Third Generation F-Body Message Boards - From 1-wire O2 to a 4-wire O2...help...

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TWICEtheRICE

07-07-2005 05:12 PM

From 1-wire O2 to a 4-wire O2...help...

I have searched...

I have a 1991 Firebird w/ a 305 TBI computer and a 1-wire O2.

I installed headers and have a 4-wire AFS75 O2.

The wiring for the 4-wire goes:

A
TAN
1667
Heated Oxygen Sensor (HO2S) - Low

B
PPL
1666
Heated Oxygen Sensor (HO2S) - High

C
BLK
150
Ground

D
BRN
241
Ignition (ON)

QUESTION:

Which one is the signal wire for my computer (to splice into the oem 1-wire wire).

Is it A, B, or AB? <- Not blood type

Vader

07-07-2005 08:17 PM

Allow me to guess.

The purple one?

You can try this:

http://216.121.161.76/files/4WireHO2SRelayCircuit.gif

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