Technical Support

Installing wiring harness near high voltage components

The wiring harness must not be installed near the spark plugs, ignition coil, distributor or any high voltage component. These components can cause voltage disturbances to the eFlexFuel control unit. Worn components can cause disruption more often than than new ones.

This issue also applies to other retrofit electronics in the engine compartment.


  • Engine stumbles while driving
  • eFlexFuel App shows multiple fault codes
  • Ignition interruptions in cylinders

How to repair

  • Move the wiring harness away from high voltage components
  • Move the ethanol sensor, the ground wire or the temperature sensor's wire further away
  • Re-locate the control unit