by cougar » Tue Jun 19, 2012 9:04 am
Just thinking out loud here so don't shoot me.
Fly weights
Governor spring
Manual fuel shut off
The governor spring balanced the centrifugal force on the fly weights maintaining the correct (or metered) amount of fuel for that RPM. When the fly weights and spring are in equilibrium, you have a fuel/defuel state happening to maintain RPM. When you take your foot off the throttle, you go into defuel mode, right? At full throttle, you are applying a lot of governor spring force to hold the flyweights in balance. Thing of what happens when you "side step" the throttle. It's going to slam the governor into defuel mode big time. Now think of how the manual shut off works. It manually pushes the governor through defuel into fuel dump. This may be what is happening when you side step the throttle after a full power run. Your putting the governor into cut off instead of defuel. That will allow air into the injectors, much like running out of fuel.
RIP 91.5 W250 5 speed. The great experiment.
92 W250 HD 47RH with Compushift. Upgraded H1C to 62/60/16, Scheid Lightning VE, 60# valve springs, DAP 7X.010 injectors, 4" DE exhaust, home made cooler tubes.
01 2500 "the work truck".