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8. Crank over engine with timing light connected, try to find out if timing is close or far from TDC. It could be far
from TDC if magnets are mounted wrong. Place a piece of masking tape on the front of the crank pulley or
flywheel to more easily see timing event and where the spark is occurring in rotation while cranking. If timing is
really wrong then check the 500 RPM Ignition setting it should be around 5 to 15 degrees and if it has been
changed to a really high value, then change it back to 10. Check the Magnet Position setting and normally on
most installations this value should be between 75 and 90, if out of range try setting around 90 and cranking
engine again. If timing is really wrong a mistake may have been made when installing magnets.
Runs smooth but no power
1. If you don’t have a knock sensor installed set KNOCK RETARD to zero and KNOCK SENSE to 1.
2. Keep the knock sensor wire away from spark plug wires.
3. Magnets positioned incorrectly, so timing is retarded too much. Check timing with a timing light (non-knob or
non-delay type). See Magnet Position window and read about this in the manual instructions.
4. RPM IGNITION values are too low.
Runs but is missing or rough:
1. Check alignment of Hall sensor over magnets. If using the slotted type hall sensor, loosen sensor mounting
bolts and try adjusting Hall sensor. Not necessary to check on CNC hall mounts.
2. Check Hall sensor air gap. Should be close to .060”. On supplied CNC hall mounts gap is not adjustable. Only
on DIY hall mounts do you need to check air gap.
3. Interference from plug wires. Make sure that all CPi2 sensor wiring and Hall sensor cable is not close to
spark plug wires or any high current/voltage wires.
4. Check spark plug gap, possibly too large. Reduce to confirm.
5. Check spark plug wire resistance, if MSD Superconductor resistance should be less than 1000 ohms for each
plug wire. Reading may vary some due to carbon based coating on the surface of the plug wire copper
conductor. Higher than 1000 ohms and the plug wire should be replaced or both crimp terminals re-crimped or
replaced. A bad plug wire will have much higher resistance than a good plug wire, and may be arcing internally,
and the spark plug wire performance will rapidly degrade over time when this occurs.
6. Check spark plug wires and cylinder numbering.
7. Check that magnets are installed to correct depth, and therefore not too distant from the hall sensor.
Coil pack breaker/fuse blows all the time:
1. Hall sensor and magnets not aligned.
2. CPi2 ground wires are not connected. Make sure ground wires are permanent and never switched in any way.
3. Single board CPi2 will have 2 ground wires. A Dual board CPi2 will have 4 ground wires.
Batt LED is lit all the time on the Programmer even while the Green LED is lit.
1. High current +12V wire on 12 pin white connector is not getting power. Remember the CPi2 needs two power
source wires to function properly. Check airframe electrical supply breaker/fuse and wiring.
I only received one magnet:
1. The magnets stick together really well. Separate them with your fingers.
Will not power off after countdown:
1. Purple wire needs dedicated switch and must disconnect from all other devices on your 12V mainbus.
2. Red high current wire may also need a dedicated switch so it gets isolated from other devices on the mainbus.
Document changes:
Apr 29, 2020. Add power switch diagram. Add Runup section in troubleshooting. Reorder wiring section.
Ver 1.6 Apr 20, 2020. B-ecu will shut off LOP if A-ecu stops functioning, whereas before LOP stayed on in B-ecu.
Ver 1.5 Mar 14, 2020. Fix no spark condition at very low cranking rpms. <60RPM.
Ver 1.4 Nov 21, 2019. Update info regarding MSD plug wire resistance.
Ver 1.4, Nov 21, 2019. New window in programmer on Single board CPi-2’s named “# of Coilpacks”.
Ver 1.4, Nov 21,2019. Window in programmer previously labeled “# COILS” has been renamed “IGN TYPE”.
Sept 19 2019. Purple power wire update, needs its own dedicated switch for proper power down.
Sept 19 2019. Add sentence stating that the Yellow kill wires are connected together.
Aug 2, 2019. Gauge Diag CP voltage reading different s/n 30 & higher.
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