oxygen sensor on 86 truck

[azdave35]

i have an 86 carbed 4wd truck...it didnt pass emissions and they are telling me it needs an oxygen sensor...as far as i can tell my truck doesnt have a computer...was this just a dummy sensor the japs put on it just to get it into the U.S.?

[qsd-dan]

The sensor regulates the amount of oxygen in the exhaust to tell the computer (yes there are computers in the carb equipt motors) to richen or lean out the mixture depending on the variables (and there are many). The sensor is located on the exhaust manifold, at least on the EFI models anyway.

When the sensor goes bad (the sensor usually gets “lazy”) they tend to make the motor run too rich, thus expelling more hydrocarbons (HC) and carbon monoxide (CO).

Get the sensor (make sure you get the Denso brand) from sparkplugs.com. They’ll cost around $35 vs. the dealer who will charge you $100+

[azdave35]

i dont think the computer does anything to richen or lean the mixture...there are no electronics in the carb....every computer carb i have ever seen has an electronic jet in it

[Mavericks House]

I just bought an O2 sensor from oxygensensors.com, a walker, the local toyota dealer installed and it only took 15 min.. $79 U.S.. It corrected the "check engine" light and truck is working again like it use to. It was drinking the fuel 'til the new unit was installed. It's a '96 Taco V6 Xtracab 4x4.. I was going to but a denso but that particular was tos so I ordered the Walker......no probs..