A little fuel pump settings help?

[410]

I had a similar issue with one of my mtdi pumps.  I narrowed it down to the number 3 high pressure line draining slightly.  See if you can narrow down which cylinder isn't firing on start up by putting your hand on the exhaust manifold.  The exhaust manifold will heat up the slowest near the cylinder not firing.  As long as you're careful you won't burn yourself.  It heats up at a fairly slow pace and diesels don't produce that much heat at idle.

[iamdieselnutmechanic]

I am not sure it is a not firing issue, but i will check that.

Its definitely weird.. I'll get a video/soundclip of a start and idle.

What is acceptable idle? Cause it seems to me, anything below 1000 is where it has issues.

[410]

I am not sure it is a not firing issue, but i will check that.

Its definitely weird.. I'll get a video/soundclip of a start and idle.

What is acceptable idle? Cause it seems to me, anything below 1000 is where it has issues.

If it has a hard time idling under 1000 rpm, you might be out of the working range of the governor flyweight assembly in the pump.  A couple things can affect this.  You can try installing a thinner button shim that goes between the rotor and the camplate but going this route means resetting most of the pump settings and you have to take the head of the pump off to get to it.  Or you can add a shim behind the governor flyweight assembly to move the whole assembly towards the governor lever.  This is much easier to try since it can be done from the top of the pump and it doesn't take much of a shim.

The other item to look at to deal with a rough idle is the idle spring on the caged governor spring assembly.  A lighter spring might help smooth the idle out a bit.