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      12-21-2012, 12:39 PM   #5
Dr Dave
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Quote:
Originally Posted by creepy coupe View Post
Yes they basically help warm the fuel when coolant temperature is below 30 degrees
Not totally correct; the glow plugs on a modern direct injection CI engine aid the smooth running and more importantly the exhaust emissions during a cold start. Truck engines (again, all DI engines) don't have glow plugs.
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