High horsepower boosted cars often need large injectors. Most large
capacity injectors are available in peak and hold form - about 2 ohms
impedance, whereas most stock injectors from about 92 on are saturated
(8-10 ohms impedance). Honda engine computers require a total injector
impedance of about 10 ohms so a resistor pack is needed whenever the stock
saturated injectors are swapped with peak and hold.
Early model injected Hondas; 90-95 Prelude and Accord; 89-91 JDM B16A
Hondas all ran external resistor packs with low impedance injectors.
This wiring diagram shows the wiring for saturated (upper), and peak
and hold injectors (lower). The engine computer activates the injectors by
grounding each injector in turn.
Converting to Peak and Hold injectors
Near the brake master cylinder on OBD I cars is a connector that
distributes power to the injectors and a number of sensors. Verify with a
multimeter which wires go to the injectors. Cut all 4 and connect the
wires coming from the injectors to the resistor pack. Connect the power
wire from the resistor pack to all 4 of the unused wires coming from the
power connector. OBD II cars may have this connector somewhere under the
12V power distribution connector
Connector showing injector pins
Resistor pack in place