No Voltage at Injectors?

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Old Jul 6, 2021 | 05:10 PM
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Default No Voltage at Injectors?

Hey guys, I've been trying to boost my 91 teggy with a b16. Been trying to start it and just found out I have no voltage at my injectors all of a sudden. There is also no voltage out of the resistor box, I was wondering how could I test the power into the resistor box or could it be something else? Ecu was working fine when I took it out to obd1 swap. Car did not run after swapping everything over to obd1 so I wanted to see if it would run with the stock injectors, ecu and dizzy.

Any input would be helpful.

Thanks
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Old Jul 6, 2021 | 08:23 PM
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Default Re: No Voltage at Injectors?

On the engine harness side of the resistor box plug, there are 4 red/black and 1 yellow/black wires. The yellow/black wire is the 12v power IN and the 4 red/black wires are the 12v power out to each of your fuel injectors. If the resistor box is damaged, there will be no power out on one or more of the 4 red/black wires. If you have no 12v power on the yellow/black wire, you need to find your issue there. Did you modify the original '91 Integra engine harness or plug in a different year/model engine harness ?
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Old Jul 7, 2021 | 05:58 AM
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Default Re: No Voltage at Injectors?

I would test the ECU in another car.
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Old Jul 9, 2021 | 06:41 PM
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Default Re: No Voltage at Injectors?

Originally Posted by JRCivic1
On the engine harness side of the resistor box plug, there are 4 red/black and 1 yellow/black wires. The yellow/black wire is the 12v power IN and the 4 red/black wires are the 12v power out to each of your fuel injectors. If the resistor box is damaged, there will be no power out on one or more of the 4 red/black wires. If you have no 12v power on the yellow/black wire, you need to find your issue there. Did you modify the original '91 Integra engine harness or plug in a different year/model engine harness ?
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Old Jul 13, 2021 | 12:24 PM
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Default Re: No Voltage at Injectors?

Originally Posted by JRCivic1
On the engine harness side of the resistor box plug, there are 4 red/black and 1 yellow/black wires. The yellow/black wire is the 12v power IN and the 4 red/black wires are the 12v power out to each of your fuel injectors. If the resistor box is damaged, there will be no power out on one or more of the 4 red/black wires. If you have no 12v power on the yellow/black wire, you need to find your issue there. Did you modify the original '91 Integra engine harness or plug in a different year/model engine harness ?
So I checked my connections one more time and turns out the one was loose, I now have power to the injectors but still no start. I have fuel to the rail, power to the injectors and spark... but still no start. stock injectors are in, stock ecu, havent touched the harness since the swap, and same dizzy. Would the hondata im intalling in the new obd1 ecu fix this?

Thanks for the input.
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Old Jul 13, 2021 | 11:33 PM
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Default Re: No Voltage at Injectors?

Originally Posted by justajeepguy
So I checked my connections one more time and turns out the one was loose, I now have power to the injectors but still no start. I have fuel to the rail, power to the injectors and spark... but still no start. stock injectors are in, stock ecu, havent touched the harness since the swap, and same dizzy. Would the hondata im intalling in the new obd1 ecu fix this?

Thanks for the input.
Is the resistor box stock and meant for your stock injectors? If not, What injectors were you initially trying to use here?
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Old Jul 14, 2021 | 01:58 PM
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Default Re: No Voltage at Injectors?

OP, when you say "swapped everything over to OBD-1", what parts did you change ?
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