Duramax Diesels Forum Truck of the Week
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Old 05-19-2018, 06:08 PM
dcpjfs432 dcpjfs432 is online now
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Default I bought a lb7...

So I just bought a GMC Sierra 2500hd lb7
It has 180,000 miles on it. What do you guys suggest I should do it has a k&n intake but I don't really think that is good for it should I change it? Any other things I should change on it?


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Old 05-19-2018, 07:32 PM
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It’s up to you. What do want to do with it?
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Old 05-19-2018, 07:56 PM
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Change that fuel filter asap. Just to be sure. See what comes out of it.
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Old 05-20-2018, 04:53 AM
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Originally Posted by duramax on fire View Post
Change that fuel filter asap. Just to be sure. See what comes out of it.


Definitely going to do that and do all the fluids. And I am going to do a lift pump probably a fass 150.


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Old 05-20-2018, 05:21 AM
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As Albert asked, what are your goals with the truck?
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Old 05-20-2018, 05:33 AM
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As Albert asked, what are your goals with the truck?


I am just going to use it as a daily driver and to tow cars back from auctions every once in awhile.


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Old 05-20-2018, 07:07 AM
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Full service of all the fluids and filters. Ck balance rates on injectors and cp3 health. 50-100 hp tune, ditch the k&n if your driving in dusty conditions (stock air box supports over 500hp), 4” exhaust or stock is fine, boost and egt gauges, boost valve for stock waste gate.

If your power hungry start saving for a built transmission, 4500-5500 bucks.

Injectors will always be an issue on the lb7. Always be prepared to change all 8. Good Bosch remans will go 100k give or take. The new SAC style lb7 injectors should last longer but haven’t been out long enough to prove or disprove that theory. 2500 for injectors and the labor if you can’t do them yourself.

That’s my starter list. Is it a Cali emissions lb7?
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Last edited by Burn Down; 05-20-2018 at 07:13 AM.
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Old 05-20-2018, 08:09 AM
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I'm not big on the fass pump. To much money and I don't like how it constantly cycles fuel threw the filler neck. I run Kennedy pumps and a cat pre filter 1r0750


I left mine stock had plenty of power for me. My lbz had the cat and muffler cut off. Love the sound. I would recommend that. But you shouldn't have a cat unless it's a stupid cali truck
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Old 05-20-2018, 05:17 PM
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I don't have a cat. So I assume it's not a California emissions truck. Right now I cut the muffler off so it is straight piped eventually I would like to get a 4" straight pipe. But I want to get the engine codes fixed first the codes that show are a p0087 low fuel rail pressure. What would be the best way to diagnose that? I also have a overboost code also wondering how to fix that? Thanks in advance


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Old 05-20-2018, 08:25 PM
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Start with codes first next time. No sense messing with anything else until those are repaired.

Is the truck tuned? To much pulse with no lift pump can cause p0087. More than likely it’s bad injectors or weak cp3.

Overboost, is the truck tuned? Is the turbo and waste gate stock?
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Old 05-21-2018, 04:53 AM
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Quote:
Originally Posted by Burn Down View Post
Start with codes first next time. No sense messing with anything else until those are repaired.

Is the truck tuned? To much pulse with no lift pump can cause p0087. More than likely it’s bad injectors or weak cp3.

Overboost, is the truck tuned? Is the turbo and waste gate stock?


No the truck is not tuned I don't know if it was before me. the guy who owned it before ran a shop so he kept up on the maintenance but I bought it at a auction for $1900 so I knew it would need some work possibly injectors. I'm not sure if the turbo is stock.


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