Coil-on-plug, or COP, features an individual coil dedicated at each cylinder, with the COP connected directly to the spark plug, eliminating the need for plug wires. Due to variances in COP design among auto makers, spark control, troubleshooting and diagnostics can vary. This article is intended to provide education relative to COP, along with tips and precautions regarding testing and diagnosing engine misfire issues.
Do you fear the engine cover? Of course not. You work on late model vehicles every day, and you’re accustomed to popping them off in order to gain access to a variety of vacuum lines, spark plugs, sensors, etc.
As a mobile tech, when I get called by a shop to diagnose or troubleshoot a problem vehicle, I never really know what I will be up against. All I do know is that I will have to be on the top of my game.
A customer doesn’t generally care about whether their vehicle is in fuel control, but they certainly care if it’s not running correctly or the service engine soon (SES) light is illuminated. Accurate fuel control is needed to maintain the correct air-fuel ratio (AFR) that is supplied to the engine’s combustion chambers for ignition.
Our industry is made up of dedicated people who share a passion for all things automotive. Technicians who service vehicles on a daily basis routinely discover solutions for various repairs that go beyond what a service manual provides.