My petrol engine has developed a persistent misfire. How can I figure out which cylinder is the culprit in order to hone in on the root cause?
It is easy to tell a misfiring engine as it will transmit unusual vibrations that vary in severity with engine load. A misfire occurs when a cylinder fails to ignite the air/fuel mixture at the right time and could happen due to a wide range of reasons, including lack of spark (a bad coil), lack of fuel delivery (clogged fuel injectors) and improper ignition timing (out-of-spec cam timing).
There are several ways to identify the cylinder(s) responsible for the misfire: