Maintenance Problems With Mercedes-Benz Glow Plugs

Written by bryan cowing
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Maintenance Problems With Mercedes-Benz Glow Plugs
The glow plugs in a mercedes help heat the combustion chamber. (pkw 838586 image by Rusty McCloud from

In diesel engines, the glow plugs are responsible for heating the combustion chamber to cause the spark that runs the engine. When something goes wrong with these glow plugs, it can be frustrating. Performing routine maintenance for these plugs will help extend their lives.


The first problem that can occur with Mercedes-Benz glow plugs is that they can become corroded. Corrosion most commonly looks like white, bluish or grey crust. If the glow plugs are corroded, the owner may be able to brush them clean with a wire brush, or simply replace them.

Power Relay

The power relay is a plastic black box bolted onto the inside of the wheel well. Similar to the glow plugs themselves, the connectors of the power relay can become corroded or even rusted. Again, this corrosion may be brushed clean or the power relay connectors can be replaced.

Weak or Blown Glow Plugs

The glow plugs themselves can become weak or even completely dead. A special machine called a multimeter can be used to test the power and function of each glow plug. If the test reveals that the glow plugs are weak (not carrying enough electrical current) or dead, they must be replaced.

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