The Peak current quickly opens the injector while the lower Hold current rating is used to keep it open for the duration of the ECU command. The peak and hold circuit opens the injector with a high current (Peak) pulse and then switches the current down to hold the injector open. Peak and hold injectors are low impedance (0,5-5 ohms) and use a peak and hold driver to activate them. These types of injectors and drivers may also be called current sensing or current limiting. Principle of operation of the peak and hold injector For the duration of 1 pulse width, that current is slightly reduced and held (the hold part). When the ECU calls for fuel to be injected, it sends out voltage via the wire clips until a certain current level is reached (the peak part) (varies by injector size, company). Because they are more expensive and complex than saturated circuit drivers, they are not generally used with domestic production ECUs. ![]() Peak/hold injectors are low impedance injectors and are usually used in aftermarket high performance systems. By adding the fuel to the air sucked in by the engine, a mixture is created with the required fuel/air ratio. Injectors are electrically operated valves which accurately control the quantity of fuel delivered.
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