OK, the question has to do with the multi-port fuel injection system in my '85 toyota camry. (this is the car that exhibits a peculiar stall-under-load effect, highly intermittent)
Looking thru the factory manual, it's clear that all four injectors fire at the *same* time. The EFI unit has two output wires, which are tied together. That single line goes two four ballast resistors, and the other end of each ballast resistor goes to an injector. The other end of the injector coil goes to B+, so when the lines on the EFI unit pull low, current flows and the injector fires.
So what has me stumped (and here this is a purely academic exercise) is how does the fuel injection work if the injectors all fire at the same damn time? The manual has a one line blurb that says (paraphrase) 'the EFI computer decides how much fuel is required for the given sensor inputs, and injects one-half of that amount per crankshaft revolution.'
Which makes sense because it is a four cycle motor.
But for my thinking, only one of those injectors is going to fire at the 'right' time, or when the intake valve is just starting to open up. What happens to the other three when the injector fires at some random time - does the cloud of fuel mist just sort of hang out in the intake runner until it's needed?
All comments gratefully accepted.
Jim
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