rotaryjunky

I am so tired of my engine light being on and getting an error code for the o2. I tried wiring it to the black wire on the top of the middle plug of my computer as I learned in this forum but I still get the code. Oh yeah, the wire was melted completely off by my turbo and I can't find the end of it. My car will be awesome someday but I need to start by solving this problem. Any information will help, except perhaps to buy a haltech, although that new computer that runs off a gameboy looks cool (for real).

rotaryjunky

Its a 1989 T2.

sunshine

iTrader: (3)

there is a free version of the Factory Service Manual at fc3s.org
Download the Fuel & Emission Section.
There is a diagram of the ECU there.

HAILERS

Pin 2C. Thats the middle plug. You count from the right to the left looking into the end of the plug where the wires enter the plug. You read in a up/down method starting from the top far right.

The 02 is the one sending a voltage TO the ECU, not the other way around. But you knew that, probably.

I got that pin from the online manual on the fc3s.org site. The 91manual, fuel section and a section in there called Control Unit, if I remember right.

There are no series five schematics to the best of my knowledge. I have not been there in a while, so things might have changed.

rotaryjunky

Thank you, I'll give it a shot.

Good thing these cars are cool. Oh yeah, and fast.

bcool

^ I just wish we could throw 'reliable" in there too

rotaryjunky

Your right, but I bet all those civic owners (mostly young kids) wish their cars were a little less reliable and a lot faster! Those with hatchback/B18C5's not included.

jon88se

If you're getting an 02 CE light, your gas mileage should really improve when it's working properly.

While TII's may not be the most reliable choice for daily use, NA FC's are brilliant daily cars IMHO.

rotaryjunky

I've been getting between 16 and 18 on 93 octane. But its money well spent. Especially since I drive the car about a 1K miles a year. Those new back seats should help to change that!

jon88se

Octane really shouldn't effect gas mileage when the car is in closed loop (cruising). You buy the 93 octane for your TII as a means of controlling knock - not for mileage or because it "burns cleaner" as many people will think. Octane value is directly related to knock resistance, nothing more.

Higher octane fuel burns more slowly and controlled...it's not as violent as the burn on low octane fuel. Any car will specify a need for high octane or not...pretty much all OEM forced induction cars recommend it and if they don't it should be used anyway. NA cars that don't specify a need for high octane are throwing $ out the window by using it.

If/when you change the O2, change your plugs as well. If your O2 was shot, chances are the plugs are over-fueled during cruise.

rotaryjunky

You mean those gasoline comercials were lying to me!? Now that my knock sensor connector stays on, it seems to make a difference when I ad octane booster. Of course, I am easily hypnotised and sugar pills relieve my headaches. Hopefully that g-tech comes in soon.