Been haveing problems for a long time. The eng. surges eradict but only slightly. When at hwy speed say 65 you let off and rmp get to about 1500 then put it in nuteral rpm drop quick to about 700 then pick back up,if A/C is on it almost dies. No white smoke no black smoke fuel mileage is normal. And when you rev up the eng. then it starts droping it has a little rev up right before idle. I here common rail motors do this, why would a vp motor do this. I changed the inj. to 75 hp and it started this so I had rv 275's rebuilt and put them back in and still the same no change.I dont no if this means anything but rpm gauge bounces a little at idle. Also I loosen inj. lines so there would not be any problem with cross over tubes lineing up with inj. and retighten. I always wash eng. where inj. lines go into head so there is no dirt getting in there. I dont know how much more I can do.
Thanks for your help.
Joe

 

Whats your fuel pressure?

 

try un-hooking your edge box and see if that helps

 

Fuel pressure is 15 lbs. I disconnected Edge and no change.

 

Well JL Welding you sure do get around...

Believe it or not I've talked to him quite abit about this problem but I've run my typical stuff and his bases have been covered.

 

if the apps has been adjusted, id start saving for a new vp

 

Yea I must say there have been a lot of meeting of the minds on this I just wish something would break so I can say now I know what it is. I think I will buy new apps,just because it has so many miles on it and just see what that does, what can it hurt right.

 

If your getting a new Apps then i would get the Timbo apps. I've heard nothing but good things about it.

 

have heard in the past on someone elses 24v that the it was the carnk posistion sensor causing something similar to your problem.