 seconds it would sound like the lifters had pumped down and were out of oil. Then about another 10 seconds and they would pump back up. Now they are getting louder and it not only starts as soon as you start the truck, it is louder. I have owned Chevrolet vehicles for probably 35 years and this will be the last. It really pisses me off when a company knows there is a problem and will not fix it. Two other problems that I know many folks have had is the passenger window motor going out and the rear brakes as well. I rarely ever used my passenger window and had to have it replaced. Additionally, I had used my emergency brakes only 3 or 4 times and the back brakes went out. They said it was from lack of use. Come on!

My 2000 K2500 6.0L 5sp manual truck has made knocking noises from day one, only for several minutes when you first start it. It now as 60k miles and makes the same noise. I have always changed oil at 3000 miles with an extended mileage frame filter or better. I use 15w45 mobile one synthetic oil. I just added a half bottle of Hyper-lube for zinc replacement it quieted down a little bit. It has never let me down. It has been a good truck despite the noise.

The problem as discussed before is a skirtless piston design. however the skirtless piston is only part of the problem. Gm uses a one piston Diameter size fits all the bore inside diameters philosophy. this saves on manufacturing costs. A lot of Japanese car manufacturers use a custom fit philosophy. This takes longer to manufacture since every bore diameter is custom fit to every piston. There is very little room for error in the tolerance between the piston and the bore. GM simply cannot control the piston to bore tolerances. So its a hit and miss problem. Not all vortec motors knock. My uncle had 2 6.0L's and they both knocked. But they also ran flawlessly to 140K miles.

To fix the problem requires a complete engine rebuild. Bore the block .010" over and put in pistons with a skirt on them. And use a good machine shop. Someone else here did this and the problem went away. I would stay away from buying a used motor, unless you can hear it run. And also from buying a short block unless the piston diameters an bore diameters can be verified to meet the strict tolerance requirement. Buy an OEM manual to get the tolerance.

Engine made a terrible knocking noise when cold, sounded like a poorly performing diesel engine to be honest. My fix; complete rebuild. I read a ton of forums discussing this problem and most thoughts were piston slap or low oil pressure. When i checked the clearances after 200,000 miles: the cylinder's were not even 0.001" out of spec, piston slap is not the issue. The rebuild got all new pistons, new bearings, bored over cylinders. The low oil pressure? I did have poor oil pressure when I bought the truck, something like 45-50PSi hot and the pressure would get higher as the truck warmed up which to this day baffles me. To correct the oil pressure during the rebuild I put a high volume SLP camaro oil pump in. Now 80PSi cold and 60PSi hot idle. After the rebuild, not a lick of knock. I bought the truck with 167,000miles on it so i thought nothing of the issue, until my 2004 5.3l just started doing it at 145,000 as well... now I am confident its an issue related specifically to the LS based Vortec family of engines.

I developed an engine knock around 25,000 miles. I purchased the truck brand new with 7 miles on it for around $30,000. I am completely disgusted with GM for the run around that they have there dealers try and pass on to there customers. I have listened to every excuse from carbon build up to the way that the engines are made and assembled. I will not purchase another GM truck. I had to learn my lesson the hard and expensive way so by reading this please don't repeat my mistake. So after 11 years and the warranty long since come and gone the trucks engine still knocks and I was unable to get anything done about it. The government should have let GM go out of business since they brought it upon themselves making such poorly engineered autos that no one wants to buy more than once.

I BOUGHT THIS VEHICLE SECOND HAND IN DECEMBER. THE SALES PERSON WAS KIND AND STARTED THE TRUCK FOR ME SO IT WOULD BE WARMED UP WHEN I TOOK THE TEST DRIVE AND WHEN I TOOK IT HOME. ASIDE FROM BEING TAKEN FOR ANOTHER KIND OF RIDE, I LIKE THE TRUCK. THE TRUCK HAS THE SAME PROBLEMS DESCRIBED IN THE OTHER COMPLAINTS. AFTER SPEAKING TO SEVERAL MACHANIC AND TWO AUTOMOTIVE ENGINEERS MOST CONCLUDED THE PROBLEM IS NOT PISTON SLAP BUT LACK OF OIL TO THE LIFTER OR LIFTERS. THEY BELIEVED GMC KNOWS THIS AND PERFERS TO CALL IT PISTON SLAP OF NO CONCERN. THEY BELIEVE THE OIL DRAINS AWAY FROM THE TROTH AND IS NOT AVAILABLE ON START-UP.

DOES ANYONE THINK THIS POSSIBLE AND IF SO WHAT IS THE FIX IF ANY?

I bought this vehicle new in 2000 and after about 30,000 miles, the engine developed a knock or piston slap when engine is cold. After engine warms up about 1-2 minutes, the knock will stop. The vehicle now has about 160,000 miles on it (all highway miles, no load) and the knock is louder and lasts longer each morning when I crank it up. I have tried changing oil viscosity from 10w30 to 5w30 but knock has persisted. Does anyone out there know if a synthetic oil will help this problem?

Rant:

I have owned 5 GM vehicles and this truck has had more problems than all the others combined. The Tow Truck Service driver actually knows the directions to my house by heart. I suggest to GM that if your going to continue to build such 2nd class products, you add a tow bar as a standard feature to your vehicles.

I have also listed on this website, 2 other complaints about this same vehicle related to the transmission and fuel pump.

Called and talked to the head mechanic at the dealership about the knocking noise when the engine is completely cool which when started the knocking sound would last about 10 to 60 seconds then goes away. He suggested to use a full synthetic oil between one regular oil change, should help reduce but not make the noise go away. I took his advice and he was right, however I noticed before I bought the truck that they where using 5w30 oil which is recommended by the truck manual, which I went to a 10w30 which also helped. I still don't think this is right though with so many people having the same problem and I wish there was some way to contact whoever to make this a recall matter and have them fix this problem because I believe this soon will be a costly repair to the engine if not corrected.

I bought this truck in 2004. It had 36000 miles on it so there was no warranty. I drove the vehicle for several months and then it would start making a knocking sound every moring I started it up. It would do it worse when it was cold outside. I took it to the dealership were I bought it from and explained what the truck was doing and the manager said that it was normal that those motors were built loose to keep them from locking up.I have complained about this for several years and now I have 102.000 miles on the truck and the noise is getting worse. I think that this is a manufacture defect and General Motors should fix or replace these motors.If it gets any worse which it will.I will trade it in on a japenese vehicle and never go back to G.M. It is bad that american made vehicles are built so poorly and the overseas vehicles are lasting forever. Remember bad product bad name.