Fuel Injector Pulser

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NOTE: Part are available from Jameco, Mouser & Digi-Key, with part numbers and details of construction available inside our publication (book & DVD) for this series.

Injector pulsers are a main staple component in the arsenal of a modern automotive technician, D I Y aficionado or enthusiasts, who needs to perform diagnostics on fuel injectors. The uses for a fuel injector pulses are varied. It is used to pulse and measure the electrical characteristics and general health of an injector, to determine if the injector is clogged, by doing a fuel flow test, and for to fast pulse and clean the injector using special solvents. In essence, this device is what you'll find inside the ECM, with the exception that the LM555 timer chip is substituted by the ECM processor.

As with many of our other gadgets, this circuit can be built into an inexpensive universal PC board. The LM555 timer is a popular oscillator chip that creates the pulse signal. It is a 25 cent component. This entire circuit can be built for less than 4 dollars. An LM 393, or Dual Differential Comparator chip is also used to create the duty cycle part of the signal. The other components are off the shelf resistors, potentiometers and small capacitors readily available anywhere.

This circuit works as follows.

This device uses a built in pulse width modulated signal generator circuit for triggering a power MOSFET, which is a high current transistor. This particular transistor, the IRF740 is rated up to 400V and can switch around 10 Amps which ...

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