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Q: Where Are the Glow Plugs Typically Located?

A: There could be as many as 10 glow plugs in diesel engines, one in each of the cylinders. The plugs are directly connected to the engine control unit to determine when to turn them on or off and how much current is required to heat them.

Glow plugs are common in diesel engines equipped with a precombustion chamber.

car glow plugs location in diesel engine
There could be as many as 10 glow plugs in diesel engines, one in each of the cylinders.

They use 12 volts from the battery to heat incoming fuel and air for more efficient fuel combustion in a diesel engine.

The powertrain control module controls most glow plugs in newer vehicles. The glow plugs turn on or off, depending on the engine’s temperature.

Tips on How to Access the Glow Plugs

Before you access the glow plugs, make sure you remove the cover to expose them. Afterward, it’s recommended to soak the plugs in WD-40 lubricant (spray it when the engine is warm) and leave it for a couple of days.

See also  P0673 Code: Cylinder 3 Glow Plug Circuit Open

Use a 10mm socket and a wrench to loosen the glow plugs. Take your time in removing them to prevent them from snapping.

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CarParts Research Team
Written By Research Team

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The Research Team is composed of experienced automotive and tech writers working with (ASE)-certified automobile technicians and automotive journalists to bring up-to-date, helpful information to car owners in the US. Guided by's thorough editorial process, our team strives to produce guides and resources DIYers and casual car owners can trust.

Any information provided on this Website is for informational purposes only and is not intended to replace consultation with a professional mechanic. The accuracy and timeliness of the information may change from the time of publication.

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