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.
If the noise is coming from the rear then the bushing is broken.
Why is gasoline coming out of the ignition switch?
I get knocking & ping noise coming from the fuel injectors
It all depends on the nature of the 'knocking':Cheap gas - light rattle during acceleration indicating 'pre-ignition' is happening.light knocking all around the engine -low / expired engine oilLow oil pressure - plugged filter to failing oil pumpHard knocking - could be a piston coming lose and banging on the side of the cylinder walls - not good(!)Way too many variables to diagnose over the internet.Have the car inspected by a good, reputable mechanic
if it sounds like the knocking is coming from the bottom of the engine i would bet it was the rods or rod bearings may be worn. if the knocking is on the top ,then i would have the lifters and or the rocker arms checked.
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.
A other small child
Most likely your ignition module, grey box on the passenger fender well with 2 plugs coming from it
have you tried higher octane fuel?
Cant you just ask the people at the car place?
If its a legitimate knocking then you would want to go with head gasket if its a tapping you would be looking at a valve
Where is the noise coming from? If its from the fenders or wheels is a much different problem than if its coming from the transaxle.