Killshot
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Symptom:
The handheld shows 0 RPM, and the engine will not start.
Possible Causes
- No 12V on IGN SW wire during crank
- Wrong tach input configuration
- Faulty distributor or crank trigger (not connected)
- Broken tach input wire
Solution Steps
- Confirm IGN SW wire has 12V ON + CRANK
- Verify the correct Tach Source selected
- Test distributor or crank trigger module
- Inspect the tach wiring for damage
Symptom
Handheld shows lean, AFR won’t change.
Possible Causes
- The O2 sensor is mounted incorrectly, causing damage to the sensor
- O2 sensor wiring is damaged
- Exhaust leak upstream of O2
- Failed sensor due to excess fuel, causing false lean
Solution Steps
- Confirm the O2 sensor is ≈10” from the collector
- Verify good ground and clean power, not dropping below 11.3V
- Check for exhaust leaks
- Swap/test sensor
- Correct fuel tuning
Symptom:
No fuel pump sound when keyed ON.
Possible Causes
- Relay not used (pump wired directly — ECU cannot power pump)
- Incorrect relay wiring
- No 12V to relay coil
- Pump ground fault
- Firmware issue requiring reflash
Solution Steps
- Verify if the relay is used and wired correctly
- Confirm ECU Fuel Pump Trigger output
- Check relay wiring and 12V coil supply and fuse
- Verify pump ground
Symptom
RPM shows, but no spark.
Possible Causes
- Incorrect coil wiring
- Coil type is incorrect for the system
- The coil is grounding out
- Damaged coil
- Damaged coil driver (internal of ECU)
Solution Steps
- Verify coil wiring matches the Killshot diagram
- Confirm the coil driver type is correct
- Verify the voltage to the coil
- Test with a known-good and correct coil
Symptom
The engine will not idle, or it surges badly
Possible Causes
- TPS not calibrated
- IAC wiring damage
- Excess fuel due to improper setup
- The mechanical stop screw is misadjusted
Solution Steps
- Calibrate TPS
- Verify IAC wiring
- Check for rich condition, adjust accordingly
- Reset the throttle stop screw
- Check for vacuum leaks
Symptom
The timing light does not match the handheld timing
Possible Causes
- Distributor not locked at 15° BTDC
- Wrong ignition timing setup
- Slipped harmonic balancer
- Tach source mismatch
Solution Steps
- Lock distributor at 15° BTDC
- Verify timing in handheld matches the light
- Check the balancer slip
- Confirm the correct tach source
Symptom
Engine temp rises and fans won’t trigger
Possible Causes
- No relay used (direct wiring)
- Fan control pins miswired
- Wrong temp settings
- Damaged ecu
Solution Steps
- Verify relay used (required — fans cannot run directly)
- Confirm fan pins wired per the Killshot guide
- Check fan settings
- Verify the fan wire is making a ground signal when flagged
Symptom
No data is displayed, connect timeout, or flashing issues
Possible Causes
- CAN H/L pins are swapped
- Handheld power/ground loose
- Handheld firmware mismatch
- ECU not powered properly
- Damaged CAN chip (internal HH/ECU)
Solution Steps
- Verify CAN pinout — H/L correct
- Test handheld power/ground
- Confirm firmware versions
- Recycle ECU power
Symptom
The engine stumbles off idle
Possible Causes
- Poor O2 sensor location is corrupting lean data
- TPS not calibrated
- Mechanical vacuum leak
- Wrong injector settings
- Improper tuning
Solution Steps
- Verify O2 sensor < 24” from collector
- Calibrate TPS
- Check for vac leak
- Check injector size/settings
- Refer to the fuel tuning guide for adjustments
Symptom
The engine cranks for a long time and/or is hard to start
Possible Causes
- Incorrect cranking fuel value or pressure
- Low battery voltage
- Poor engine ground
- TPS/IAC calibration off
Solution Steps
- Verify IGN SW 12V ON+CRANK
- Test battery voltage
- Increase “Fuel prime %”
- Re-cal TPS/IAC
Symptom
No screen, no power to the handheld
Possible Causes
- CAN pins swapped
- No ECU power
- Faulty handheld cable
- Broken CAN connector
- No ignition switched 12V signal to the system
Solution Steps
- Verify ECU has clean power
- Confirm the CAN pinout is correct
- Test handheld on known-good system
- Replace the known-bad cable or connector
- Find an alternate source for switched 12V, even if just for testing
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