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2003 6.0 liter knocking

HELP! 2003 SILVERADO 2500HD 6.0L KNOCKING

2003 6.0 liter knocking

Postby Wolfy [OP] » Jan 08 2013, 4:10am

PLEASE HELP! I just purchased a used 2003 Silverado 2500HD 6.0L with 131000 miles. It has a knock in the engine when I first start it up. It doesn't do it every time I start it up, maybe 50% of the time then goes away as long as I'm putting around town doing 30 or 45 MPH. BUT, it doesn't stop there. The knock returns when I reach about 2500 RPM'S and it gets very loud, fast and constant especially if I'm doing about 70 on the interstate with the cruise control on. It does seem like the oil pressure drops a little when it is making the noise as well. It does it consistently whether it is hot or cold. I have been to 2 different mechanics and both have told me 2 different things. The first one told me he thought it was a timing chain and the second said he thought it was either a rod or a lifter noise. They both used a stethoscope, but the second one actually pulled all the belts and the fan to rule out the front of the engine. He's the one who said he thought it was rods or lifters. If ther is anyone who can help or give me some insight into what is actually going on, I would greatly appreciate it!
Thanks!
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Related Topics  5.7 liter   2000 GMC Sierra 2500 with 5.7 liter vortec   1992 1500 suburban 5.7 4x4 knocking under load   2003 GMC Sierra 1500   2003 chevy 1500 needs more power   random misfire........2003 gmc 1500hd   2004 gmc 2500hd 8.1L vs. 2003 gmc 2500hd 6.0L 
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Re: 2003 6.0 liter knocking

Postby ASTE25 » Jan 08 2013, 6:33pm

Could be piston slap, it's pretty common I believe.
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Re: 2003 6.0 liter knocking

Postby badassGMC » Jan 08 2013, 6:35pm

replace knock sensor should fix problem
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Re: 2003 6.0 liter knocking

Postby ASTE25 » Jan 08 2013, 6:43pm

I don't see how a knock sensor will cause a knocking noise.........
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2013 Blue Granite Metalic Silverado 2500HD Z71 4X4 extended cab regular bed
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Re: 2003 6.0 liter knocking

Postby sabre 67 » Jan 08 2013, 6:49pm

I had a similar problem on a engine,turned out to be one of the piston rod cap bolts had loosened off
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Re: 2003 6.0 liter knocking

Postby ASTE25 » Jan 08 2013, 7:12pm

^^That could get real ugly, real fast.
Jordan
2013 Blue Granite Metalic Silverado 2500HD Z71 4X4 extended cab regular bed
6.6L Duramax/Allison 6 speed
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