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1981 Toyota Pickup without oxygen sensor?

Tiny
2OUTSEIDERS
  • MEMBER
  • 1981 TOYOTA PICKUP
  • 4 CYL
  • 2WD
  • MANUAL
I just tried to replace the oxygen sensor in my 81 toyota pickup SR5 but couldn't find it. It looks like the intake manifold has a blank spot right where the sensor should go. Does anyone know what is going on? Did someone put an aftermarket manifold on to eliminate the o2 sensor? I looked around and could not find the wiring harness for the sensor. Did 1981 toyota's have o2 sensors at all? Any info would be appreciated.
Lonnie
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Monday, January 24th, 2011 AT 12:36 AM

9 Replies

Tiny
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Oxygen sensors don't go in the intake manifold. The go in either the exhaust manifold or exhaust pipe.
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Monday, January 24th, 2011 AT 12:46 AM
Tiny
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O2 sensor Mounted On Exhaust Manifold Applicable to: 1981-83 Models
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Monday, January 24th, 2011 AT 12:48 AM
Tiny
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Sorry, I meant exhaust manifold. Here is a picture
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Monday, January 24th, 2011 AT 1:09 AM
Tiny
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I'm looking at the diagram and I just don't know where or what it bolts into. Should go into the exhaust manifold but there is just a blank spot there.
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Monday, January 24th, 2011 AT 1:13 AM
Tiny
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Do you have a check engine light? If you have a non-electronic carb, it may not have one.
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Monday, January 24th, 2011 AT 1:17 AM
Tiny
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No check engine light that I know of. Carburetor only has a couple of wires going to it and they are for the fuel cut solenoid and the choke. 3 wires total. So it looks kind of like the engine doesn't have an oxygen sensor. Can anyone explain why I might be getting only 18 mpg out of this little 4 cyl? I figured I would be getting at least 25.
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Monday, January 24th, 2011 AT 1:28 AM
Tiny
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It's 30 years old and carburetors were never very efficient. I don't know why your expectations are so high.
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Monday, January 24th, 2011 AT 1:31 AM
Tiny
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There's a lot of contributing factors within the vehicle subsystems to mess with fuel economy such as the following-Badly needed tune-up and adjustments, carbueration problem, slipping clutch, brake dragging, wheel alignment and tires/suspension problem and the list goes on in my checklist
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Monday, January 24th, 2011 AT 1:41 AM
Tiny
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Thanks for your input guys. You've helped a lot. I was just baffled that the truck didn't have an o2 sensor. Again, thanks for the quick replies
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Monday, January 24th, 2011 AT 1:58 AM

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