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Knob indicates the mixture knob position, +/- 50%. 0% (no correction) is with the witness mark straight
up at the 12 o’clock position.
AP indicates the acceleration pump feature, which adds extra fuel as the throttle opens. AP should read
zero when the throttle is steady. The AP number should increase above zero as the throttle is opened
quickly. If AP reads a value higher than zero when the throttle is stable, the throttle position sensor may
be faulty.
Duty Cycle (DUTY) refers to the amount of time that the injector remains open in relation to how much
time is available at that rpm before the next injection cycle begins. If the engine is missing or running
rough check DUTY for unstable readings. This may indicate a bad sensor or wiring issue.
The maximum continuous duty cycle should never exceed 85%.
Ignition (IGN) F Models Only (Fuel only models will not display ignition parameters)
A positive sign indicates that the ignition timing is after TDC. If timing is after TDC, ignition programming
could be wrong. Having ignition timing after TDC will cause major loss of power.
IGN
If you need to get to gauge2 from any parameter you can do the following. Push GAUGE, then the
> button to get to gauge2, then the < button back to gauge1, then push GAUGE button to return
to the previous parameter.
Gauge 3 Mode
Gauge 3 mode is accessed by pressing (>) once, when in Gauge 2 mode.
The top line displays battery voltage and throttle position (TP). Second line displays the A/F ratio and
barometric pressure. An optional setup allows another temperature sensor input to be displayed with the
Baro readout. These alternate every 2 seconds.
Gauge 3 mode
Gauge 4 mode
Gauge 4 mode is accessed by pressing (>) once, when in Gauge 3 mode.
This gauge mode displays the most popular engine information on one screen. Manifold pressure, RPM,
AFR (O2)and ignition timing
Gauge 4 mode
Gauge 5 mode is accessed from Gauge 4 mode by pressing (>) once, when in Gauge 4 mode
This screen displays O2 AFR, Target AFR, Mixture Knob % and Closed Loop fuel trim %
END OF GAUGE MODE SECTION
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