Cm871 vibrating and tapping like noise at 1250 and up.

[Husky05]

I just got the truck back from the shop, they gave my engine a clean bill of health, said it's very strong engine and do not see anything wrong with internals. They said they do notice vibration when revving it up but it is very small. Said it could be something fuel related.

They did manometer test to check compression, it averaged out 5inHg. so that is good and within specs.

I am not sure where to start now lol I am thinking of getting one timing and metering actuators just only one of each for one bank and install on front then see if there's a difference, then switch to back and see. Also get a new fuel shut off solenoid. I don't have anyone here with spares to borrow.

Fuel pump is already new, not sure about lift pump.

Then after that and problem is still there, I'll try some sensors.

This is going to be a expensive journey. But going to order new motor mounts as these are original and it's time anyways.