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Hey guys working on my new project truck, after all my checks on the factory 302 F/I found no power at rail pump and no injector pulse. Good bit of knowledge on later model vehicles. wondering if any body has had similar faults?
What year? Is that symptom on both banks? First thing that comes to mind is the inertia switch. TPS could be out of range. Although I'm not sure that these era trucks had a flood clear mode, all the one's I've had were carbureted.
What year? Is that symptom on both banks? First thing that comes to mind is the inertia switch. TPS could be out of range. Although I'm not sure that these era trucks had a flood clear mode, all the one's I've had were carbureted.
1985 first year of EFI I believe and will double check at shop today if it is both banks. No tps sensor, and it will fire on starting fliud just no fuel making it out of injectors. Also by passed inertia switch.
86 first year efi in trucks on a 302/5.0 You don't list your year, but sometimes there were "pushed forward" vehicles in Fords's inventory as parts/build lines developed.
With EFI trucks, you turn the key to on/no crank & listen for a 1-2 second "prime" of the pumps.
When you crank, the PIP (profile ignition pickup) a Hall effect sensor in the distributor sends a signal to the computer to keep the fuel pump relay engaged & running the pump.
There should be 36-38 psi at the Schrader valve on the fuel rail.
Post your door tag. Sometimes a lot of vehicles get titled wrong.
No TPS? Why is that? These engines have a "clear flooded engine" mode. If the engine is turning less than 2000 rpm, and the tps shows a wide open throttle, it will turn off the injectors. But the pump should be running. Have you checked the pump circuit by grounding the terminal on the diagnostic plug?
Power to the injectors and the fuel pumps comes via fusible link N, as seen on pages 15 and 17.
You mentioned no pulse at the injectors. Do you have power on the supply side? As long as the EEC power relay is closed (page 60), you should have power to the red wire at each injector, regardless of whether the control module is supplying the switched ground for the injectors to fire.
If no power to the injectors, I'd work upstream from there. The EEC power relay's location is detailed on page 63, but no illustration. Sounds kinda hard to access under the dash. You'd have much better access to check for power input (same source) to the fuel pump relay, yellow wire #37. See the location on page 109, under the hood.
If no power there, look at fusible link N, as it feeds both circuits.
Sorry I have not check back in sooner. Finally made head way on project truck. After many great ideas and theories I was reminded how important ground wires are.Found damaged ground wire at ignition module harness thanks every one for the help. will keep everybody posted on updates
