14
- Vacuum Leak
- Water in fuel
- Faulty oxygen sensor
body. Replace injector.
- Locate vacuum leak and repair.
- Remove water from fuel with proper fueladditive.
- Replace the oxygen sensor.
H
Hard Starting (Cold Engine)
- “CHOKE” knob adj. set too low
- Non-functional coolant temp.
sensor
- Non-functional fast idle solenoid
- Fuel pump not flowing fuel
- Increase “CHOKE” setting
- Test temperature sensor. See Testing the Temp.
Sensor section. Replace sensor, if necessary.
- Check wire connection to solenoid.
- Test solenoid. See Testing the Fast Idle Sol. Section.
Replace solenoid, if necessary.
- See Item A
I
Hard Starting (Warm
Engine)
- Engine is flooding
- Non-functional coolant temp.
sensor.
- Fuel pump not flowing fuel
- Use “CLEAR FLOOD” mode. Inspect injectors after
shutting off engine for injector leakage. Replace
leaking injectors.
- Test temperature sensor. See Testing the Temp.
Sensor section. Replace sensor, if necessary.
- See Item A
J
Fuse blows repeatedly
- Improper fuse installed
- Fuel pump motor is locked
- Wire insulation is broken resulting
in a short to ground
- Faulty ECU
- Install 10 Amp Fuse
- Test Fuel Pump. See Item A
- Inspect wiring harness and repair wire
- Replace ECU
K
Low Fuel Pressure
- Low Voltage at fuel pump
- Kinked or restricted fuel line
- Faulty fuel pump
- Throttle body pressure regulator
improperly adjusted
- Low fuel level in tank
- Restrictive screen in tank
- Check voltage to pump from ECU. Inspect wiring
harness. Check battery volts.
- Repair kinks and remove obstructions from fuel line.
- See Item A
- See Adjusting Fuel Pressure section
- Add fuel to tank
- Clean fuel tank and increase screen size
L
High Fuel Pressure
- Kinked or restricted fuel return line
- Return line diameter too small
- Throttle body pressure regulator
improperly adjusted
- Repair kinks and remove obstructions from fuel line.
- Replace fuel return line with larger dia. fuel line.
- See Adjusting Fuel Pressure section
ADJUSTING THE FUEL PRESSURE:
The pressure regulator located at the rear of the throttle body is factory set at 15 PSI. A slight adjustment may be necessary to allow for
proper system operation.
1. Install a pressure gauge into the fuel supply line. This gauge must be removed after the fuel pressure has been properly adjusted.
2. Start the engine and verify that the fuel lines do not leak. If any leaks are found, turn off the engine and repair the leaks before
continuing.
3. Insert a 5/32” Allen wrench into the pressure regulator screw on the top of the throttle body.
