I have a K008 with a D722 that I bought at an auction recently and I did change all of the filters and lubricants. The machine seems to run fine under load and I would not suspect that there is a problem except for a noticeably rough idle. I did spend considerable amount of time troubleshooting this issue and I was not able to figure it out. I used an IR camera to check the heat signature on the exhaust manifold (when the engine was cold to warm up) to see if there is any variation and I noticed that cylinder 3 is doing most of the work while cylinder 1 is almost completely cold. I then swapped the injectors between cylinders 1 and 3 and the result was the same with cylinder 3 still the hottest. I then proceeded to crack the fuel lines to the injectors and the result was that cylinder 1 had no impact when the line was loosened and when the line was cracked on cylinder 3 the engine sputtered badly and almost died, and cylinder 2 had minor impact. I also removed all three fuel lines completely to see if there is fuel squirting from all three pump ports when engine is cranking and there is fuel coming out from all three, and it seems relatively even. However I cannot determine whether there is sufficient fuel coming out just by looking at it. I also checked the compression and its 450PSI on all cylinders. So I'm not sure what else to try. I did remove the injector pump and I checked the springs and pistons for any physical damage and I did not find anything obvious. Can the pump be faulty in this case? I would hate to spend a considerable amount of money on a new pump just to try and see if it improves things. Any ideas would be appreciated.
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