My volkswagen golf 3, 1993 model makes some knocking sound

My volkswagen golf 3, 1993 model makes some knocking sound from the engine compartment when I accelerate?
I changed the engine mountings suspecting it was that still the sound/noise remains, any one have idea what it may be?

If it makes it only on acceleration and no other time and happens once like a thunk then I could understand mounts, did you check the front mount underneath? If its consistant, may be some number of things like transmission, interior engine sound etc. don't overlook the ball joints and tierods aswell as the upperstrut mounts

Is it detonation? Maybe you have carbon increase or another deposits that may be causing it. attempt a tankful of premium gas. If the sound disappears or is reduced, then that is your problem. I am not sure if this model has a knock sensor verify with a VW mechanic. If possibly the knock sensor need replacing.

Having some audio or video may help pin point it. Does the sound change with the RPM's? If you pop the hood and have someone press the gas pedal you may be able to listen and give a more common place of where the sound is coming from that may help too. it'll also rule out suspension/steering related parts if it still makes the sound while sitting still.