I have been trying to adjust the idle on my truck for quite a while now, but it hasnt been working. Now when I start the truck, it idles really low (almost low enough to die), but then picks up to around 950-1000 (i dont have a tach, so im just guessing) without the throttle moving. It didnt do it until i turned the fuel screw in 1.5 turns. It still returns to idle promptly, so its not runaway. I think it might be related to the fuel screw problem ive been having. The screw threads are fine, but it wont turn in any farther. Anyone have any ideas whats wrong?

 

TTT... Nobody?

When I went to start the truck this morning it wouldnt start until I put the pedal about halfway to the floor. Then it woke up and idled too high... And it ran fine from there. It will start fine on flat ground, but not parked uphill. I havent tried downhill yet, but I will. Could it be the idle spring? And if so, how hard are they to replace? Bushy? Wannadiesel? Anyone?

 

I'm not familiar with this problem. but have you checked all of your fuel lines for cracks. the way that you are talking about being parked up hill, and idling strangely. I would check for air getting into the system first.

 

I'm with timb. Gotta be an air leak. If you pressurize the tank (use a rag on the air line, you don't want more than a few psi) the air leaks will show up as fuel leaks.

 

Thats one thing I was thinking of, but it doesnt make sense to me. Adjusting the idle following normal procedure doesnt affect the idle on flat ground at all. The engine starts, idles at what I believe to be what I have it set at, and then speeds itself up to a constant RPM, no matter what the idle setting is at. I will try pressurizing the tank just to make sure though.

 

I don't know how the governor on these pumps work so maybe somebody else can comment on this.

On our older John Deere stuff with rotary Rossamaster(sp?) inj pumps on them the governor assembly can get worn and cause a funky eratic idle. Eventually if ran long enough that way it can fail and go full wide open all the time.

 

Well, the pump is only 8 months old, so I doubt it would be that worn. I hope to get the 3200 spring soon, and I may just have to ignore the idle for now.

 

FWIW, My pump is pretty new as well. For a while, it would sometimes idle strangely...then it just quit misbehaving...maybe cause it sat on the shelf for a while? I dunno, but you may want to take the truck to where you got the pump and have them take a listen, if it's still in waranty. I tend to agree with others about a fuel supply problem. The VE will darn near draw from the tank itself without much fuss, but it will show some weird symptoms while doing it. I switched to new rubber line feeding the lift pump last weekend and I'm all thumbs up now---big difference!

g