Well I recently bought my 02 duramax and this past weekend I had injector failure, rough idle, tons of fuel in oil etc. The reason I bought this truck was because in September 2011 the previous owner had dealer installed injectors and injection pump. Which are covered by 12 month warranty. I called dealer yesterday to get the ball rolling on the warranty replacement, the dealer then told me that according to his records it looked like only 2 injectors had been replaced and that it was prob one of the older ones that failed. I ask if he could give me the injector numbers so I could see which one failed, he said they didn't record the ones they replaced. Am I wrong to think they should cover repair since they failed to properly document which injectors they replaced? I am still waiting to hear from service manager. Thoughts?