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In a gasoline engine deposits or discoloration on spark plugs can be used to diagnose problems, for instance lean or rich running, or ignition problems. There are many handy pictures available to show the details of these conditions.

Glow plugs, while they only operate for a short time before starting a diesel engine, still stick out into the pre-combusion or combustion chamber, so are still exposed to the combustion. Can the condition of glow plugs be interpreted for diagnostic purposes?

Pᴀᴜʟsᴛᴇʀ2
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GdD
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1 Answers1

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Normally not, people are way too afraid to break them during removal. Since the specialty tool supliers catalogues are littered with "engine xyz glow plug extraction tools" they might have a point.

The only diagnose that gets regularly done is a test for conductivity or resistance.

Martin
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