Nah its not a lifter, it would sound like someone is nailing your valve cover with a mini sledge if one was sticking that bad. Heck you would probably wipe the cam out.


You crack injectors to take that cylinder off line. If you crack number one and nothign changes you know number 1 has something to do with the rough running. Keep going, and you will probably have to do it several times.

If every time say number 1 and 3 produce no change you know something is up with those injectors. If they all check out fine its an IP problem.

However if you cannot isolate the cylinder than most likely its IP related.

I doubt its something like an air leak since it goes away, and its not GP's.

Edit: don't bother ordering rebuilds. You need to find your local diesel injection shop and have them test yours for spray pattern and pop pressure. Thats what matters. Rough running usualy means your pop pressure is messed up. Even ordering 6 new nozzels would be pointless(and a waste of money) without a way to check them. Most likely only a few are bad, rebuild the bad ones, leave the rest.

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