Check the U joints on the front driveshaft. Also see if the front differential is in good shape, with no play in the pinion gear input. Beyond that, if you have locking hubs, make sure they're either in or out all the way and the same on both sides.
My 2000 Grand Prix would have a low-speed knocking noise coming from the drivers side as the CV axle was failing. The loss of lubrication in the CV Boots allows the joint to make a knocking/tapping sound at a low speed. If the knocking is coming from the engine compartment, then it could be an entirely different problem.
Have vehicle scanned to determine the problem
NO. A knocking noise in the engine is a problem in the engine.
Having a bad rod bearing could cause a truck to make a loud knocking noise and shake when driving at high speeds. The engine having a coolant leak or an engine timing problem could also cause the knocking noise.
it sounds like you have a major problem if the engine knocking is coming from the oil pan that could be a rod knocking. that means having to pull engine and spend a lot of money. good luck you may need it.
check heater blower motor blower wheel could be broken off The knocking comes from an Acctuator that has stripped out in the Hvac case. You Have to replace the acctuator to solve the problem.
A knocking noise in the front wheels can be a very serious problem. The knocking noise could be caused by bad ball joints. Bad ball joints can slip off the tie rods and cause the wheel assembly to collapse. This problem should be looked at as soon as possible.
Bad bearing? Bad connecting rod?
There could be a problem with low old causes the pistons to rattle. There could also be a problem with the rocker arm.
rear shock absorbers are a common fault
The engines timing could be advanced to much. If it's a front wheel drive a CV joint could be going bad. Knowing a more precise area of where the sound is coming from might help to identify the problem.
I found my noise wasn't something loose. It was the rear strut was bad. Was more of a load squeak that sounded like something knocking.