Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
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I am a die hard GM guy also and am also a huge fan of the duramax. GM did a lot of things wrong with the early version. If you do some research you will find that the 02 had a really bad reputation for injectors. Good news is now you can purchase a set for less than 1K. It is a big job but not real difficult. If you intend to keep this truck purchase a tech 2. a chinese clone would work for this vehicle. you can find them less than 300. The injectors do need the flow rate set when they are replaced. requiring the tech2. The first upgrade I would do would be an airdog lift pump and water separator. The 02 is not filled with emissions restrictions so there is not a lot to remove to get some power.
As far as testing the injectors: If there is fuel in the motor then there are injectors in your future. follow link for purchase. I am in no way affiliated with this company. just some research and seem like a good combination.
I dont think they are warrantying them anymore. It would be worth a call to a dealer. Would not matter you are not original owner. The injectors spray directly into the cylinders there is not a good way to determine a leak without a scanner. As I stated the 02 does not have the emissions on it that can be removed to increase power. The first upgrade I would do would be a lift pump with a 2 micron fuel filter like the air dog. This will prevent a second set of injectors. The next move would be to remove the exhaust and put a full flow system on it. No Cat or muffler.
there is a lot of cold air boxes available. I have not seen where they are effective
The only fuel pump from the factory is the CP3 pump which is a suction pump. It is not designed to suck fluid the distance from the fuel tank causing premature failure of the CP3. The lift pump and fuel filter is mounted to the frame rail and goes inline with existing hoses. You will notice immediate improvement in power and fuel mileage. I recommend the Airdog 100. I have installed several and have been quiet and trouble free.