o2 sensor's

jakes89f150 · Oct 4, 2008

so im trying to get a little better mileage out of my 1989 f150, it has a 302w EFI.
Im thinking the o2 sensors might need to be replaced, but i really dont want to replace all of them. I believe theres 3 or 4 of them and id like to get by with only replacing 2.
So my question is if i leave the one behind the cat alone and dont replace it. Is the computer going to listen to the 2 new o2 sensors (1 per header) and disregaurd what the one behind the cat is saying, or is it going to go into a default mode and run rich like it is?

Binder · Oct 4, 2008

Why do you think you have a bad sensor? Have you checked the trouble codes?

jeepmauler · Oct 4, 2008

Binder is the FIVE-OH 02 MUTHA ****ING KING!! WOOT WOOT!!:bananallama: :bananallama:

If Rick says doit..........doit..........even if you think it's gonna taste funny:;

crash2 · Oct 4, 2008

O2 sensors are not a maintenance item--they either work or not....

Totalled · Oct 5, 2008

There should only be one O2 on an '89..

jakes89f150 · Oct 5, 2008

Totalled said:
There should only be one O2 on an '89..

wouldnt be the first time i was wrong.
And to crash
i thought they had to be replaced every 60,000 miles.

and to binder i think there bad because my truck runs rich.

Totalled · Oct 5, 2008

jakes89f150 said:
wouldnt be the first time i was wrong.
And to crash
i thought they had to be replaced every 60,000 miles.

and to binder i think there bad because my truck runs rich.

Check the computer for trouble codes. It can be rich from a bad FPR, ECT, or ACT.

Binder · Oct 5, 2008

Lots of reasons it could be running rich....Mike is right a narrow band O2 (what you have) either works or it doesn't work. They can do some funky stuff in between but if that's the case then basically it isn't working.......Not sure what that has to do with the original question though?
Check your codes....