SPONSORED LINKS

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
SPONSORED LINKS
Monday, January 24th, 2011 AT 12:36 AM

9 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,758 POSTS
Oxygen sensors don't go in the intake manifold. The go in either the exhaust manifold or exhaust pipe.
Was this
answer
helpful?
Yes
No
Monday, January 24th, 2011 AT 12:46 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
O2 sensor Mounted On Exhaust Manifold Applicable to: 1981-83 Models
Image (Click to make bigger)
Thumb
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Monday, January 24th, 2011 AT 12:48 AM
Tiny
2OUTSEIDERS
  • MEMBER
  • 5 POSTS
Sorry, I meant exhaust manifold. Here is a picture
Image (Click to make bigger)
Thumb
Was this
answer
helpful?
Yes
No
Monday, January 24th, 2011 AT 1:09 AM
Tiny
2OUTSEIDERS
  • MEMBER
  • 5 POSTS
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.
Was this
answer
helpful?
Yes
No
Monday, January 24th, 2011 AT 1:13 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,758 POSTS
Do you have a check engine light? If you have a non-electronic carb, it may not have one.
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Monday, January 24th, 2011 AT 1:17 AM
Tiny
2OUTSEIDERS
  • MEMBER
  • 5 POSTS
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.
Was this
answer
helpful?
Yes
No
Monday, January 24th, 2011 AT 1:28 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,758 POSTS
It's 30 years old and carburetors were never very efficient. I don't know why your expectations are so high.
Was this
answer
helpful?
Yes
No
-1
Monday, January 24th, 2011 AT 1:31 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
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
Was this
answer
helpful?
Yes
No
Monday, January 24th, 2011 AT 1:41 AM
Tiny
2OUTSEIDERS
  • MEMBER
  • 5 POSTS
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
Was this
answer
helpful?
Yes
No
Monday, January 24th, 2011 AT 1:58 AM

Please login or register to post a reply.

Related Oxygen Sensor Replace/Remove Content

Oxygen Sensor Replacement
VIDEO
Oxygen Sensor Replacement
Instructional repair video
Oxygen Sensor Replacement
GUIDE
Oxygen Sensor Replacement
An oxygen or lambda sensor is used to determine the engine exhaust mixture which can then be controlled by the computer. These sensors are equipped with a heater that can...
VIEW MORE

Sponsored links