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Old June 24th, 2013, 07:04 AM   #1
Tizken
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Looking at a used Duramax

I looked at a 03 Chevy Duramax this weekend, had about 120,000 miles on it and body and interior is in great shape. But looking under the hood it has a K&N filter on it and is missing the plastic covers over the engine. It also seems a little slow but not really sure what to expect. Is there any easy way to tell if the injectors have been replaced or the engine been worked on? Without knowing the previous owner I don't want a truck that has been modified much at all.
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Old June 24th, 2013, 07:30 AM   #2
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Go to a dealer with the VIN. They should be able to give you the history on it. 03's had an extended coverage for the injectors. I think it was 7 years or 200K. I would guess they have already been replaced at some point. I would pay somebody to test them before I bought it. They get like 4000 to replace them.
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Old June 24th, 2013, 07:45 AM   #3
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Why do people put K&N filters on diesel engines that have not been modified? I know with the power strokes, the stock air filter flows a ridiculous amount of air, and can hold 3# of dirt. They last 100,000 miles.

My rule, is never buy anything with a k&n filter. If somebody was trying to gain extra power by doing that, what else did they do that you can't see?
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Old June 24th, 2013, 07:55 AM   #4
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I don't know about the K&N air filter deals. Everything under the engine on my truck is bone stock minus the programmer. I would say, get the VIN checked out at a dealer, or if you are serious about the truck, pay for a carfax (don't ask for a freebie on here). I don't know what the 03 had. One of my diesel douche buddies would know though. I think it's either the LB7 or the early LLY. LB7's had injector problems. As nTaylor44 said, they had an extended coverage on them.

120k is nothing for a diesel. My 2006 LBZ has 264k and it runs like brand new. I also run Standyne performance formula diesel fuel additive every fill up to help keep my injectors clean and working at 100%. If you do end up getting a Duramax, I highly recommend using Standyne just by the personal expedience I have had with it.
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Old June 24th, 2013, 08:23 AM   #5
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Its an lb7. My 03 has a factory replacement k&n filter. I gained 2mpg with that filter compared to the fram filter. I will continue to use that filter. No k&n on any offroad vehicles though. I use 1-2 quarts of atf per tank. 200k and get right about 19.5-20.5 on the highway. With exhaust, programmer, filter. That's not city only highway.
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Old June 24th, 2013, 08:40 AM   #6
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I put a k&n on my Cummins. Never again, in less than 5000 miles my turbo sucked all the oil out of the filter. Be careful of turbo charged motors with oil air filters.
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Old June 24th, 2013, 09:03 AM   #7
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03 = LB7, LLY didn't come out until 2004.5. In addition to the injectors find out if the return lines were replaced. The return lines on the LB7 are inside the valve covers, so when they leak your crankcase fills with diesel fuel, truly an awesome setup.
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Old June 24th, 2013, 10:00 AM   #8
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There is a reason that NO OEs are supplying cars from the factory with Oiled filters....they dont work! They let all kinds of dirt into your engine. You gan 5hp when the filter is new and let all kinds of crap into the engines.
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Old June 24th, 2013, 10:00 AM   #9
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Its an lb7. My 03 has a factory replacement k&n filter. I gained 2mpg with that filter compared to the fram filter. I will continue to use that filter. No k&n on any offroad vehicles though. I use 1-2 quarts of atf per tank. 200k and get right about 19.5-20.5 on the highway. With exhaust, programmer, filter. That's not city only highway.
Be careful using atf in your fuel. If your tank gets dipped your fuel will have a red tint. Fuel tanks getting checked on pickups doesn't happen much but it can.
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Old June 24th, 2013, 11:45 AM   #10
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I put a k&n on my Cummins. Never again, in less than 5000 miles my turbo sucked all the oil out of the filter. Be careful of turbo charged motors with oil air filters.
Exactly! I would never use a K&N on a forced induction system. Even on and NA motor I think it's a bad idea.
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Old June 24th, 2013, 11:45 AM   #11
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Exactly! I would never use a K&N on a forced induction system. Even on and NA motor I think it's a bad idea.
But all the HP to be had
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Old June 24th, 2013, 01:35 PM   #12
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But all the HP to be had
When compared to a dirty, clogged paper filter....
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Old June 24th, 2013, 02:14 PM   #13
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For real hp gains I take the filter off and cut some screen out of my front door and rubber band it over the intake side of my turbo. It keeps the birds and stuff out that's all that matters dust and sand just burns up.
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Old June 24th, 2013, 02:52 PM   #14
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I never bothered to check my filter for a few months because the indicator always read in the green, I took the cover off and realized I didn't have a filter at all! I bet my turbo loved that! Rookie mistake!
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Old June 24th, 2013, 03:58 PM   #15
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I would highly recommend passing on the 03 duramax. I had one and had a lot of injector issues.
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Old June 24th, 2013, 04:00 PM   #16
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If you give me the vin I can run it to see if the injectors were replaced.
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Old June 24th, 2013, 04:07 PM   #17
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I would highly recommend passing on the 03 duramax. I had one and had a lot of injector issues.
I have an 03 with almost 200k and it's fine not all LB7s have injector issues. I love my truck, the only thing I dislike about it is that it's not a crew cab. I'd by another 03 (only if it was a crew cab) in a heartbeat.
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Old June 24th, 2013, 04:17 PM   #18
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I have an 03 with almost 200k and it's fine not all LB7s have injector issues. I love my truck, the only thing I dislike about it is that it's not a crew cab. I'd by another 03 (only if it was a crew cab) in a heartbeat.
I say your lucky. My first set went out around 30000 miles. A buddies dads truck went out around 80000.
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Old June 24th, 2013, 04:22 PM   #19
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Replace them and be done. No big deal really.
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Old June 24th, 2013, 04:38 PM   #20
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Other than the cost of replacing them and labor your right no big deal.
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