Hi, I'm new here and need some help figuring out whats wrong with my truck. I have a 03 cc f250 fx4 6.0 the truck hasn't thrown any codes but when accelrate hard it will stutter and act like it misses or something after 2500 rpm and higher. Its pretty violent felling like the truck is jerking. If I ease in to the rpm's it doesn't seem to do it and anything under 2500 is fine. I thought it could have something to do with my high pressure oil leak but I fixed that and am still having the issue. I have a sct x4, new headgaskets and arp studs, egr delete, 4 inch exhaust and I'm getting 48.5 volts to ficm my hpop is putting out 2800 to into the 3k's. I can rev it in neutral to in the high 3k's then it sounds like it hits rev limiter. Any idea's on what could be causing this?
6.0L PSD jerking stuttering on hard acceleration
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Did you try cleaning your turbo?
You should check you icp number under load instead of neutral. Not sure if it will change anything but it's worth to try. How's the fuel pressure?
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You should check you icp number under load instead of neutral. Not sure if it will change anything but it's worth to try. How's the fuel pressure?
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I haven't tried cleaning the turbo yet, and I did check it under load and in neutral. I have the blue spring kit but haven't been able to check fuel pressure yet, I'm going to get a gauge today to check that.
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5,125 Posts
Probably a bad injector. Run a contribution test with FICM compensation disabled and see which one(s) are falling out.
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501 Posts
Did you adjust any of the limiters in the SCT? I know this is pretty general, but some people have missed those and it'll studder like you are describing.
As stated by TKO, check injector health. Fuel pressure isn't a bad thing either to check either.
As stated by TKO, check injector health. Fuel pressure isn't a bad thing either to check either.
Ok update I did a fuel pressure test and was getting 55 psi under load. As for messing with the limiters I did adjust the speed and rev limiter if that is what you are referring to?
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Correct. Some people forget to change those and these trucks with the hotter tune will run up there in RPM if allotted. Just wanted to make sure that was covered. lol
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Yes, Map can make them do some funky things if it isn't reading manifold pressure accurately.
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Which makes sense, as fueling is dependent to a large degree on manifold pressure. So if its constantly seeing atmospheric pressure you aren't getting the uptick in fueling that normally accompanies boost.
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