Technician A says grounding out a plug wire to a cylinder with a cracked piston will can increase the noise. Technician B says a rod knock will become quieter as its cylinder is grounded. Who is correct?
A)Technician A
B)Technician B
C)Both technicians
D)Neither technician

Question

Quizplus · Accepted Answer

Grounding out a plug wire to a cylinder with a cracked piston can indeed increase the noise, as it changes the combustion dynamics and can make any mechanical issues more audible. Similarly, a rod knock, which is a deep rapping noise that speeds up with engine RPM, can become quieter as its cylinder is grounded because grounding out the spark plug wire effectively disables that cylinder, reducing the forces acting on the rod and thus the noise it produces.

Technician a Says Grounding Out a Plug Wire to a Cylinder