6
11.
It’s time to check the timing. Remove the fuel pump relay. This will ensure that no fuel will be sprayed from the
injectors. Crank the engine over and check the timing with a timing light.
12. To make sure the ECU is getting an RPM signal, look at the
“RPM” on the Initial Startup screen of the Sniper EFI
handheld. Crank the engine over and make sure it shows RPM (
Figure 12
). To locate this screen, from the HOME
SCREEN of the handheld, select the MONITOR icon, then select the “Monitors” screen. Here you should see an icon
named “Initial Startup”. Select this icon.
Engine RPM
– This gauge should show “Stall!”, once you begin cranking the engine it will show actual engine RPM.
Figure 12
13. Next, check the timing with a timing light, it should be whatever the cranking timing is programmed to in the software
(Sniper EFI Systems use 15 degrees as the default cranking timing value). Shoot the balance with the timing light, it
should read 15 degrees on the balancer. If not, it may be necessary to loosen the distributor hold down bracket and
slightly advance or retard the ignition timing by rotating the distributor housing to make these values match. Once this
value has been met, re-tighten the distributor hold down bracket.
14. Reinstall the fuel pump relay.
15. Start the engine.
16. Once running, check the timing with a timing light and make sure it matches the commanded timing of the ECU. It is
helpful to use the “Enable Static Timing Set” feature in the handheld, this feature can lock the timing to a single value.
To find the Static Timing Menu, from the HOME SCREEN, select TUNING, then select SYSTEM. Static Timing will be
the Bottom Right icon of this screen
(Figure 13).
Move the sliding bar to 15 Degrees, then press the SET Icon, this
will command the engine to run at 15 Degrees of Ignition Timing.
System Menu, Select Static Timing
Slide the pointer to 15, Press Set
Figure 13
17. Once synced, CAREFULLY rev the engine up to 3000-4000 RPM and make sure the timing still matches. If it is
advanced, lower the Inductive Delay value by about 20. If it is retarded, raise the Inductive Delay value about 20.
Cycle the ignition power after making this change.
