Last year I put an 03 engine in my Super Duty. It runs great, but has a defueling problem. At almost exactly 2000 rpm, it falls on its face every single time. I datalogged it with HP Tuners and the problem is very obvious, but the reason is not.
I thought the problem was due to the swap, and the ECM not seeing feedback from the transmission (I'm running the Ford transmission), but I loaded in a manual trans base file and there was no change. It seems to have properly loaded because the Editor Suite in HPT has a blank box for transmission, and the Scanner Suite shows only clutch depressed yes/no.
I have the Smarty Touch turned all the way up.
In the log, you can see that the Main Injector Pulse Width at 2003rpm is 2850. At 2004 rpm it drops to 1136.
Also at 1993rpm, the desired rail pressure is just under 19k, and at 2007rpm it drops to 14k.
Also the FCA goes from 30% to 19%. 30 seems low anyway, but I could be wrong about that.
So it seems to me that there is no mechanical issue, the ECM is pulling a ton of fuel on purpose. But why?
The only discrepancy I can see is that the "Stock File" that HPT provides (because the ECM is not readable) assumes I have 3.54:1 gears while my truck has 3.73, but at the same time, the datalog vehicle speed seemed correct. And again, it ran the same with the auto trans tune and the manual trans tune.
Anybody have any ideas?
I attached 2 datalog screenshots.
I thought the problem was due to the swap, and the ECM not seeing feedback from the transmission (I'm running the Ford transmission), but I loaded in a manual trans base file and there was no change. It seems to have properly loaded because the Editor Suite in HPT has a blank box for transmission, and the Scanner Suite shows only clutch depressed yes/no.
I have the Smarty Touch turned all the way up.
In the log, you can see that the Main Injector Pulse Width at 2003rpm is 2850. At 2004 rpm it drops to 1136.
Also at 1993rpm, the desired rail pressure is just under 19k, and at 2007rpm it drops to 14k.
Also the FCA goes from 30% to 19%. 30 seems low anyway, but I could be wrong about that.
So it seems to me that there is no mechanical issue, the ECM is pulling a ton of fuel on purpose. But why?
The only discrepancy I can see is that the "Stock File" that HPT provides (because the ECM is not readable) assumes I have 3.54:1 gears while my truck has 3.73, but at the same time, the datalog vehicle speed seemed correct. And again, it ran the same with the auto trans tune and the manual trans tune.
Anybody have any ideas?
I attached 2 datalog screenshots.