45
3. Do resistance check of ignition wires. Possible bad crimp at end of wire.
4. Spark plug wires causing EMI(interference). Try different brand of wires. Must use Suppression type plug
wires with SDS.
5. Check for loose spark plug wires.
6. Move sensor wires away from ignition.
7. Don’t ground solenoids or other devices at the same place as the EM-5 ground.
8. Move EM-5 further away from engine.
9. Solenoid switching may cause this. Disable any solenoids, relays, motors etc. Diodes can be connected
across solenoids to absorb electrical spikes. Call us for help.
Strange characters or black bar across the top of the LCD window:
1. Programmer cable damaged, common problem. New cable can be found at most computer stores.
2. Measure the resistance of all spark plug wires. Possible poor crimp at the end of a wire causing arcing, or
bad insulation causing arcing to ground. Replace or repair any wire that has a much higher resistance than
the others.
3. Interference from spark plug wires. Try different brand of plug wires. Must use Suppression type plug
wires with SDS.
4. Programmer data being interfered with. Don’t run cable with other wiring.
5. Loose programmer cable connection.
6. Change spark plugs to resistor type. Non-resistor type cause electrical noise.
7. Programmer was plugged into EM-5 after the EM-5 was powered up.
8. Move ground connection to EM-5 to a different location.
9. Check main harness connection to EM-5.
Engine fills up with fuel:
1. Bad EM-5 ground wire connection on DB25 main harness. Move ground to another place or clean
connection.
2. Check for leaking fuel pressure regulator diaphragm.
Won’t run over 2000 rpm:
1. Check FUELCUT BELOW TP limit. Set to a lower value, or set to NO CUT.
If problems persist, and you are calling for help, we may be able to help you better if you write down
your values and send them to us. This may help narrow down the problem much faster. The last page in
this manual is for writing down your values.
Don’t ground the SDS EM-5 to the engine. Engine ground may be noisy and cause the EM-5 to
malfunction. Ground it to the chassis of the aircraft or to a grounding buss. Be sure to sand off any
paint where the connection is.
Make sure the EM-5 is permanently grounded to the airframe and never put a switch in any ground
circuit of any SDS component. If a component needs a switch, it should always be on the positive(+)
wire.
Spark plug wires, and Interference Problems
Always use radio suppression type spark plug wires. NEVER use solid core wires.
Recommended wires:
MSD superconductor.
NGK.
OEM or factory carbon string.
Accel 8.8 yellow.
For engines with coil-on-plug ignition coils be sure to use resistor type spark plugs. Resistor plugs
usually have 5Kohms resistance. NGK resistor plugs will have the letter R in the part number.
Non resistor plugs can create electrical noise and cause interference problems.
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