VIDEO: Inspecting Spark Plug Appearance

VIDEO: Inspecting Spark Plug Appearance

A spark plug can reveal short- and long-term problems if you know where to look. This video is sponsored by Autolite.

The electrodes and porcelain of a spark plug can reveal short- and long-term problems if you know where to look. OEMs consider the spark plugs a part of the emissions system on most modern vehicles.

Oil fouling of a spark plug typically results in a shiny, black appearance. If enough oil is in the combustion chamber, the deposits can build up on the tip, porcelain or shell.

If you can’t determine if it is carbon or oil fouling, smell the plug; it will smell like engine oil. The oil can come from the piston rings, valve stem seals or the positive crankcase ventilation (PCV) system.

Malfunctioning PCV systems are becoming a leading cause of oil fouling in modern engines. These systems have become more than just a spring-loaded check valve. Modern systems can separate oil from the crankcase vapors and electronically regulate when the engine ingests the vapors. If the PCV valve is stuck open, the excess vapors and oil droplets can quickly foul the spark plugs.

This video is sponsored by Autolite.

You May Also Like

What Are Direct Ignition Coils?

The stick coil eliminates ignition wires and utilizes wasted space by fitting neatly into the spark plug bore.

Ignition coils transform battery voltage into the higher voltage needed to jump the spark plug gap and efficiently ignite the air-fuel mixture in an engine.

Direct ignition coils are by far the most common type of ignition coil found in modern direct ignition systems, and they’ve been adopted by most of the major automakers. In this design, the coil mounts directly on top of the spark plug, eliminating the need for an ignition wire.

Protecting Tools and Equipment from Rust and Corrosion

Rustgard’s protective coating preserves their life and functionality.

Recommending Antifreeze/Coolant for Heavy-Duty Engines

There are three basic formulations of heavy-duty antifreeze/coolant.

Addressing Problems with Limited-Slip Differentials

If the frictional properties aren’t correct, abnormal clutch engagement and disengagement called chatter will occur.

Eliminating Torque Converter Shudder in Automatic Transmissions

It can be difficult to determine if shudder is a fluid-related issue or a costly mechanical problem.

Other Posts

NGK Spark Plugs USA Announces New Company Name, Logo

The corporation chose the new name, logo and colors to present a broader image of its modern identity.

MEMA Leaders Chat About the Future on ‘AMN Drivetime’

MEMA leaders sat down with Bill Babcox to share a few updates on the realignment of the association announced in November.

Taking a 4-Corner Approach to Selling Ride Control

Shocks, struts and springs operate in conjunction with each other. 

Recommending OE-Quality Ignition Coils

Your customers need an OE-quality replacement coil that’s designed to withstand extreme operating conditions.