biggy238
May 3rd, 2025, 05:36 AM
I'm experiencing a slow start where the engine periodically will drag the starter and run an extended period (5-8 seconds) before it achieves the specified 810rpm idle speed. I am very suspicious of the cranking main injection timing, which is still the stock federal 06 automatic timing table. If I remember correctly, it's in a different governor mode while it's doing this. According to my log, I'm running -2.54 to -2.86 main inj in the RPM range less than 810.
Engine Specs:
6.4L (destroked 6.7L)
CM849 controller (found typo and corrected)
Fleece powerflow 750 inj pump
Exergy 100% injectors
Fly cut stock 6.7L pistons
I could just pop in numbers until I have results, but I wanted to ask for input before I go that route.
I would like to post a screenshot of the log and the file, but I'm not seeing the option to do that at the moment.
The delivery fuel system should be good. I installed a low crack pressure check valve in the return circuit to help make certain the fuel circuit wasn't draining back, but it made no difference, and that has been over a year ago that it was installed.
Aside from that, you can clearly see the transition between tables when it achieves the correct idle speed.
Engine Specs:
6.4L (destroked 6.7L)
CM849 controller (found typo and corrected)
Fleece powerflow 750 inj pump
Exergy 100% injectors
Fly cut stock 6.7L pistons
I could just pop in numbers until I have results, but I wanted to ask for input before I go that route.
I would like to post a screenshot of the log and the file, but I'm not seeing the option to do that at the moment.
The delivery fuel system should be good. I installed a low crack pressure check valve in the return circuit to help make certain the fuel circuit wasn't draining back, but it made no difference, and that has been over a year ago that it was installed.
Aside from that, you can clearly see the transition between tables when it achieves the correct idle speed.