[Turbo Bronco II]

I'm Still trying to get my 2.3 turbo bronco II on the road but I keep runing into problems. First I had a bad miss so I pulled the spark plugs and found #2 was soaked so insted of doing a compression test I pulled the head to check for cracks and the condition of the pistons. Found out all was good, all that was wrong was #2 injector was stuck open and dumping fuel making it darn near hydrolock, and smoke pretty good. So I got a Fel-Pro 1035 head gasket , new head bolts, square style intake, new brown top injectors and removed the Egr. So now it runs again (exhaust is like tear gas) but not very peppy. I think I fried the 3" vam. It runs the same with it pluged in or unpluged. I got an LA3 a while back and repined my harness but I think I was too late the pins didn't match any diagram I could find. Any one have a way to test a large VAM and have a good wiring diagram. Also I changed from a 1 wire o2 sensor to a 3 wire 88 T-bird o2 sensor and was slightly confused on the wiring for that also. Thanks

[NavySVO]

does it throw codes?
As for the wiring diagram, pm me an email address to send it to. I have attached a troubleshooting procedure for the VAF meter.
here is a site for the re-pin of an LA3. LA3 swap into an SVO
In addition, caroth over on turboford has tons of info as well.
here's another site for pinouts as well
2.3 Turbo EEC-4 Specifications, Part Numbers, Calibration Codes, and Pinouts

[Turbo Bronco II]

Thanks NavySVO for the VAM test page, I checked all my wires and they all have 5V so I'm asuming my Vam is bad. The only time I get my Vam to change from 5V signal is when I brake the contact between VREF and the needle. Also is the 02 sensor signal wire send 0-5v back to the ECM?

[NavySVO]

Originally Posted by Turbo Bronco II

Also is the 02 sensor signal wire send 0-5v back to the ECM?

I will have to look that up when I get home.

Why did you change from a 1 to a 3 wire O2 anyway?

If you are running 5 VDC with the VAF meter, I am surprised it even runs at all. I am guessing that is why the exhaust is so smokey. Is it black (rich)?
My VAF meter vane got stuck WOT and it wouldn't start (flooding).

Does it throw any codes?

Do you still nee a wiring diagram or were the links good enough?

[NavySVO]

3 wire O2 sensor:

according to the schematic I have:
one of the 3 wires goes to pin 29, one to the ignition run circuit, and the other goes to Battery Ground.
In addition, pin 49 grounds to the chassis for the HEGO

PM me an email address and I will send the schematic and O2 sensor troubleshooting procedure your way

[mg man 75]

I thought pin 49 went to turbo intake?

[NavySVO]

it may. I was guessing as the schematic doesn't specify.....

[mg man 75]

Only reason I mention it. Wasn't in writeup. I was getting bad gas mileage. Read on turboford that was one posibility. Said to get as close to 02 sensor as possible. Since can't put on hot side they said put on cold side.

[Turbo Bronco II]

I changed to a 3 wire o2 simply because That is what Kragen gave me when I asked for a o2 for an 88 Tbird. According to the wiring diagram that came with the sensor the 2 white wires are 12v for the heater and the 1 black is signal, so when I fired it up it gave me 4.8V (or something close to that I can't remember) I'm assuming that is rich because of the black exhaust so for now i'm just trying to find a reasonable priced 3" VAM, there all about $115 at the part stores