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Duramax First Generation: 2001-2004 (LB7) Discuss the first generation (2001-2004 LB7) of the 6.6L Duramax diesel engine & associated components. Engine related discussion ONLY.


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Old 06-25-2019, 12:29 PM   #1 (permalink)
Sluger17
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Need help! 6k roadtrip and white smoke

Hey guys need some help. Just started a 6000 mile road trip across the country, and I'm about a thousand miles in. I had a little bit of white smoke after warm up out of the exhaust before the trip and now on the trip there is a good amount more white smoke after she warms up. we have been pulling our 39 foot trailer. I tried to troubleshoot it and I'm narrowing things down to what I think it may be. I checked the coolant level this morning was about a quart low but that might be may just battling getting some air bubbles out of the system from maintenance prior to the trip. the upper radiator hose is not hard when hot or when cold I checked this morning she wasn't hard either. She's been running pretty good idling good, alittle bit of black smoke when getting on the highway and accelerating at about 3/4 throttle I'm running the banks Six-Gun I'm only on level three. I decided to check the balance rates with Torque Pro and I'll post the picture below. I think I may need a set of injectors at this point. It's been awhile since I use the app to check them and I had the truck in Drive, foot on the brake when I took the screenshot. This was after towing for a little over an hour. I let her idle for 10 minutes before checking The rates. The truck has 233 thousand miles on her. Any input would be greatly appreciated thanks guys.

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2003 Silverado 3500 crew cab dually LB7 233,254
K&N intake
Turbo intake horn
Rebuilt stock turbo with a billet 11 fin wheel
Banks bighead Watergate actuator
Driver side full flow manifold
3 inch down pipe
4 inch from down pipe back
Pacbrake exhaust brake
Banks Six Gun running on level 3
AEM water/meth injection
Word of lift pump
ATS stage 2 Allison with their TQ Converter
Boost, EGT, Rail pressure Gauges.
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Old 06-25-2019, 01:11 PM   #2 (permalink)
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Quote:
Originally Posted by Sluger17 View Post
Hey guys need some help. Just started a 6000 mile road trip across the country, and I'm about a thousand miles in. I had a little bit of white smoke after warm up out of the exhaust before the trip and now on the trip there is a good amount more white smoke after she warms up. we have been pulling our 39 foot trailer. I tried to troubleshoot it and I'm narrowing things down to what I think it may be. I checked the coolant level this morning was about a quart low but that might be may just battling getting some air bubbles out of the system from maintenance prior to the trip. the upper radiator hose is not hard when hot or when cold I checked this morning she wasn't hard either. She's been running pretty good idling good, alittle bit of black smoke when getting on the highway and accelerating at about 3/4 throttle I'm running the banks Six-Gun I'm only on level three. I decided to check the balance rates with Torque Pro and I'll post the picture below. I think I may need a set of injectors at this point. It's been awhile since I use the app to check them and I had the truck in Drive, foot on the brake when I took the screenshot. This was after towing for a little over an hour. I let her idle for 10 minutes before checking The rates. The truck has 233 thousand miles on her. Any input would be greatly appreciated thanks guys.
Tell us a little more about your truck.
( Year, Make, and Model) and list any known mods.

This info will help the other members give you better diagnostic or repair advice



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Old 06-25-2019, 01:42 PM   #3 (permalink)
Sluger17
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Sorry I was trying to post while on the road.

2003 Silverado 3500 crew cab dually
LB7 233,254 I bought it at about 207k
Looked fairly unmolested when I bought it since then.
K&N intake
Turbo intake horn
Rebuilt stock turbo with a billet 11 fin wheel
Banks bighead Watergate actuator
Driver side full flow manifold
3 inch down pipe
4 inch from down pipe back
Pacbrake exhaust brake
Banks Six Gun running on level 3
AEM water/meth injection
Word of lift pump
ATS stage 2 Allison with their TQ Converter
Boost, EGT, Rail pressure Gauges.
Fresh fluids before the trip

Airbags
B&W fifth wheel
Pulling a 2017 Heartland Elkridge E365
Hit the scales at 22,520

That's all I can think of off the top of my head. Let me know if ya'll need anymore info. Thanks again.
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2003 Silverado 3500 crew cab dually LB7 233,254
K&N intake
Turbo intake horn
Rebuilt stock turbo with a billet 11 fin wheel
Banks bighead Watergate actuator
Driver side full flow manifold
3 inch down pipe
4 inch from down pipe back
Pacbrake exhaust brake
Banks Six Gun running on level 3
AEM water/meth injection
Word of lift pump
ATS stage 2 Allison with their TQ Converter
Boost, EGT, Rail pressure Gauges.
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Old 06-25-2019, 02:12 PM   #4 (permalink)
lynn1130
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6 and 7 don't look good at first blush and 1 and 2 are so-so. If you are hazing at idle you may want to check the oil level and the paper towel test may tell you if there is fuel in the oil.
Take a reading after warm up at idle and then again with it in gear (foot on the brake) and idling. It has been awhile but as I recall you do not want to see numbers over 4 at idle and or 6 in gear.

