02 LB7 really PI$$!NG me off! No power! - Page 3 - Chevy and GMC Duramax Diesel Forum
01-04.5 LB7 Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect

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Old 11-19-2012, 06:39 PM   eBay Motors  #21 (permalink)
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I work nights so is there anyway to tell if I have a boost leak with how much psi I'm reading? I'm planning on just pulling the tubes off to get a close look at them and the boots. I don't have a tec II and really don't want to look at the injectors or cp3 but if it is one of them I hope the cp3 is still under warranty! The local Chevrolet dealer put it on a few months ago when the previous owner had it and let's just pray injectors are good. I don't mind the labor but 1800 dollars for something guaranteed to go back out is just stupid
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Old 11-19-2012, 08:12 PM   eBay Motors  #22 (permalink)
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Okay went out to the truck on break and felt the ic tube. It has wear but not all the way threw it !!! I did notice it seems like the rubber ends is soft as shit. Is it supposed to be so easy to wiggle these tubes?!? Seems to me there might be a good chance a rubber boot is tore of something
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Old 11-19-2012, 10:44 PM   eBay Motors  #23 (permalink)
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Alright I hooked the predator up on the way home and when I went to pull a normal hill in 5th that was never a problem before it had no power. It read boost 22 psi, MAF 254 g/a, iat 64, ect 154, outside temp was 54 and the one that got me was 78% engine load! Also the turbo seems a lot louder. Boost leak?
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Old 11-20-2012, 01:22 PM   eBay Motors  #24 (permalink)
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Ok double checked everything and it looks fine. Took programmer off which took forever saying it can't communicate then took it for a spin then checked codes u1000, p0380 for glow plugs, and p1781. Could this p1781 be causing the problems??? If so what do I need to do???
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Old 11-20-2012, 05:30 PM   eBay Motors  #25 (permalink)
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Ok, the P1781 is a TCM code, low voltage or something like that IIRC. Maybe one of your batteries are low? I'm thinking that if initial voltage is too low, the TCM will throw that code, could be wrong. It could also cause other problems if your batteries are low.
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Old 11-20-2012, 08:08 PM   eBay Motors  #26 (permalink)
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One battery is maybe a 6 months old and the other is 2 weeks old. One of them had a bad cell that showed up when our cold spell hit a couple weeks and I didn't have the money to buy both at the same time like You're suppose to do.
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Old 11-21-2012, 10:50 AM   eBay Motors  #27 (permalink)
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Ahh, well. Ive gotten to were I buy the 3yr warranty batteries because they normally conch out around 2. I found, for whatever reason that the top post/side post batteries have more CCA's too, and it makes it handy having the top post.
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