Might be low octane gas. Try a tank of Premium and see if it helps.
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.
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.
A hole in the muffler would cause a knocking sound in your muffler. A loose exhaust pipe can also cause a knocking noise.
Power Steering?
Typically, a knocking noise when to use your brakes in the car is caused by your brakes wearing down. This means you need to get them checked out and repaired.
A single knocking noise when braking or turning can be caused by a faulty axle. The cost of replacement is usually around 1,000 dollars.
can you elaborate? engine noise? stationary/moving? ticking, tapping or a definite knocking?
you may have a rod knocking and you need to take it to a shop asap
Running too lean.
your cv boot has torn and needs replacement
Normally caused by worn steering or suspension components.
A knocking/clicking noise when making a turn is a sign of a torn CV boot. In this case it's the driver side boot that is torn.