The next is probably going to be a return rate test. Mine did not make oil when the injectors went but it did start using oil. If it has never had injectors redone someone was lucky.
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Old 06-25-2019, 03:16 PM   #5 (permalink)
Sluger17
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Just stopped for fuel and checked the oil level it is full and black. Did my best to get a couple drops of oil on some paper towel.
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2003 Silverado 3500 crew cab dually LB7 233,254
K&N intake
Turbo intake horn
Rebuilt stock turbo with a billet 11 fin wheel
Banks bighead Watergate actuator
Driver side full flow manifold
3 inch down pipe
4 inch from down pipe back
Pacbrake exhaust brake
Banks Six Gun running on level 3
AEM water/meth injection
Word of lift pump
ATS stage 2 Allison with their TQ Converter
Boost, EGT, Rail pressure Gauges.
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Old 06-26-2019, 05:03 AM   #6 (permalink)
sfcjones
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I would check oil level often, keep a eye on everything else and enjoy the vacation. I put almost 16k miles on my old 04 LB7 before I did injectors and when I sold the truck it had over 455k miles.
The biggest deal is if you suffer a crack injector body and start making oil. You are pulling heavy so I wouldn't be rough with the truck. I am assuming the white smoke is at idle and if so I wouldn't let it idle for extended periods of time.
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Old 06-26-2019, 02:32 PM   #7 (permalink)
Sluger17
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This morning I checked the oil level it's still full but not over filled. I also took 2 more balance rate screenshots one after she warmed up at idle in park and one in drive with foot on the brake. The upper radiator hose felt a bit stiff this morning when she was cold I could still squeeze it fairly easily. The coolant was only about 1/2 below the cold full line. Yesterday on drove 675 miles. I have a shorter drive the next 2 days but if I need to replace something I will have the time and facilities to do so on the 1st. The first screenshot is in park and the second drive. The truck kinda feels like it has a lite lope at idle. The majority of the white smoke is at idle. It's hard to see if there is white smoke while driving but I'll try and see today. I only let her idle about 3-8 min to cool off after getting off the highway. Again I appreciate the help guys.
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2003 Silverado 3500 crew cab dually LB7 233,254
K&N intake
Turbo intake horn
Rebuilt stock turbo with a billet 11 fin wheel
Banks bighead Watergate actuator
Driver side full flow manifold
3 inch down pipe
4 inch from down pipe back
Pacbrake exhaust brake
Banks Six Gun running on level 3
AEM water/meth injection
Word of lift pump
ATS stage 2 Allison with their TQ Converter
Boost, EGT, Rail pressure Gauges.
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Old 06-26-2019, 07:19 PM   #8 (permalink)
sfcjones
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I think you will be Ok. Enjoy you vacation and fix the truck with new injectors when you get back home. Talk with Brent at LDS or someone reputable and they will provide you with solutions
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2009 Chevy CC 2500HD LTZ LMM Z71 283k miles
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Old 06-27-2019, 03:10 AM   #9 (permalink)
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Quote:
Originally Posted by sfcjones View Post
I think you will be Ok. Enjoy you vacation and fix the truck with new injectors when you get back home. Talk with Brent at LDS or someone reputable and they will provide you with solutions
I’d agree, not making oil, if oil pressure is good and motor and transmission staying within limits you should be ok.
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Old 06-27-2019, 10:16 PM   #10 (permalink)
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Find an auto parts store and buy several 80 oz jugs of Power Service Diesel Kleene. Pour 1/2 bottle into you tank for first treatment and then use about 1/4 bottle per fill up for about 1000-1500 miles, keep track of your oil and check you balance rates after each tank of fuel to see if they improve. If your injectors are carboned up and not spraying a good pattern, there is a good chance your smoke will clear up and your balance rates will improve. Please check back and let us know if this helps. I have helped many others including myself with this technique.

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