Cartwaveforms > actuators > injector > Fuel Injector (Single Point)
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Fuel Injector (Single Point) Waveform Notes
Single Point Injector (SPI) is also sometimes referred to as Throttle Body Injection (TBI).
A single injector is used (on larger engines two injectors can be used) in what may have the outward appearance to be a carburettor housing.
The resultant waveform from the SPI system will show an initial injection period followed by multi-pulsing of the injector in the remainder of the trace. This section of the waveform is called the supplementary duration and is the only part of the injection trace to expand.
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