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Frequently Asked Questions

Questions, News and Updates Regarding Glow Plugs

What are glow plugs?
Glow plugs can be utilized in any application where a source of intense heat is required either to directly initiate or aid in the initiation of combustion. Glow plugs are used in space heaters, and in diesel engines at cold starting.
What types of glow plugs do you offer?
WAP, Inc. manufactures metal sheath and open coil glow plugs.
What is the difference between metal sheath and open coil glow plugs?
Metal Sheath Glow Plugs do not have an exposed coil.

Open Coil Glow Plugs have an exposed coil.

How do you test a glow plug?
The best way to test your glow plugs is with an ohm meter. Place one lead on the terminal and the other on the heating element. If it registers 0.00 then the part is bad.
Are glow plugs available for other industries?
Yes! Non-automotive applications are available. These include agriculture and off highway equipment. We can produce plugs for any application, if business warrants it.
What is an "all ceramic glow plug?"
These plugs are starting to show up in newer applications. They are a Silicone Nitride heating element instead of the traditional metal sheath. WAP, Inc. hopes to unveil their line of ceramic plugs in early 2007.
2004 Powerstroke Update
In 2004, Ford/International Truck and Engine made a change to the Powerstroke engine. They are saying the change over was in 2004.25. The change affects the overall length of the glow plugs. The only way to determine the difference is to check the ENGINE serial number. This number can be found on the engine block near the head. The engines numbered 0000001-6155636 use the GP540 plug and engines 6155637 and up use the GP541. PLEASE check every 2004 Ford Powerstroke and International engine. Top of Page icon

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