What causes loss of power?

[bevans6]

You should be able to get it to full fuel easily, with no need for any unique pressure.  The pressure of one thumb pushing simply against the pull of the return spring, perhaps 10 lbs of pressure.  I wonder if one injector is hanging up, not letting the rack go to full fuel?  2250 is about perfect for a typical no-load max speed, btw.  2000 is definitely not.  The issue between the two is rack adjustment, probably, not power - it takes no power to get the no-load speed.

The irritating thing is I know exactly how to diagnose this by disconnecting the racks from the governor and checking each injector, and how to set them again after - but that's "running the racK" and I don't think I can explain it in an email...

Brian

[Scott & Heather]

Another data point is that my mileage is 7.4 mpg consistently. That's too good for my 31,500 pound coach the way I drive it. Brian, when I'm in port Huron again I'll have to get you to cross the border and pay you to run the rack for me :-)


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[eagle19952]

I think you may have two problems, but first let me say that I think that your "improved" reading was also relatived to the fact the the engine was "warmer" but not at full operating temperature.
One problem is a dirty  injector or injectors, and in all likely hood a problem with your linkage/throttle cable.could be inj plunger height too...o
To properly tune a Detroit it's gotta be HOT,to properly check it's rpm...it's gotta be HOT.to run the rack...valves...HOT.
I think you need to chk your RPM at the crank too.
Chking a rack adj is alot easier than adjusting same....start here.
turn pages at the top....
http://miscpartsmanuals3.tpub.com/TM-9-2815-224-34-P/TM-9-2815-224-34-P0486.htm

[eagle19952]

ps how many pieces of tape are on your pulley ?

[Scott & Heather]

Just one piece of tape :-) I'm going to check fuel pressure and if that's fine I'm going to have the rack run


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