i believe he is talking about the poppets in the injectors. this is the problem i believe mine was having b/c it would miss with constant pedal pressure(holding it around 10-15psi of boost like your "sweet spot") then it got worse and worse after about 6 months and eventually got to the point that it would do it when i floored it too. like bad like it would run good in 2nd then in 3rd the next thing you know all you hear is popping from the exhaust, its jerking back and forth, and acting like there is NO oil in the HPOP, but that was all good. i changed the ICP, IPR, CPS, CPR fuel filters, oil/filter all trying to chase down this problem and changed the injectors for the hell of it one sunday to these stage 2's that my buddy had laying around and low and behold. it runs NORMAL!! haha. i was also about to change the heads b/c when i would start it in the mornings it would miss a little until i reved it up a little bit
the poppets can allow HPO to pass through therefore not pressurizing the fuel in the injector. if the poppets are the problem i believe Jim said its better to get a completely different set of injectors b/c while the poppets CAN be fixed its more expensive to fix the poppets than to buy a $50 core injector
Neal, does that all make sense?
Only thing is it would pass oil all the time at a certain psi, not whether or not you're towing.
And I still think your 17* pump is plenty for your injectors, with proper tuning it should supply enough without issue.
My 17* pump will hold my 238cc Hybrids at 3000 psi all I want, foot to the floor.
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'96 F-350 Reg Cab 4x4 PSD
'97 F-350 CC Short Bed 4x4 PSD
Yup. Jim that does pretty much make sense. Sounds like I need to get that truck some AE time.
If I do have a bad poppet is there a way to figure which injector?
You also have mentioned proper tuning. What in particular can they do to get the tuning correct? Is it timing or what?
I was very recently live tuned and I am still not sure if it was worth it or that anything special was done. The biggest difference in my TW and the live DP was the DP did not smoke as bad when regular driving.
Should I continue on with my search for the perfect timing? I still have one more place I would like to try. But I don't have the funds for it yet.
no problem Jim!!! i'm happy i actually remembered that!! LoL.
strangely enough when mine was doing this i didn't do it all the time under full throttle. it did always do it in tow program then it progressively got to the point it would miss in almost all the programs then did it at full throttle everytime i got on it for like 2 weeks then stopped missing at WOT then i changed them to larger ones.. i will just say oil was NOT my problem. LoL. Neal you only got 20cc more fuel than me and the same nozzles, but i'm not tuned for them yet, however, i don't think the HPOP is your problem
Yes I can throw a CEL. Only when I am getting on a ramp at a speed/acceleration that is more than usual. I guess I mean that if I get on it pretty hard it will throw it real easy towing.
I can do it empty with extreme acceleration up a steep hill or similiar.
I can also do it real easy if I try to build boost as if I were on a dyno. Running in 4th gear at about 30-40 mph and ease on the brake while easing on the accelerator a bit more. More brake, more fuel, build boost, build boost then WHAM! Floor it and release the brake.
*bling* *bling* CEL !
I was able to do some data logging yesterday. And yes I nailed it, mainly in 4th gear so I could let it wind up good. I ran it to about 3000 rpm and the pressure started off good, went to just above 3000psi and flat lined. Then the duty cycle started climbing up high. Once the %DC climbed real high the pressure dropped off some, as expected. The duty cycle climbed to 85% and flatlined while te pressure fluctuated trying to maintain. YES I said 85%
Then I let off it and the duty cycle dropped and the pressure jumped a bit back to where it should be.
I did record this so I have proof that I am not crazy or lying. If anybody want it I can e-mail it. It shows two times this cycle, I floored it twice in this recording.
The truck runs great, like a raped ape. No problems or symptoms. This is the way it has already ran. I did this test in my 100 hp setting,my daily driver setting.
Do you guys think it is the injector still? If so it has always ran this way. Also is there a way to isolate the injector.
neal, i never doubted you, i am just saying that on stock programing the duty cycle cant go over 54%. the custom chips i'm sure overide that as they have to be able to supply more oil somehow. everything you just described is a classic overtaxed oil pump..
I know you believed me. I just didn't have proof other than me looking across the cab in the truck. I have now built me a platform for the laptop so I don't have to dump the new Dell in the floor anymore.
That is good to hear Joe. I thought you guys were saying that NO programming got over 55% or so. I was hoping I did not have a bad injector. They are just a little over a year old now and I have more faith than that in Jim's sticks. Although I did send him a pretty junky set. LOL
I am curious what Jim thinks on this since he suggests that a stock 17 pump will hold these sticks just fine. Maybe my pump is a bit weak but it shouldn't be. It is a remanned Ford pump with 55,000 miles on it now.
I am asking Jody what he puts in the programming as far as this is concerned. Also I have already been talking with Joey at Terminator, Muuuuuhahaha!
cct is a great tool, only problem is the oil must be warmed to 170 minimum. i would like to be able to run the tests when the oil is still cold as i have had plenty of trucks with injector issues but only when the truck is cold, it then progressed over time until it finally acts up warm. the joy of the 6.0 is you could actually run a power balance test as well to visibly see each cylinder, unfortunatly we cant do that on a 7.3.
i'm sure the tunes are allowing the duty cycle to go that high, its not possible on stock tunes...... i would be curious to see what the readings look like if you remove the chips all together and rerun your same test scenario. i would bet you would sit at the max of 54 percent.
the only thin gi can think of injector related is what was covered before being the injector leaking off oil but again, i think it would reun poorly.
I do have a stock settig that I NEVER use . LOL
But it is slightly modified but still stock. I will try that.
If that does not work I will unplug the chip just to see, Then again will that work since I will have stage II's with stock programming? Just a thought. Nevertheless I will start some of those tests tomorrow.
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