Holley pro-jection 2D - Page 25

25
Electrical Connections Section 12.0
D
Injector flows fuel
wi
th ignition switch
in the “RUN” position
and engine not
running
- Poor Engine ground wire connection
- Leaky fuel injector
- Clean ground location and tighten
connection
- Replace fuel injector
E
“CLEAR FLOOD”
mode does not
operate while
cranking the engine
- Throttle does not open fully
- Faulty TPS
- Low voltage to ECU during cranking
- ECU does not supply 5 volt signal to TPS
- Check for interference between the throttle
linkage and surrounding components.
Adjust throttle linkage.
- Test TPS. See Testing the TPS section.
Replace TPS
- Ensure that voltage to ECU is above 8 volts
during cranking. Replace battery or starter
- Check all wire connections. Replace ECU
F
Engine Runs Rich - ECU adjustment knobs are set too high
- High supply fuel pressure
- High return fuel pressure
- Incorrect TPS adjustment
- Faulty TPS
- Oxygen sensor is mounted incorrectly
- Faulty oxygen sensor
- Leaking fuel injector
- Adjust knob settings. See Tuning section on
Page 22
- Install pressure gauges and adjust fuel
pressure. See Adjusting fuel pressure
section.
- Kinked or restricted fuel return line. Repair
kinks and remove obstructions from fuel
line.
- Adjust TPS position. See Adjusting the TPS
section on Page 21
- Test TPS. See Testing the TPS section.
Replace TPS
- See Optional Closed Loop System
installation section on Page 14
- Replace the oxygen sensor
- Replace fuel injector
G
Engine Runs Lean - ECU adjustment knobs are set too low
- Low supply fuel pressure
- Incorrect TPS adjustment
- Faulty TPS
- Restricted Fuel Injector
- Vacuum Leak
- Water in fuel
- Faulty oxygen sensor
- Adjust knob settings. See Tuning section on
Page 22
- Install pressure gauges and adjust fuel
pressure. See Adjusting Fuel Pressure
section.
- Adjust TPS position. See Adjusting the TPS
section on Page 21
- Test TPS. See Testing the TPS section.
Replace TPS
- Remove fuel injector and clean injector
screen and throttle body. Replace injector
- Locate vacuum leak and repair
- Remove water from fuel with proper fuel
additive.
- Replace the oxygen sensor
H
Hard Starting (Cold
Engine)
- “CHOKE” knob adjustment set too low
- Non-functional coolant temperature
sensor
- Non-functional fast idle solenoid
- Fuel pump not flowing fuel
- Increase “CHOKE” setting
- Test temperature sensor. See Testing the
Temperature Sensor section. Replace
sensor if necessary.
- Check wire connection to solenoid
- Test solenoid. See Testing the Fast Idle
Solenoid section. Replace solenoid if
necessary.
- See Item A
I
Hard Starting (Warm
Engine)
- Engine is flooding
- Non-functional coolant temperature
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
Temperature 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 - Check voltage to pump from ECU. Inspect