1 wire o2 sensor to heated o2s
11-29-2013, 06:34 PM
#2
Nothing to it. Check with a parts store. Been a while, iirc the '92 and/or '93 4.3L V6 Chevy pick ups had a 3 wire heated O2 sensor. Terminals A,B and C. The center wire (B) was the signal wire, like the only wire on your old one. A, or C, is ground (don't remember which ) and the other is heater power. A shop manual for those trucks should tell you which. The power wire is, on the trucks using those sensors, connected to the fuel pump relay wire terminal that powers the fuel pump. Pretty simple deal. Works very well for TPI cars, and TBI trucks when headers are added. Harder to get the O2 hot enough with headers.
Hope this helps.
Hope this helps.
12-03-2013, 07:54 AM
#6
TECH Fanatic
Real easy to make your own harness. I talked to Fastbird about it. I bought new GM O2s for a '94 Fbody, two factory pigtails, a relay, and some wire and went to town. Works great.
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12-04-2013, 04:48 PM
#8
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i'll be ordering the ones off your website as soon as my headers show up they should be here today. I want to tear it all down first and make sure nothing is missing. Thanks again.
I do have one question is this a must do when installing headers on a 93?
I do have one question is this a must do when installing headers on a 93?
12-04-2013, 05:36 PM
#9
Depends. If you're running shorties you shouldn't need to make the change. SOME mid lengths will need the upgrade, and it's a definite if you're moving to long tubes.
When I bought the 93 T/A I still have, it was with stock O2's and had MAC headers. I swapped those for the Arizona Speed and Marine headers from my other 93 I had, and the car wouldn't stay in closed loop. Both are mid-length designs, but the ASM's moved the O2's enough to warrant the change, the MAC's didn't move them back from the motor much at all.
When I bought the 93 T/A I still have, it was with stock O2's and had MAC headers. I swapped those for the Arizona Speed and Marine headers from my other 93 I had, and the car wouldn't stay in closed loop. Both are mid-length designs, but the ASM's moved the O2's enough to warrant the change, the MAC's didn't move them back from the motor much at all.
