WITHOUT OXYGEN SENSOR?

1981 Toyota Pickup

Tiny

2outseiders

January, 24, 2011 AT 12:36 AM

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

FOUND 165 RELATED QUESTIONS

9 Answers

Tiny

Wrenchtech

January, 24, 2011 AT 12:46 AM

Oxygen sensors don't go in the intake manifold. The go in either the exhaust manifold or exhaust pipe.

Tiny

rasmataz

January, 24, 2011 AT 12:48 AM

O2 sensor Mounted On Exhaust Manifold Applicable to: 1981-83 Models

Tiny

2outseiders

January, 24, 2011 AT 1:09 AM

Sorry, I meant exhaust manifold. Here is a picture

Tiny

2outseiders

January, 24, 2011 AT 1:13 AM

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.

Tiny

Wrenchtech

January, 24, 2011 AT 1:17 AM

Do you have a check engine light? If you have a non-electronic carb, it may not have one.

Tiny

2outseiders

January, 24, 2011 AT 1:28 AM

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.

Tiny

Wrenchtech

January, 24, 2011 AT 1:31 AM

It's 30 years old and carburetors were never very efficient. I don't know why your expectations are so high.

Tiny

rasmataz

January, 24, 2011 AT 1:41 AM

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

Tiny

2outseiders

January, 24, 2011 AT 1:58 AM

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

Please login or register to post a reply.

Oxygen Sensor Replacement Dodge Stratus
Oxygen Sensor Replacement Honda Civic 1996-20
Fail Your Smog Test? Fix it Fast
How to gather codes Ford Explorer
Code Read Retrieval/Clear Mercedes Benz
Code Read Retrieval/Clear Honda Civic