Injectors

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Jan 10, 2020 | 09:38 AM

D.stecher

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Injectors

What provides the power to fire the injectors?

Jan 10, 2020 | 06:02 PM

mary-kate

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The EEC Power Relay supplies 12 volt power to the injectors, plus the computer and a few sensors. The computer grounds the injectors to fire them - in two batches of three (unless you have a '95-'96 MAF truck).

Jan 13, 2020 | 09:16 AM

D.stecher

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Thank you. Mine have power to them, but they aren't injecting. 50lb fuel pressure at the rail but not getting through the injectors.?

Jan 13, 2020 | 03:24 PM

Kramercd

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From: Caraway, AR

Quote:

Originally Posted by D.stecher

Thank you. Mine have power to them, but they aren't injecting. 50lb fuel pressure at the rail but not getting through the injectors.?

The ground for the injectors is what gets switched by the computer.

Jan 14, 2020 | 10:31 AM

D.stecher

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So, from everything I've read on these forums, its sounding like the new computer board that I installed into this truck, may actually be preprogrammed for the carbureted motor, not the efi motor. Sound plausible?

Jan 14, 2020 | 11:27 AM

Kramercd

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From: Caraway, AR

More than likely a bad ground or connector. If I remember correctly the signal comes from the distributor to the ignition module, to the computer, to the injector. So check all of your connectors coming off the distributor and follow the ground wire from the injector and inspect it back to the computer. Look for loose or corroded connectors, pinched, broken, or burned wires. Also, check the grounds coming off the battery. I'm not sure if I have a wiring diagram to narrow it down for you.