Chevy/GMC Duramax 01-04 LB7 Discussion of Chevy and GMC Trucks with LB7 Duramax Turbo Diesel Engines

2003 lb7 white smoke

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Old 11-21-2010, 11:53 AM
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Default 2003 lb7 white smoke

after replacing injectors had one cup come out cleaned and reinstall. no smoke at start up but starts after worming up. if this problem is injector cup or cups can i remove glow plugs and pressure test cooling sys. to find which cyl . is leaking
 
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Old 11-21-2010, 09:34 PM
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yes, you need a pressure level (long piece of plastic tubing with red food colouring and attach it to something in a U shape) and remove your temp sensor (ontop of your thermostat housing), use a pipe fitting that threads into the hole, and attach it to the tubing, i removed all the glow plugs, and then turned the engine over by hand until a cylinder reached TDC, attached the compressor to a fitting that threaded into the GP hole and pressured the cylinder, if the fluid in the tube moved even slightly you have an air leak in your coolant, most likely head gaskets
 
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Old 11-24-2010, 07:08 PM
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thanks for info. will be working on it this weekend
 
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Old 12-01-2010, 06:50 PM
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to all that read this i found bottom of fuel filter leaking at o ring for water seperator tighten water sw and test run truck all is ok thank you
 
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Old 12-02-2010, 03:14 PM
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still smoking?
 
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Old 12-02-2010, 07:46 PM
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no smoking at this time truck run good getting about 18 mpg thanks
 
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