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A diesel engine uses the heat of compressing air to ignite the fuel instead of a spark plug like a gas engine. When it is cold it takes a bit to get enough heat to get it to fire. Ford diesels use a glow plug to heat the air when cold starting, but on a Cummins they don't use them. A simple block heater should make it easier to start when it is cold.

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Q: What causes a 5.9 liter diesel to turn over multiple times before it cranks when it is cold?
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