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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 12-17-2019, 12:51 PM   #1 (permalink)
RJR88
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03 LB7 balance rates, coolant temp questions

Hello everybody, a few questions I have about my new to me Duramax. Here are a few photos to help with my questions as you can tell, fuel rail pressure seems to be fine which eliminates the need for me asking about a lift pump right now. Currently have the Bluetooth OBD2 reader with the torque app and figured out how to get my balance rates working thanks to this forum. 247xxx, starts fine in the cold.

1. After looking at the balance rates am I in danger of melting anyting with that high of a balance rate as I currently do not have the funds to replace the injectors. Should I stop driving the truck? She is my daily driver right now and probably commute 6280 miles a day. Never mind I cannot post a photo so I will just tell you.

The worst is cylinder 4 at 9.9 (has gotten to 11.6 before) cylinder 3 -3.9
And cylinder 8 is around -4.5

2. Engine temp on gauge cluster rarely exceeds the first quarter hash mark (185) but torque app reads about 150-165 on avg) not sure why though.

A preemptive thank you for all your time and consideration to read through this and try to give me your words of wisdom and input as my intent is to keep this truck for the Long Haul. Also has Allison a1000 tranny in it so as far as I'm concerned there's nothing wrong with that issues wise.

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Old 12-17-2019, 01:22 PM   #2 (permalink)
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Forgot to mention that I'm using Diesel Kleen it about every tank as well. Could this be the cause? Asking as if maybe I'm cleaning them too much and this is why the injector rate is at 11. I don't think this would be the problem but I don't know enough to know better.

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Old 12-17-2019, 01:23 PM   #3 (permalink)
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Old 12-18-2019, 02:12 PM   #4 (permalink)
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If you have an LB7 you need to set aside cash for injectors unless you have proof of when they where changed and proof of the injectors that were used. Lincoln Diesel sells SAC style injectors which should improve their lifespan. I personally would not drive a truck with injectors dumping fuel but you don't mention excessive smoke or noise. I would send an oil sample in to have it analyzed for fuel contamination. If an injector is stuck and dumping fuel it will show up. Your fuel rail pressure really will not be effected by a lift pump. The lift pump will change the fuel system from vacuum to pressure to the CP3. It will also help prevent collapsed fuel lines and help diagnose areas where you could possibly be sucking air under vacuum and add extra filtration. Your fuel rail pressure is 25KPSI for example while the lift pump pressure to the CP3 is 10PSI.
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Old 01-15-2020, 07:59 PM   #5 (permalink)
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I put to much Diesel Kleen in once and it made my truck smoke, had one injector go to 8-9. Backed off on it and made sure to get good fuel and have had no problems since. The injector is usually around 1.5-3 now
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