Air fuel ratio meter install???

[88workcar]

What wire on the 02 sensor am I suppose to use? One is a ground, one makes the meter show lean, and when I rev the motor it goes up one bar. If I connect to the other 02 wire the meter shows rich all the time no matter how I run the motor.

[bigred90gt]

Originally posted by PKRWUD
looking at the connector, from the ECM, the X marks where the wire is you want to attach the a/f gauge to:

1 -0000000000 - 0000000000-20 (20 is a black wire)
21-00000000X0 - 0000000000-40 (40 is a black wire w/ a lt. green tracer)
41-0000000000 - 0000000000-60 (60 is also a black/lt. green wire)

This is from when Chris helped me with mine.

[It's Exgmguy]

Don't trust those gauges. They are only toys.

[WADS56]

Originally posted by It's Exgmguy
Don't trust those gauges. They are only toys.


It's not the gauge that is crap, it's the o2 sensor. The gauge reads the voltage that is sent to the ECM and converts it to a nice LED display. You are geting the same reading that the computer is making adjustments with. :)

[420nitro]

Is running an EGT out of the question?
I just think by getting an EGT that you could get a more accurate condition of tune. Then you don't have to worry about running leaded race gas! There's alot out there from the autometer, to the Arc 1500 which is digital. It will rec. the high and low temps from the run and price is about $300.

[WADS56]

EGT's are a great way to tune your car and IMO much better then a 3 wire O2 sensor with a gauge. You just have to make sure you hook the EGT up to the cilinder that will run the most lean (I think #6 or 7) The best would be a 7 wire wideband O2 though. You will get a dead on reading right from the collecter and can do some serious tuning.

[It's Exgmguy]

I had one of those A/F gauges and was completely melting the ends off spark plugs while it read deep in the rich zone.

It would be nice to have an in-car wideband.