this is another engine knock problem.

there is an engine knock during idle and it sounds faster if i rev up the motor..

i remove the tension wires so that when i crank the engine if wont start but still i can hear a knock every cycle..

but when i remove the sparkplug in the 4th cylinder and crank the engine there is no more knocking..

whats the problem with my engine...????

 

#4 Connecting rod bearing is damaged, or #4 bore is scuffed.