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Re: 720D cylinders firing unevenly when not under load
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After making certain things like the filters are serviced, the screen in the sediment bowl is not clogged over with old diesel goo, I would check the timing on the pumps. Then I would run it, and loosen either injector line first, see if the miss goes away, then try it with the other one to confirm.
Or, the better way is to just take the injectors out to have them tested, since it is cheap and easy to do. If you don't want to make that trip yet, swap them left for right and see if the miss follows the injector.
After that, look something silly like the decompression lever riding on the valves and causing problems. The front end of the service manual has a section with good tune up information that you should go through, as I normally forget to do something.
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