03 Ram 5.9 HO knocking noise
I recently bought this 03 Quad cab dually with a 5.9 HO engine. It had 206,000kms on it & I know nothing about it's past. When I first went to look at it according to the owner it had sat a few months. I had to boost it to start it. It then started right up but I noticed a knocking sound on top of the engine. I previously had a a 96 12 valve so I was unsure how the common rail was to sound. I took it for a drive & everything appeared fine. I bought it & drove it home 500kms. Truck ran fine. Changed the oil when I got it home & can say the knocking isn't always there. It is heard at idle & not too sure if it goes up with rpms. It's been 2 months now & it still knocks. What I am concerned with now is the noise. A guy came by this weekend & bought a tonneau cover off me. He showed up in the same truck, same year. No knock. His had 266,000kms & nothing down to his. I don't know if this is valve related or an injector knock. This week I could feel a slight vibration, like a miss in the pedal that wasn't there before. The tach seems steady & no obvious signs of anything. Mileage is roughly 20 Canadian miles per gallon checked with the odometer not the lie-o-meter. Any ideas?