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No they do not, After engine is running there is no need for glow plugs because there is enough heat in the cylinders to warm the fuel.

The glow plugs are designed to heat up the cold diesel fuel on start up only.

Actually glow plugs will cycle briefly after engine start up to keep the cold fuel from bringing down cyl temp until the engine warms up. A power stroke will keep glow plugs on for up to 180 sec. A chev will run considerably less I believe.

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Q: Do the glow plugs cycle after engine is running?
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