1990 Ford F150 5.0 XLT. Sometime will start and run great. Go back the next day and it will turn over put won't hit. It is getting spark to the plugs. When i attempt to detach the air intake hose and spray starting fluid, it still wont hit. You can hear the fuel pump kick in. I thought sure by spraying starting fluid it would at least try to start. Any Ideas?
We are having similar problems. My husband replaced the fuel pump, fuel regulator and now it cranks but dies when you give it a lot of gas. He thinks the fuel injectors are stopped up. I read where one guy replaced the computer and fixed it and another one replaced the EEC. Check the relay contact and clean and check all grounding wires.
The heart of the fuel/ignition system is the EEC. Other components involved are the fuel and EEC relays. You could have corroded cables causing the intermittent problem. I'd start with the relays. Remove the connector cables and spray clean the connections. If no resolution try turning the ignition switch on and off while another person feels the relays to see if they are operating (also can listen for a clicking sound from them). If all come up OK then remove the TFI connector on the distributer and clean it too. Reconnect it. A voltmeter or 12 volt circuit tester would also help by probing the various 12 volt points at the relays etc but you will need a circuit diagram to find these points as well as know how to read them. The whole point is to eliminate the least costly components first. The EEC is the most expensive component. That's why I would not replace it until I was sure it wasn't something else. Shotgunning the problem can be expensive because most parts places wont allow the return of electrical parts or will charge return fees. The EEC is a mini-computer and can be damaged by electrical surges etc.
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