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There are 16 contrast levels available, from 0 to 15. This feature can help optimize viewing at different
viewing angles and also during temperature extremes. High temperature can affect the contrast so an
adjustment may be needed to compensate. Use the +1/-1 buttons to increment or decrement the
setting.
Idle
Best to adjust RPM FUEL values first to get the best idle mixture. For the most stable idle you will
need a rich mixture. If you have a wideband meter, a good target mixture for idle is 12 to 13. Don’t
adjust fuel numbers because the engine is idling too fast. If the engine is idling too fast, adjust the
airflow on the throttle plate assembly, then recheck and adjust the RPM FUEL ranges where the
engine is idling. Usually keeping RPM FUEL numbers from 500 through 1200 equal is also a good
idea. This will help keep the idle from surging up and down.
If idle still seems a bit unstable, then you may need to also adjust a few MANIFOLD PRESSURE
values to improve smoothness. To do this, press the Gauge button to see gauge1 mode, note the MP
reading on the top left. Then scroll left and into the manifold pressure values, just above and below
where the engine is idling at, and make the values all equal. We have done this by default around 10”
vacuum, but some adjustment might be needed. If the MP fluctuates over more than 3 ranges, you
may have to install a .025 to .035 inch orifice in the MAP sensor line to help average and stabilize the
vacuum seen by the SDS computer.
Acceleration Pump (ACC Pump)
You must have a TPS installed to have this function active. ACC PUMP values help give smooth
throttle response when the throttle is opened quickly. There are three adjustments to make for the
acceleration pump. Adjustment should be done when the engine is at normal operating temperature.
ACCS.JPG ACCL.JPG
ACCH.JPG
The ACCPUMP LO RPM value controls action from 0 to 1800 rpm. With the engine idling, quickly
open the throttle. If the engine hesitates, change the value. If the hesitation is worse, you have
changed the value the wrong way. Find the value that gives the best quick throttle response.
Next is to adjust the ACC PUMP SENSE. This is very important just out of the idle range. Set this
control by opening the throttle slowly from the idle position. Adjust for the smoothest acceleration. 1 is
least sensitive, 8 is most sensitive.
The ACCPUMP HI RPM setting controls action above 1800 rpm Snap the throttle open quickly above
1800 rpm. If the engine hesitates, change the value. If the hesitation is worse, you have changed the
value the wrong way. Repeat this procedure until engine response is acceptable.
Acc pump values are generally between 5 and 50 on most applications. The ACCPUMP LO RPM is
usually a higher value than ACCPUMP HI RPM.
Engine Temperature (ENGINE TEMP, ET)
There are 32 ranges under this parameter which determine the amount of extra fuel injected to
compensate for a cold engine during warmup. Liquid cooled engines use a water temp sensor and air
cooled engines use a cylinder head temp sensor to supply a signal to the EM-5. The function of this
parameter is similar to a choke on a carburetor.
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