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Troubleshooting Tips

Reference: Troubleshooting Tips

Our ECU runs differently than the OEM ECU. Sometimes issues on the machine will show up with our ECU, while the OEM seems to operate fine.

Below is a list of common issues, and how to resolve them so that you can get your machine back into peak operating condition.

Common Issues and Solutions

Issue	Potential Cause	Solution
Cranks excessively, and only occasionally fires.	Battery weak.	The Copperhead requires at least 11 Volts to fire the sparkplug, and has a higher current draw than stock. Battery voltage when the engine is running should be 12-15 Volts. If it is below/above that, it indicates a bad battery or faulty voltage regulator. Typically issue is only present on cold starts. Try starting with a trickle charger connected to confirm.
Hard starting, random stalls.	Spark plug worn/fouled.	Replace spark plug.
Hard starting, stalling when coming off throttle, or poor performance.	Throttle position sensor (TPS) not centered properly.	Center TPS as per service manual.
Hard starting, stalling when coming off throttle, or poor performance.	Low fuel pressure.	ECU requires 42-43PSI at the fuel injector when the engine is running for proper operation.
Engine requires a lot of throttle to keep running.	Manifold Air Pressure (MAP) sensor hose kinked on crimped.	The MAP sensor is a ~1" black plastic cube that measures air pressure. If the 1/8" black vacuum line connected to it is kinked or crimped, the reading is improper. Unkink hose.
Repetitive start/stalls when cranking	Defective Voltage Regulator.	Unplug regulator to confirm that ATV starts fine.
Cranks but kicks back repeatably.	Valve lash set incorrectly.	Adjust valve lash as per ATV user manual.

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