Thoughts on a 2004 Duramax - Chevy and GMC Duramax Diesel Forum
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post #1 of 17 (permalink) Old 06-19-2019, 01:43 PM Thread Starter
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Thoughts on a 2004 Duramax

Hi gang- Long time no talk. While I've previously owned an LMM and LML, I've never owned anything prior to the LMM. I have my eyes on a 2004 Sierra 2500 crew cab 4x4 standard box with the duramax. It has about 155,000 miles. Everything is stock as far as I know, but I will have a good pre-purchase inspection done at a trusted shop.

What are some of the issues I should look for or were trouble spots on this year of Duramax? I know that there were Injector issues when the engine first came out. Were these addressed by the time the 04s came out? Also, was the transfer case pump rub an issue on these? Anything else?

Thank you

Ryan

2012 Silverado 2500 Crew Cab 4X4 D-Max
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post #2 of 17 (permalink) Old 06-19-2019, 02:12 PM
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I know that there were Injector issues when the engine first came out. Were these addressed by the time the 04s came out?
'04 was a split year production; Some 1st gen LB7s (injectors), others were 2nd gen LLYs (head gaskets).
Check the VIN 8th digit, 1 or 2 to tell what it is.

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post #3 of 17 (permalink) Old 06-19-2019, 05:56 PM Thread Starter
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8th Digit is 1.

2012 Silverado 2500 Crew Cab 4X4 D-Max
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post #4 of 17 (permalink) Old 06-19-2019, 06:03 PM Thread Starter
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Depending on what it is- Is there any easy way of telling if the injectors or head gasket has been replaced that you know of? I test drove it. The front end is a bit worn out and needs a bit of work, but the engine is still strong and tranny shifts fairly smoothly. So that much is good. I forgot how dirty diesel can smell, I was spoiled on my last 2 trucks, they both had DPFs.. This one doesn't smoke very bad.
Do the valves require adjustment periodically? If so what symptoms would out of balance valves show?

2012 Silverado 2500 Crew Cab 4X4 D-Max
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post #5 of 17 (permalink) Old 06-19-2019, 08:32 PM
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Pump rub will still be an issue. Donít believe that was remedied until LMM or LML.

Is it the lly that had the injector ice pick issue?


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post #6 of 17 (permalink) Old 06-19-2019, 09:23 PM
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8th digit is a 1 means it's 1st gen LB7. The biggest problem was injectors. At 155k miles it is probably on it's 2nd set. I don't have an LB7 but I think the injectors are good for about 100k miles, and I don't think they fixed the longevity problem (LB7 can provide their experience!).

As stated above, if the transfer case hasn't had a preventative fix made, the pump (in most cases) will wear a pinhole in the magnesium rear tail section, ATF will slowly leak out over months, and the transfer case will be destroyed. I suppose 1 out of 100 trucks will be lucky, the clips will stay in place, and they'll never have a problem. But most will fail some time after 100k miles (and a few sooner). Research "pump rub" for more info and prevention options.

Smoke? I don't think there should be hardly any smoke unless it's been tuned or the injectors are on their way out.
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post #7 of 17 (permalink) Old 06-20-2019, 02:04 AM
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LB7 can provide their experience.
New SAC style injectors are available to retrofit, vs the older 'high-wear' design.

2007 LBZ 3500 LT3 DRW Crew Cab, Sulastics, Putnam XDR 15K, B&W 30K-Turnover GN+Companion, Ride-Rite Air...EFI'd by Rob
2008 LMM 3500WT DRW Crew Cab, 8 'Flat/GN, Workforce Alum Toolbox, Ride-Rite Air

Use-ta Haves 2006-6.0 3500 WT DRW ExCab Flatbed, 2005-LLY 3500 LS DRW Crew Cab, 2002-LB7 3500 LS DRW Crew Cab
I Live my life in such a way that when my feet hit the floor in the morning...Satan shudders & says "Oh shit, he's awake!"
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post #8 of 17 (permalink) Old 06-20-2019, 02:26 AM Thread Starter
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Thank you for the info. Any ideas on about how much the new injectors cost?

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post #9 of 17 (permalink) Old 06-20-2019, 02:35 AM
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Originally Posted by GoBlowSnow View Post
Thank you for the info. Any ideas on about how much the new injectors cost?
Lincoln Diesel has the updated injectors new at $2712. There are other less expensive options but that is what I would buy if it were me.

https://lincolndieselspecialties.com...injectors.html

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post #10 of 17 (permalink) Old 06-20-2019, 10:12 AM Thread Starter
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Thanks. The injector thing is what has me worried the most. I'll likely pass on this truck even though it is priced... fairly.. I'll keep an eye out on a good LLY or newer.

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