How to Tell If a Mercedes Glow Plug is Bad?

Answer Mercedes diesel engines use glow plugs instead of spark plugs to start the combustion process. An electrical current is sen into the glow plug, where resistance causes the glow plug to heat. The he... Read More »

Top Q&A For: How to Tell If a Mercedes Glow Plug is Bad

How to Change a Glow Plug on a Mercedes 300SD?

A diesel engine relies on the compression of fuel and air during the combustion cycle. Combustion efficiency is reduced when a diesel engine is cold, so glow plugs heat the engine block and cylinde... Read More »

How to Test a Mercedes Glow Plug Relay?

Glow plugs heat the cylinders in diesel engines to help start them. The glow plug relay uses a small amount of electrical current to close contacts to supply higher current to the plugs. If you sus... Read More »

How to Remove Glow Plugs in a Mercedes?

Glow plugs in a Mercedes are used in place of spark plugs. This is because Mercedes uses a diesel engine instead of a regular gasoline engine. Glow plugs heat the fuel inside the combustion chamber... Read More »

How to Remove Glow Plugs on a Mercedes 300D?

Diesel fuel reacts differently to low temperatures than gasoline. Diesel fuel tends to gel up in colder conditions. To solve this problem, diesel engines like the ones found in a Mercedes 300D use ... Read More »