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Electronics Need help wiring something up? Thinking of adding an electrical component to your car? Need help troubleshooting that wiring glitch?

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Old 02-21-2009, 04:39 PM   #1
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Car: 88' Trans-AM WS6
Engine: 305 TPI
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Fuel injectors firing
Could someone explain how the fuel injectors are fired?
Apparently there are only 2 wires coming from my ecu D15 and D16 which switch to ground firing 4 cylinders each time.
the other wire is connected to 12v all the time.

Is this correct?
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Old 02-22-2009, 11:21 AM   #2
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Car: '91 Z28 convertible
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Transmission: T5
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Re: Fuel injectors firing
The injectors have power through fuses and are grounded by the ECM, all 8 at once (it's called "batch fire"). They are fired on EVERY revolution, so twice per firing cycle.

Hope this helps.
Lou
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Old 02-22-2009, 11:29 AM   #3
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Car: 88' Trans-AM WS6
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Re: Fuel injectors firing
yeah, I think I got it. Im trying to read the rpm's and Im reading the pulses just might have to adjust the multiplier.
1000 pulses/min should be 1000 rpm
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Old 02-22-2009, 11:29 AM
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Reload this Page Fuel injectors firing
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