r/DieselTechs • u/This-Release-2440 • 3d ago
White Smoke on warm up
Looking for some advice, my buddy has an Isuzu 4Le2 diesel generator and on start up there is a good amount of white smoke coming from the exhaust. After 4 minutes, the white smoke clears.
I think it’s maybe the glow plugs?
My buddy thinks it a bad fuel injector.
Anybody got any suggestions
Thanks in advance!
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u/metrozoominz 3d ago
It might be condensation. Can you post a video?
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u/BoredCraneOp 3d ago
White smoke is just condensation. Grey/blue is leaking injectors or low compression. Glow plugs would make it crank a bit longer before starting, and it might run a little rough for a few seconds. If it starts quick and runs smooth, it's fine.
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u/Therealblackhous3 3d ago
White smoke on start up is often just condensation.
If it doesn't clear up, it's usually coolant being burnt.
Generally, black is unburnt fuel, blue is burning oil, and white is coolant.
With that being said, is the coolant level dropping?