Impedance is the electrical resistance of the electromagnetic coil inside of a fuel injector

Impedance is measured in ohms by an ohmmeter. Injectors can be classified in two categories, as either high-impedance or low-impedance. High-impedance injectors typically range from 12 to 16 ohms of impedance, while low-impedance injectors usually range from 0.7 to 5 ohms.

High Impedance: The most common, using a simple drive circuitry is sometimes referred to as a saturated driver circuit. The injectors them selfs are also refered to a saturated injectors.

Low Impedance: Normally having a coil resistance of 5 ohms or less, this type is typically found in larger sized or high performance injectors. The driver circuitry for these types are called “Peak-Hold” and is more complex costing more than the saturated injectors. Low-impedance injectors are generally preferred for racing or ultra-high performance use because they respond more quickly, but aftermarket engine controllers are usually required to control them.


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  • Starting issues
  • Poor idle
  • Failed emissions
  • Poor Performance
  • Engine does not reach full RPM

Then you may benefit from ProFlow’s Ultrasonic Fuel Injector Cleaning Service.

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