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Power Strokes
6.4 Tech
RP surge
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[QUOTE="B585Ford, post: 847142, member: 5497"] Thanks...and I think you are right on this one...vcv/pcv. At first it seemed to help (changing tunes), but now I can confirm multiple times that loading a new tune doesn't help and running the same tune for over 1000 miles doesn't seem to make a difference. Like I said before, every time I think it I got if figured out (some kind of pattern), it breaks the rule. Ex. On Wednesday (in the snow) I ran a backhoe from WV to Buffalo. It was surging really bad even on the Interstate when I took off. I was running Matt's tow tune w/o exh. brake since it was flat ground. During that time, I got on to an on ramp and held 24.5 RP (which I guessing is about its max desired for that tune since it is a mild tune) up to about 2500 RPM and then I shifted. As a test, I ran my tank down to 1/8 just to see if it would change anything and it didn't. I stopped in Erie to get fuel and didn't shut the truck off. After I was done fueling, the surge was almost gone for another 50 miles. I was thinking maybe the fuel I got was warmer than what was in my tank, but the rest of the night (after I had delivered one load and picked up another), it had a mild with rare moderate surge, but never like when I started (all on the same tune and I had ran about 450 miles by then). Of course, the roads were bad that night so I didn't get to test more exactly how I wanted to, but that is the only thing I can come up with. The surge is very similar to the version 0.42 surge on the MM. It is like the truck can't seem to find the right setting on much fuel to provide when I change throttle position around 1800 RPM. If I give it more accelerator or let off and it goes away and if I ease back into the throttle, it stays away. My best guess is one of those valves sometimes sticks and that throws off the adaptive learning. One other thing I confirmed...it is not the TPS because I saw the truck surge and throttle position stayed the same. It may be the "Fuel Flow" sensor (that is what H&S calls it). I am not sure what sensor that is plugged into but I tried holding a steady throttle and would see it move up to 3 at times, but I also had the surge one time where the "fuel flow" didn't fluctuate but the RP did. I don't think there is a factory sensor between the LP and HP so that sensor almost has to be between the HP and rail or it is estimating based on what the HP is doing. Any idea exactly where and how the "fuel flow" gets its reading? [/QUOTE]
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