3 wire o2 hookup
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3 wire o2 hookup
i just recieved the 3 wire o2 sensor part#afs74 i ordered. I know 2 wires are for the heater, but which is for the sensor? 2 wires are black and the other is blue on the weatherpack connector.
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From: MA
Car: '87 IROC/'68 SS
Engine: 5.7L/350
Transmission: 700R4/Muncie 4-spd
Axle/Gears: 3.27 9 bolt / 3.31 12 bolt
Re: 3 wire o2 hookup
The two black ones should be the heater. Measure the resistance between them. It should be pretty low (<1K ohm).
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From: Orange, CA
Car: '90 Trans Am-12.45@110.71
Engine: 355 w/AFR 195's Elem. 400/430 HP/TQ
Transmission: Tremec T-56
Axle/Gears: 12 Bolt 3.73
Re: 3 wire o2 hookup
The blue wire is the sensor, the other two are the power and ground.
And it doesn't matter which one is power.
Hook one of them to ignition source and the other to a good ground.
And it doesn't matter which one is power.
Hook one of them to ignition source and the other to a good ground.
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