ok everyone, i got an 87 runner with 22re. for some random and odd reason when i drive at 30 mph steadily for more than a mile, my CEL will come on, but when i rev it up a few times or adjust my speed to something slower or higher itll turn off. last time i checked the codes, all i had was code 5 for the o2 system, i replaced the o2 sensor, but now its back. any ideas where to start my search as to why this code is still in the system? and yes i have reset the ecu after i replaced the sensor.

 

When you replaced the 02 sensor did you buy an OEM Denso replacement ?.
If you bought a Bosch 02 sensor as a replacement, they don`t work well if at all in toyota engines, and that is probably your problem.

 

I'm not entirely sure of the brand. and I did not know that, when I get more money I'll have to try the Denso one. thanks for the info!!

 

You should be able to return the one you bought. You can get denso's for about $50.00
www.discounto2sensor.com (That's just one of many)

 

actually I can't, I replaced it about two months ago. and thanks for the link

 

Disconnect the EFI fuse for a minute or so then see if it keeps happening.

And what type of O2 sensor do you have? 1 wire in the manifold by the head, or 3-4 wire down the pipe in front of the converter?

 

it's a one wire in the header.

 

and I'll try that

 

So, a header and one wire?
Guessing the O2 is down where all 4 exhaust comes together.

No wonder. Air flow will cool the O2 and make it read incorrectly.
You need a heated sensor or wrap the header and O2 so heat isn't lost.

 

actually it's up rather high on the header

 

Go to www.densoproducts.com you can get an OEM Denso 02 sensor for $30.00 dollars plus shipping.

I bought my 02 sensor from them. Good service and shipping.

 

sorry for the poor quality, flash light and an ipod at night

 

You have to post a pic before you can apologize for the quality.

 

 

yeah, i was working on that

 

Kind of odd the O2 is there 'tween 1 and 2, and there's a flange on #3 cylinder.

 

it is odd, but it came with the truck so I don't have much of a choice on it right now

 

And looking closer, the flange on #3 looks like it would be better suited to an EGR or air injection connection than O2- looks like an O2 there would hit #2 runner.

Even still, a 1 wire on #2 will cool off enough if there's enough air coming through the radiator. The factory had the 1 wire in a boss in the CAST IRON manifold between 2 & 3, and the iron held enough heat to keep it hot.

You could try a universal, heated one and see how it goes. Not sure about your emissions laws there though.... There's another thread bouncing around about a similar issue so maybe look it up, if you haven't already.

 

well in my city, I think state also, they only go back to 1996, anything older they don't bother, and I did see something about goin from a one wire to a heated sensor, I'll have to look into that, thanks