Question about 2000 Chevrolet Silverado
This problem is probably the oddest problem I've ever had with a motor. I'm more then adequate when it comes to trouble shooting internal combustion engines like this; and this one has really got my nerves rattled.
Now, this is a 2500 model that is running the Vortec 6000 364ci/6.0l V8. It always occurs right after initial startup which leads me to believe it would be a valve or pushrod. However; it is NEVER, and I mean NEVER constant.
After about 30 seconds, it totally stops when in park. You can peg the throttle and still not hear it again. Once you start moving however (putting stress against the engine), it occurs only part of the time. Sometimes it will do it for five minutes, sometimes it won't do it again at all.
I've had compression checks done on the engine, and all 8 cylinders are well withing acceptable ranges; so the valves are all seating properly. There is no loss in power at all, and it just becomes annoying. However, at low throttle or no stress it will not make the noise.
Another thing I was looking into was possibly an exhaust manifold leak?
Either way, the problem is intermittent and just annoying. I'm personally led to believe that it is the valves rattling and may need adjusting. I've just done a complete tune-up including a new cone air filter, oil change, plugs/wires and even a new exhaust system and it's still having this noise. So, I don't know what else to check, unless it's going to be a valve problem. This will end up costing over 300 bucks for the valve adjustment (as previously stated by my mechanic).
I appreciate any assistance you guys could give on this. I'm trying to narrow it down to the exact problem. Any insight would be greatly appreciated.
I had the same type of problem on a 2000 2500 4x4 with the 6.0 it turned out to be the last 2 bolts (next to the firewall) on both exhaust manifolds were loose or broken and they generated a cold start ticking sound that went away after it warmed up. Since than I have seen a lot of this problem on many 6.0s with the mystery ticking on cold start.
Posted on Mar 13, 2009
I have a 2000 chevy silverad 2500 with the 6.0l 8. Mine has the same issue. I have searched many sites and asked alot of techs about this issue. The answer accross the board is the valve skirt. Chevy knows of this issue but it does not effect horse power. The best things to do to reduce or get rid of it at a small cost is to run seafoam through the vacum hose and in the oil. remove the vacum hose from the brake booster and dump about 1/3 to 2/3 of can in while running. if it doesnt stall then kill the motor. let it sit for at least an hour and it cleans the top portion of the motor, releasing the built up carbon. when you start it you will see thick black/grey smoke from the burning of all the build up. after that she will run quiter and smoother. the other thing that helped this was to run seafom in my oil right before i changed it. Then when i changed the oil i ran a good brand of full synthetic in it and I almost never hear that tapping noise. I chose to run Mobil ! 5w-30 synthetic and she has almost no noise anymore. it is very rare.
Either that or get used to the noise and tell people it is a diesel since Chevy will not do a recall on this.
**** I accept no responsibility by the claims above, but this did work for m any many others on chevy help sites ****
Posted on Nov 26, 2008
I had the same problem with my 1500 a friend of mine has a brother that works at a chevy dealership. I told him about the problem and he said to get a good oil filter that has a valve that won't let the oil drain back. I'm not sure exactly what they call but they can tell you at the parts store. However I bought the filter it was about $7.00 to $10.00 more but it fixed the problem after about two starts and it has not done it since. I could not believe it was something so simple.. Let me know if that fixes yours....
Posted on Sep 24, 2008
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