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Day 3: The real test, drove the car to work (man I really, REALLY, need to get the power steering pump fixed). It ran great again! Dare I say it, I think it may be fixed? :shrug:

The only problem with the fuel injection that I can think of is the Left O2 sensor is not installed. There is a plug in the O2 bung that is stuck. Also, the fuse for the power wire of the Left O2 kept blowing. Since that O2 isn't hooked up anyway, I went ahead and disconnected the wire until...

Well I narrowed the fuse blowing problem down to the power wire for the left O2 sensor. I disconnected the wire, replaced the fuse, and the car ran great. The O2 wire must be grounded somewhere. I took the car for a drive it ran great. So I brought it back and ran the codes. Got 81, 82...

Have never pulled the distributor. Will check firing order... I had an idea. What if I replace the fuse then unplug the MAF and try to start it again an run the test? If the fuse still blows, I will know the problem is with the Left MAF (or a short in the wiring). If the fuse does not...

After further inspection, this 15 amp fuse is prior to the Power wire for MAF and the Left Oxygen Sensor. I don't have the Left O2 sensor hooked up, not sure if that or the MAF is causing the problem? Come to think of it, I guess that the computer could have also caused this? Maybe there is...

I checked the four fuses that came with the new EFI harness. The 15 amp fuse was blown. So I replaced it and found that I had 12 volts at the MAF. However, when I did a Key On Engine Running test, the fuse blew. I did a KOEO test first and got the same codes as before 81, 82, 84 &...

Got a new fuse for my multimeter. There was no voltage between A&B with the connector plugged in and key on engine off. With the connector unplugged I did not get anything when measuring ohms between C or D and (body ground, battery or B), it just said .0F. I measured 3.9K ohms between...

Went for a test drive this morning. It ran like a complete dog as expected. I really don't understand how it can run perfectly fine one time and like complete crap the next. I tried to check voltage at the MAF, but for some reason, my multimeter doesn't want to read voltage now? It will...

After much deliberation, I decided to purchase a universal EFI harness and re-wire the fuel injection. The original harness had so many wires that were cut/spliced, just plain cut, and missing. I decided the best plan would be to remove the old harness (cancer) and rule that out. I have been...

Thanks! I'm going to have to try that one tomorrow.

More info and this just seems wrong to me, the sending wire for my A/F guage runs and splices together with the green/yellow (pin #30) wire and red/black (pin #43) wire, right before it gets to the computer. Isn't that way off? Shouldn't it be hooked up to only the red/black wire (pin...

Funny story, when I have pin "30" grounded to trick the computer into thinking the car is in neutral, my A/F ratio guage doesn't work??? WTF? Jrichker, any thoughts on this one?

Still haven't ordered the new O2 sensor harness. Is there anywhere to get one of those used? $100 shipped seems like a lot... I didn't see any on ebay or in the classifieds.

Did cylinder balance test. I got code 80 - "cylinder 8 has a problem". Once it cools down I will try to get the spark plug out and look at it. I have JBA shorty headers and that plug is a major PITA to get too. Oddly enough that was not one of the wires that had more resistance.

The computer is an A9P. Part # starts E9ZF...so that would indicate '89. The harness, I believe, is a complete EFI (MAF) conversion harness from ford. Could be why the colors are inconsistent with the diagram. The connectors are all marked. I'm not sure if I ever had the installation...

The reason I'm thinking about replacing the wiring entirely is the wires I have coming from my right O2 sensor are gray/blue, gray/pink and black/white. Diagram says it should be dark green/pink. At the computer I have gray/blue at pin #29 and red/black at pin #43. Should be dark...

I'm going to have to try the balance test tomorrow. Will it work properly even though it said 6cyl? I'm also considering bypassing the factory harness and running brand new wires for the O2 sensors. The wires for the driver side have been cut (not sure where). The passenger side is the only...

Think I got the under-dash wiring issue solved. Was able to do the Key On Engine Running test with the tester. First problem: The cylinder ID code came up as 6. The codes I got were: 31: EGR valve control system below minimum voltage (I don't have EGR) 91: HEGO sensor voltage...

Ok, let's just say, you know hypothetically speaking, that my computer isn't getting a sufficient amount of power. Could that cause the problem I am having? Also, is the power for the Fuel pump supposed to come from the computer or is it a signal that turns on a relay?

Ok, got to thinking. What if the #1 terminal has power all the time? Apparently it does (does now anyway...). So with key off still have 12V. This means that there has to be a key on terminal. Don't know which terminal that is? Anyway, I think the short (sparks) I had earlier hurt...