No power to injectors on 90' 7.4L...HELP PLEASE! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

baclay9 · 07-09-2011, 09:40 AM

Just picked up a 1990 1 ton with a TBI 454. It wasn't running when I got it. I changed the filter and fuel pump.

The engine will run like a champ if I spray starting fluid down the throttle body.

I am getting no power to the injectors on the throttle body. There is no constant power on the hot side and no intermittent ground on the signal side. The injectors will spray if i jump them with a wire so I know they are good. I am just getting no power to the wires.

Can someone please give me a clue on where to look for a problem I have checked the wiring out and it all looks good but I am not sure which connector under the dash goes to the Throttle body.

07-09-2011, 09:40 AM	#1
baclay9 Registered User Join Date: Apr 2010 Location: Newcastle, OK Posts: 1,344	No power to injectors on 90' 7.4L...HELP PLEASE! Just picked up a 1990 1 ton with a TBI 454. It wasn't running when I got it. I changed the filter and fuel pump. The engine will run like a champ if I spray starting fluid down the throttle body. I am getting no power to the injectors on the throttle body. There is no constant power on the hot side and no intermittent ground on the signal side. The injectors will spray if i jump them with a wire so I know they are good. I am just getting no power to the wires. Can someone please give me a clue on where to look for a problem I have checked the wiring out and it all looks good but I am not sure which connector under the dash goes to the Throttle body.



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