Well here is my problem. Bank one (or Two) (injectors 2,3,5,6) are staying open and flooding my engine out. The only way that I have been able to fix this problem is to unplug the EEC and plug it back in again. With that I was thinking that the EEC was bad, so I replaced it the other day. Truk ran great for about 150 miles then wham its back. Unplug the EEC and reconnect and its all good.

Yesterday it did it while it was idling after being shut off for an hour. After about 60 to 90 seconds it started acting up! Did the EEC and it was fine.

Only codes I get is 31 33 and 41. EGR, EVP and lean o2. Would the lean signal cause this with a bad o2 sensor??

Any other ideas?

 

No oxygen sensor reading would cause the computer to think the injectors needed to stay open! You either have a short in the harness in the Tan/Red or Tan/Orange (whichever one goes to the injectors that are open) OR your computer is bad. Trace the appropriate wire from the injector rail to the computer connector looking for a short. If you don't find one, NAPA sells reman computers for about $180.

 

Aftertalking with Ford SVO last night. we can to two conclusions, one the EEC is bad and two the white or tan wire going from pin 59 to injectors is shorting out somewhere. Number one has been narrowed out, cause I bought a new EEC (100 dollars) and the problem is still there somewhere. So I am going to check the continuity of the wires and see what I get. In the Haynes manual there is a test for continuity and what resistance I should get. For a wire to ground short test, all injectors unplugged, there should be >10000 ohms, for a injecotr to pin 59 check, all injectors unpluged, there should be <5 ohms of resistance.

 

The fuel injector circuits in the PCM are sinking. That is, they switch to ground. Your vehicle wiring supplies positive 12 volts to both banks of injectors. The two banks then go separately to the PCM. If one bank is energised without the PCM control, my guess is that you have an intermitant short to ground someplace between the injector bank and the 64 pin plug to the PCM. Intermitants can be hard to find, but a careful inspection of the harness on that route should reveal it.
Robert

 

It happened again this weekend. I loaded my bike up for a race in IL and I had it idling. After I got the bike on it started to idle like crap and what not. So I figured I would take a look at the harness resistance and continuity. Shut the motor off and checked. Iunplugged the 4 injectors, and checked the resistance 3 ohms, just where it should be. Then i checkedpin 59 (bank 2) to ground. I had to check it at the connecter just past the EEC (could connect to pin 59 good) and it all looked good. Plugged that connector back in and fired her up on 4 cylinders, plugged in a fith injector, ran better then another and another. Everything seemed to work great. From what I could see of the harness and inspect it all looked good. Only spot I couldn't check was the passenger side of the harness. Upper intake was in the way.

Drove 45 miles to a friends house, then 100 miles to IL for the race, and 150 miles back home later that day. No problems at all. Got me. Maybe it was in that connector? All I know it seems to work, but for how long, at least i know it is somewhere in the injector harness. I am going to run it until thanksgiving then over the holiday I am going to pull her into the garage and see what I can find.

Thanks for all your help.

 

Just a thought, but i would also check for a bad injector that might be killing the computer? Good luck

Dave Powell