Diesel runs but won't rev up.

[fatmobile]

Turn in the max fuel screw and see what happens.

[8v-of-fury]

i do not think the max fuel screw would hinder the ability to leave idle.. but it is worth a try.

[Mark(The Miser)UK]

i do not think the max fuel screw would hinder the ability to leave idle.. but it is worth a try.

Definitely does... whilst experimenting I used the max fuel screw backed off to reduce the revs and got it down to 250rpm However at this point the accelerator won't rev. A good test for fuel injection balance though

[8v-of-fury]

Alright, well he has a normal idle on his car. and it bogs when you go to rev. The accelerator is trying to do something, but something is holding it back.

[ORCoaster]

Does it bog down from too much fuel, a restriction in the line or lack of fuel.  All seem to be classed as bogging down.

[Mark(The Miser)UK]

If there is too much fuel at the wrong time etc, then it will come out either black, or as white smoke if not contributing to propulsion.

[burn_your_money]

It could be timed 180 out

[vdubspeed]

what would have the timing 180 out cause. I think he's played with the pump. The three bolts to the bracket were loose and the on the bottom was missing. The fuel screw was out like 3 turns! I hate when people mess with these things without knowing what they are doing.

[theman53]

It is a love hate when people don't know what they are doing. Sometimes it can yeild you a great car for a steal. Sometimes it fights you until it isn't worth it.
I am with you on that one though.

[8v-of-fury]

I personally love when people who are unknowing mess with their car and get it so it wont run.. means eeeaassyy pickens for me. I always go and look at the "not currently running" cars around me .

[vdubspeed]

well tonight for laughs and giggles I went out and tried to start it. With one cycle of the glow plugs it fired up like a new car! I attribute that to the ATF/fresh diesel in the pump. However...it never wanted to rev up. I ran it for about 10 minutes and though the idle is ROCK solid...it won't rev up. I don't get any smoke when I rev up either. It has excellent compression so I know that's out. The exhaust is flowing perfect. I put a new air filter on it.

I have a spare pump that I can try but I am going on business and won't be here for a few weeks.

Oh well... at-least it runs. I wasn't even expecting that!

[Dieselstink]

Sounds just like the accelerator lever is not indexed to the shaft correctly.  Pull the lever, rotate the shaft CCW until you feel spring tension and then let the shaft return gently.  The return spot is usually 1 spline too far for idle.

[rallydiesel]

Other possibility that I have seen is the governor axis shaft sleeve is seized onto its shaft by corrosion. This is the part of the pump that the spinning governor weights push against to limit the internal throttle lever travel. If this seizes from sitting for long periods, it will prevent the external accelerator arm from increasing fuel but it will still move as if normal.

The governor shaft sleeve I am talking about is the black tube surrounding by the triangular governor weights. The end of it sits against the black accelerator levers and slides on the shaft with the loose nut in this pic.

[fatmobile]

That shaft freezes, the weights don't come out and it revs REALLY HIGH when you start it.
 I've had this exact thing happen but can't think what caused it, ha.
 Other than the max fuel screw not being screwed in far enough after replacing the top.

[R.O.R-2.0]

Sounds just like the accelerator lever is not indexed to the shaft correctly.  Pull the lever, rotate the shaft CCW until you feel spring tension and then let the shaft return gently.  The return spot is usually 1 spline too far for idle.

x2..

had a pump do EXACTLY this before.. rock solid idle, no throttle AT ALL!