Help

87hilux7mge · 05-02-2011, 06:33 AM

far as i know all mk3's should have an o2 sensor...

Daluz · 05-02-2011, 10:32 AM

yeah i know they all should, but the person before me changed out the stock headers and downpipe which relocated the o2 spot to right before the cat, but he blocked off the o2 slot will like some steel sheet, and then he might have cut the wire

907mge · 05-02-2011, 11:03 PM

I also have an aftermarket header with the o2 sensor in the same location which causes a CEL. Now I don't know if that is your problem but I am going to move the sensor on mine up so it is much closer to the stock location. It seems that just extending the wire can cause problems as well as the temp drop because of the lower location down the pipe.

87hilux7mge · 05-02-2011, 11:42 PM

if the o2 sensor is not close enough to the collector or too far down stream, it will not get hot enough and your car will not run properly.

an option would be to get a heated o2 sensor. then it gets to operating temp quicker. but ive also had them falsify readings when placed too far down the exhaust. the car ran fine, but poor mileage ensued.

Daluz · 05-03-2011, 01:14 AM

yeah true, but the car isnt running an 02 sensor at all which i think is my problem, it looks like he cut the wire on the wiring harness or i just cant find it, im prob going to try to but the oem headers and down pipe and just do custom pipe after the down pipe

87hilux7mge · 05-03-2011, 03:06 AM

id say thats definitely your problem.

Daluz · 05-03-2011, 03:11 AM

yeah it just sucks cause now i dont know where the damn connection is ive looked on numerous occasions

05-02-2011, 06:33 AM	#1
87hilux7mge walbro fp Join Date: Dec 2010 Location: spokane Posts: 479	far as i know all mk3's should have an o2 sensor... __________________ 87 toyota 4x4 single cab short box pickup, 7MGZE.

05-02-2011, 11:42 PM	#4
87hilux7mge walbro fp Join Date: Dec 2010 Location: spokane Posts: 479	if the o2 sensor is not close enough to the collector or too far down stream, it will not get hot enough and your car will not run properly. an option would be to get a heated o2 sensor. then it gets to operating temp quicker. but ive also had them falsify readings when placed too far down the exhaust. the car ran fine, but poor mileage ensued. __________________ 87 toyota 4x4 single cab short box pickup, 7MGZE.

05-03-2011, 03:06 AM	#6
87hilux7mge walbro fp Join Date: Dec 2010 Location: spokane Posts: 479	id say thats definitely your problem. __________________ 87 toyota 4x4 single cab short box pickup, 7MGZE.

05-02-2011, 10:32 AM	#2
Daluz Stock Join Date: Apr 2011 Location: Seminole, Florida Posts: 22	yeah i know they all should, but the person before me changed out the stock headers and downpipe which relocated the o2 spot to right before the cat, but he blocked off the o2 slot will like some steel sheet, and then he might have cut the wire

05-02-2011, 11:03 PM	#3
907mge 20psi boost Join Date: Dec 2009 Location: Harrisburg Posts: 759	I also have an aftermarket header with the o2 sensor in the same location which causes a CEL. Now I don't know if that is your problem but I am going to move the sensor on mine up so it is much closer to the stock location. It seems that just extending the wire can cause problems as well as the temp drop because of the lower location down the pipe.

05-03-2011, 01:14 AM	#5
Daluz Stock Join Date: Apr 2011 Location: Seminole, Florida Posts: 22	yeah true, but the car isnt running an 02 sensor at all which i think is my problem, it looks like he cut the wire on the wiring harness or i just cant find it, im prob going to try to but the oem headers and down pipe and just do custom pipe after the down pipe

05-03-2011, 03:11 AM	#7
Daluz Stock Join Date: Apr 2011 Location: Seminole, Florida Posts: 22	yeah it just sucks cause now i dont know where the damn connection is ive looked on numerous occasions