contactwilson
Jr. Member
- Joined
- Aug 26, 2009
- Messages
- 143
My EFI wont start. 1989 5.0 Mustang Engine/1993 Ford Mustang Factory Harness. I read through DanWheeler's (person on forum) who posted a troubleshooting link. Here is what I am looking at:
1. Engine fires when starting fluid is sprayed down throttle body
2. Fuel pump comes on when grounded to Self Test Connector
3. Fuel pump does NOT come on with key in run position (I know I should expect 2 seconds prime and stop)
4. EEC and Fuel Pump relays have been confirmed good and pinouts good (I also tried new relays with the same result)
5. I tried an A9L computer with pin 30 connected to pin 46
6. I tried a C3W computer with pin 30 connected to starting relay "S" post
7. I have a good confirmed ground that comes out by the computer
8. I have a good confirmed ground off the harness to the intake manifold
9. I have been very detailed about all grounds to bare metal including battery,frame,alternator,firewall,core support
10. The whole harness has been gone through and "cleaned up"
I HAVE 0.0 OHM RESISTANCE ON PIN 20 OF THE EEC
I HAVE 29.0 OHM RESISTANCE ON PIN 40 OF THE EEC
I HAVE 29.0 OHM RESISTANCE ON PIN 60 OF THE EEC
I understand the fuel pump is grounded by the computer to turn it on. Do I have a bad ground somewhere? All I know of is the two grounds on the harness (by the EEC and by the two ten pin connectors). Are there other harness grounds I am missing?
Any input is greatly appreciated. Thanks!!
1. Engine fires when starting fluid is sprayed down throttle body
2. Fuel pump comes on when grounded to Self Test Connector
3. Fuel pump does NOT come on with key in run position (I know I should expect 2 seconds prime and stop)
4. EEC and Fuel Pump relays have been confirmed good and pinouts good (I also tried new relays with the same result)
5. I tried an A9L computer with pin 30 connected to pin 46
6. I tried a C3W computer with pin 30 connected to starting relay "S" post
7. I have a good confirmed ground that comes out by the computer
8. I have a good confirmed ground off the harness to the intake manifold
9. I have been very detailed about all grounds to bare metal including battery,frame,alternator,firewall,core support
10. The whole harness has been gone through and "cleaned up"
I HAVE 0.0 OHM RESISTANCE ON PIN 20 OF THE EEC
I HAVE 29.0 OHM RESISTANCE ON PIN 40 OF THE EEC
I HAVE 29.0 OHM RESISTANCE ON PIN 60 OF THE EEC
I understand the fuel pump is grounded by the computer to turn it on. Do I have a bad ground somewhere? All I know of is the two grounds on the harness (by the EEC and by the two ten pin connectors). Are there other harness grounds I am missing?
Any input is greatly appreciated. Thanks!!