OK so I put a EFI 5.0 in my car it runs and drives. The question is why do I have to crank it for about 6 seconds before it fires? It started immediately before I removed it from the donor. I was thinking maby the crank signal wire to the distributer? Any input appreciated.
When you turn the key on do you hear the fuel pump building pressure? If the car is running and you shut it off and then immediately try to restart, does it still crank for 6 seconds or fire right up?
Fuel pump builds pressure, new fuel filter, doesn't matter if its been a week or a minute still cranks long.
Is it holding fuel pressure after shut down??? If fuel pressure falls off immediately the pump has to build it up again... I doubt problem is ignition related, likely wouldn't start at all or run poorly if it did... And the obvious, have you scanned for codes???
From the original coil wire for run and Starter solenoid wire for start. I checked tonight and I have crank signal at dist.
i would check the fuel pressure during cranking. if thats good i would put a noid light on a fuel injector plug and see if its pulsing immediately when cranking or in about 6 seconds. after that i would look for spark to see if it takes 6 seconds for it to start sparking. those checks should point you in the right direction.
I will put a pressure gauge on tonight. Micah what do u suggest there I know the original resistor is still in line and possibly the donors resistor to. Should I just run the "run wire" thru a relay to test that issue?
OK just tested fuel PSI. pumps to 40 and stays. 35psi at idle and 30 when u shut it off. Then back to 40 when ignition is on.
Kansas, I don't know if there is a resister in the donor harness. I used the Ford Racing harness which had those wires located inside the passenger compartment with no resistor. I connected to the ignition switch at the column. I removed the wires from the plug, soldered my wires to the end of the pin and reassembled the plug. At this point, it is before the existing resistor wire in the car harness. My EFI harness will cut off power to the pump if it does not detect a start signal within one second. I don't know if your system is the same. If so, maybe a weak signal is not immediately telling the computer that you are starting the car. Instructions for my harness are here. Maybe it helps: http://www.jegs.com/i/Ford+Racing/397/M-12071-A50/10002/-1 Micah
so that tells you that its not a fuel bleed down/priming problem. now you need to determine if its spark or fuel control or both. get a fuel injector noid light from the auto parts to check the injector pulse and also check for the spark when cranking. those will tell us a lot of info on where to go next. also is it a mass air or speed density system. does it have a self test connector and a check engine light?
The quick way is pop it with a little starting fluid(or a squirt of gas in one of the vacuum ports on intake), then see if it tries to start almost instantly... If so can be assumed the ignition is probably OK...
So I'm not sure why but the issue is getting better today. After I checked the fuel pressure and purged the guage yesterday it acted a little better. now it is like 3 seconds to start. I guess I should have mentioned it earlier but it hasn't had a complete heat cycle because I still need a radiator. Could the computer just not be learned yet?
it could be a problem with the choke settings in the computer. it looks at water and air temp to decide on initial fuel amount to inject. you could have a bad sensor or bad wriring to one of the sensors.
