Holley pro-jection 2D User Manual (English)

Other manuals for Holley pro-jection 2D

Installation, Tuning, & Troubleshooting Manual16 pages

Questions and Answers:

M
Maria MartinAug 17, 2025
What to do if Holley pro-jection 2D fuel pump does not operate?
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  Matthew SmithAug 17, 2025
  If the fuel pump does not operate, several issues could be the cause. First, replace the fuse if it's open or blown. Then, ensure the ground connection is clean and tight. Check all connectors for looseness. Replace or repair any broken or burned wires. If there's no power to the pump from the ECU, check for voltage and ground at the pump, and replace the ECU if proper voltage is present. Also, verify power output from the relay to the ECU, test the relay, and replace it if needed. Finally, consider replacing the fuel pump if it's faulty.
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Katherine ArnoldAug 20, 2025
Why does my Holley pro-jection 2D run rich?
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  David AdamsAug 20, 2025
  If your Holley Engine runs rich, several factors could be responsible. Start by adjusting the ECU knobs to the correct settings. High fuel pressure could be the cause, so install pressure gauges and adjust fuel pressure accordingly. Inspect the fuel return line for kinks or restrictions; repair or remove any obstructions. Ensure the TPS is correctly adjusted. If the issue persists, test and potentially replace the TPS. Also, check the oxygen sensor installation and condition, replacing it if necessary. Finally, a leaking fuel injector can cause a rich condition, so consider replacing it.
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Eric NormanAug 22, 2025
What causes a Holley Engine to run lean?
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  Peter RomeroAug 22, 2025
  If your Holley Engine runs lean, it could be due to several reasons. First, check if the ECU adjustment knobs are set too low and adjust them accordingly. Low fuel supply pressure can also cause a lean condition; install pressure gauges and adjust the fuel pressure. Ensure that the TPS is correctly adjusted. If the problem continues, test and replace the TPS if it's faulty. Other potential causes include restricted fuel injectors, which may require cleaning or replacement, vacuum leaks that need to be located and repaired, water in the fuel, which can be resolved with a fuel additive, and a faulty oxygen sensor, which should be replaced.
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Philip JacksonAug 25, 2025
What to do if Holley pro-jection 2D has no fuel from the injectors?
- S
  Stephanie MeyerAug 26, 2025
  If there is no fuel from the injectors, start by checking and replacing any open or blown fuses. Ensure there's a good ground connection by cleaning the ground location and tightening the connection. Check the power to the ECU by testing the relay and replacing it if faulty. Inspect and clean the injector harness connection, then reconnect it. Make sure there is fuel in the tank. Install pressure gauges and adjust fuel pressure if it's low. Repair any kinks or obstructions in the fuel line. Also, check for proper wire connection. Finally, replace the ECU if it's faulty.
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Patricia DavisAug 28, 2025
Why is my Holley Engine hard starting when warm?
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  Laura KimAug 28, 2025
  A warm Holley Engine that's hard to start may be flooding. Use the “CLEAR FLOOD” mode and inspect the injectors for leakage after shutting off the engine; replace any leaking injectors. Also, test the coolant temperature sensor and replace it if necessary. See Item A if the fuel pump is not flowing fuel.
A
Andrea LaneAug 30, 2025
Why is my Holley Engine hard starting when cold?
- D
  David WilsonAug 30, 2025
  If your Holley Engine is hard to start when cold, first increase the “CHOKE” setting. Test the temperature sensor and replace it if necessary. Check the wire connection to the fast idle solenoid. See Item A if the fuel pump is not flowing fuel.
B
Benjamin GreeneSep 2, 2025
What causes low fuel pressure in Holley pro-jection 2D?
- K
  Kimberly WangSep 2, 2025
  Low fuel pressure in a Holley Engine can stem from several issues. Begin by checking the voltage to the pump from the ECU, inspecting the wiring harness, and checking the battery voltage. Repair any kinks or remove obstructions from the fuel line. See Item A if the fuel pump is faulty. Also, refer to the Adjusting Fuel Pressure section if the throttle body pressure regulator is improperly adjusted. Ensure there's sufficient fuel in the tank. Finally, clean the fuel tank and increase the screen size if there's a restrictive screen in the tank.
D
Daniel FordSep 5, 2025
What causes high fuel pressure in Holley Engine?
- K
  Kayla CarrSep 5, 2025
  High fuel pressure in a Holley Engine can be caused by a kinked or restricted fuel return line, so repair any kinks and remove obstructions. If the return line diameter is too small, replace it with a larger diameter fuel line. Also, the throttle body pressure regulator may be improperly adjusted; refer to the Adjusting Fuel Pressure section.
A
adamsleahSep 7, 2025
What to do if Holley pro-jection 2D Engine fuse blows repeatedly?
- M
  Michael WebbSep 7, 2025
  If the Holley Engine fuse blows repeatedly, ensure a 10 Amp Fuse is installed. Test the fuel pump. Inspect the wiring harness and repair any broken wire insulation causing a short to ground. If problems persist, replace the ECU.
J
Jordan MillerSep 12, 2025
What to do if Holley pro-jection 2D 'CLEAR FLOOD' mode does not operate?
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  michaellawsonSep 12, 2025
  If the “CLEAR FLOOD” mode does not operate while cranking the engine, check for interference between the throttle linkage and surrounding components and adjust the throttle linkage. Test the TPS and replace it if faulty. Ensure that the voltage to the ECU is above 8 volts during cranking; replace the battery or starter if necessary. Check all wire connections and replace the ECU if it does not supply a 5-volt signal to the TPS.

Holley pro-jection 2D Specifications

General

Product Line	Pro-Jection
ECU	Included
Fuel	Gasoline
Type	Throttle Body Injection
Application	Universal
Model	2D
Manufacturer	Holley
Compatibility	Universal
Fuel Delivery	TBI