You will hear some relays engage and the fuel pumps prime the system. Try to keep your self from getting distracted from here on. Get a length of wire that can connect the STI to the negative battery terminal or body ground. If your EEC is wi red correctly, the engine light works, and there are not any electrical faults in the vehicle you can get the codes out of your EEC. To check for codes without buying a code reader is simple. The self-test plugs were mounted on the passenger side fender fender on 1985-86 EFI trucks. The self-test self-test plugs plugs are located located along along the driver driver s side fender fender behind behind the air filter box on 1987-95 EFI trucks. The self-test plugs are located along the driver driver s side fende fenderr by the firewall firewall on on 1986-95 1986-95 Mustangs Mustangs.

The other is a smaller single pin plug it is called the Self-Test Input (STI). One is triangular and has 6 pins it is called the Self-Test plug. First you need to find the self-test plugs to read read codes from the EEC. How To Run a Self-Test Don’t worry if the Check Engine Light is not on, the computer will store lesser important codes without flashing lights i n your face. Also, I have heard, but never verified, that if Ford rebuilt an engine, they changed the date code to reflect the rebuild.Ford Fuel Injection » How To Run a Self-Test Please remember that it is possible, even likely, that the year the engine was assembled will be the year before the car’s model year. I should credit Flathead Jack’s catalog as my first source for this information, although I have now seen it in several places. If you can’t, refer to one of the flathead books available or one of the other flathead web sites. G 20 B would be an engine manufactured on January 20, 1952.Īs for the other styles of blocks, most folks can identify the engine series if not the exact date of assembly. The number is the day, and the second letter is the last digit of the year. It consists of a series of a letter, a one or two digit number, and a second letter. You can see it with the intake manifold and heads still on the engine. On late model flatheads without the bell housing cast into the block, there is a code stamped on the right rear corner of the intake gasket face of the block which will give you the manufacturing date of your flathead Ford or Mercury.

Ford engine codes