Engine Noise Unclear Of Where?

[donkizle]

gmc 3500 HD 8.1 ltr with a noise that is almost undescribable. put it this way it sounds as if the cam has a sharp point to it and the lifter was comming off that point and slamming back down onto the lobe...BUT it is destingtivly ? louder on the dr side of the motor than the pass with a screw driver to the intake and exhaust manifold and back to your ear. It starts a 2,000 to 2,500 RPM.

[10.90 hot rod]

Man , you are not going to believe this, but am on here tonight searching for answers to the exact same question. I have a 03 2500HD with the 8.1 that exhibits the same damn noise. It has a start up tick which goes away after about 30 seconds. It had that tick for a long time and I never thought anything of it. But, it has this new noise which you described to a "T". It runs awesome and nothing else seams wrong but I am now in fear that I may not be able to trust it. It sounds valvetrainish but not consistant. It is sort of like a someone has a can with marbles in it and is shaking it. It has always had a valvetrain noise on start up, much like thay are bled down and need to pump up. And I don't believe it is piston slap. Anyone else experience this???

 

 

gmc 3500 HD 8.1 ltr with a noise that is almost undescribable. put it this way it sounds as if the cam has a sharp point to it and the lifter was comming off that point and slamming back down onto the lobe...BUT it is destingtivly ? louder on the dr side of the motor than the pass with a screw driver to the intake and exhaust manifold and back to your ear. It starts a 2,000 to 2,500 RPM.

[hockeypro1411]

Did you accidentally buy the Duramax?

 

Sorry. That wasn't helpful.

[Prokopchuk_9]

gmc 3500 HD 8.1 ltr with a noise that is almost undescribable. put it this way it sounds as if the cam has a sharp point to it and the lifter was comming off that point and slamming back down onto the lobe...BUT it is destingtivly ? louder on the dr side of the motor than the pass with a screw driver to the intake and exhaust manifold and back to your ear. It starts a 2,000 to 2,500 RPM.

 

 

try puttin a table spoon of ATF in the valve cover thats ticking...works in a old 350 small block HAHAHA