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How to Test Glow Plugs on a Diesel Engine (Step-by-Step Guide)

Hard starts in cold weather are one common diesel complaint.

And a lot of times, it comes back to one thing:

Glow plugs not doing their job.

Glow plugs are responsible for heating the combustion chamber so the engine can start when it’s cold. If one or more fail, you’ll start seeing issues like long crank times, white smoke, or rough startup.

The good news is: testing them is straightforward if you follow the right process.

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