did i do something wrong?

[1991cummins]

ok guys, this is the deal,

yesterday i minorly minory advanced my timing, about a sixteenth.
i also grinded my afc foot down a little bit and made some adjustments to the diaphram...

for one thing, the truck is fast as ^*%&&^ now
but it doesnt wana rev down very quickly...

its really strange, if i rev it up, it slowly comes down and if i am driving down the road and just take it out of gear it hangs out at cruisin rpm for a while, if i punch it and hall *&^ and let it boost up to 40 pounds, and take it out of gear it drops like normal... could i have done something when i ground out that foot???

anything helps, thanks guys
Derek

and sorry for the book

[1991cummins]

i also turned the full power screw in quite a bit, up past the chollar and on to the last few threads. could i be flirting with runaway and its doing this?

what mechanicly causes runaway? i am curious...

[Philip]

Turn the fuel screw back out some. Your close to the runaway point.

The other items you did wouldn't cause the problem your having.

[1991cummins]

ok, thanks... will do, what do you think, a quarter turn?

[Philip]

Myself I would go at least 1/2 turn. Then test drive agin. If the RPM is still hanging. Back it out some more.

[JQmile]

I'm having the same issue with my truck. With the fuel screw turned all the way up, I can't even put the truck in neutral when I am running along, or it will run up to the governor. It sucks because I gained 25hp on the dyno from that last 1/2 turn that makes it freak out. I'm going to try a bigger set of injectors soon as a way of getting more fuel in without having the pump turned up quite as much.

[1991cummins]

thats the way to go lol, plus it doesnt hurt your pump, its hard on a pump to shove fuel through a small hole, rather than flow it through a properly sized hole... from what i have heard

[1stgencummins]

I had the same thing happen to me and i backed my fuel screw out a 1/2 turn and it solved everything. but it depends how far yours is turned in. so just turn it out till it stops reving down high

[CumminsPride]

It doesn't sound like runaway to me. It doesn't do it under every circumstance. I'd say more like throttle binding associated with the pump top being removed for the afc mod. Just speculating.

[Begle1]

I shifted into neutral instead of overdrive at 2800 or so RPM the other day.

It's funny when I do that on this truck, because even after I take my foot out of it the engine stays at the same RPM, but I'm not going anywhere.

[RumbleFish]

i once shifted into reverse instead of neutral at 45mph in my 85 gasser once. i dont recommend it.