0 step-by-step basic tuning – Holley COMMANDER 950 User Manual
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8.0 STEP-BY-STEP BASIC TUNING
The following is a step-by-step guide to perform basic tuning that will be required with all applications.
TIPS:
- Tune one parameter at a time. Don’t change things unless you know what they do.
- Follow the instructions. They provide a methodical tuning plan.
- This section is designed to help you with 75% of the tuning you need to perform. Fine tuning information is covered in
Section 9.0
.
Fine tuning is required to realize the performance that EFI will deliver.
- Until you become more familiar with the software and tuning, don’t spend a lot of time or make large changes to fix small
problems. As you tune, they may disappear as other areas are adjusted.
NOTE: It is advised that you save your map every time before you make large changes. That way if you make changes that
are incorrect, you can always revert to the previous settings. See Section 6.3 for instructions how to save a map
(saving a file to the computer).
NOTE: If your engine starts and idles, you may want to skip to Section 8.0, step 5.
8.1 Startup / Engine Won’t Start
TROUBLESHOOTING NOTE: If the engine starts and stalls, proceed to step 4.
1. CHECK RPM SIGNAL
If the engine will not start at all, first check to make sure the ECU is getting an RPM signal. To check for this, go to “Fuel”
and “Main Fuel Map”. When the engine is cranking, look in the upper left area where it says “Fuel Pump On”. These
words should be highlighted in orange. If they aren’t, then the ECU is not getting an RPM signal and will not fire the
injectors or ignition. It is likely that that the wrong ignition setting is chosen or the wrong rpm input wire is used. See the
troubleshooting section-Appendix 4 and check the wiring diagram-Appendix 10 for help. The following picture shows
what the fuel map screen should look like when the engine is cranking. Note that the “Fuel Pump On” is highlighted and
note that there will be no number in the “RPM” box until the engine actually starts.
Figure 7 Example of Engine During Cranking