Oxygen Sensor questions

mrnickleye · 01-25-2006, 12:33 AM

Trust me (see my profile), you can get an aftermarket 3-wire 02 for about $75. Bosch is the most popular at the parts houses. You can get one with the oem plug already on to just plug-n-play.

You may want to spray some WD40 (or similar) on the threads a few times and hours before removing it.

If your mech. said fuel 'lines', (carboned up) get a new mechanic, he IS ripping you off, cause that just won't happen. Also, we only charge $65 labor to replace the 02. (and we also re-check everything to make sure you are gonna pass the test).

It is very true that carbon builds up on the inside of the intake manifold. This is due MOSTLY from the EGR system feeding exhaust gasses into the manifold. It also builds up on the intake valves.

Maybe he meant that the carbon is built up in the egr passages, and therefore the egr system is not working, and will cause the NOx to be too high.

I would ask around (friends, family, co-workers, grocery store clerks, etc) for a recommended shop to check out your car, and make some of the repairs if you can't. Cleaning the egr passages is work, but easy, but does take some mechanical skill, and knowing what to remove and clean.

If you idle is high, you WILL fail the test. That sounds like other issues. How do you drive with that??

RyDeFly · 01-25-2006, 03:05 AM

Like I said, the throttle is jacked up; its the assembly that runs along top of the engine near the firewall. The thing is way loose, so the cable is not retracted all the way, making the idle 2000-2500. I can pull it back with my hand and the idle will drop.

Once I engage the clutch, the rpms drop back down to what it should be, so driving it is not that hard... probably just stresful on the clutch though.

I'm pretty sure the mechanic said "fuel line", and he refered to "flushing it out" because of carbon deposits from it running rich for so long. BS then?

Also, maybe the "turbo hose" he was talking about is a vacuum line?

Thanks for you help guys.

kewlcoconut · 01-25-2006, 06:21 AM

dammit. i just spent like 5 mins writing a response to all your questions and browser somehow jumped back to the main page....so here it is in short

Google the o2 sensor for the supra. or visit stores you know. you can get it for under $100 easily. I heard Bosch isnt that great, people say they crap out pretty easily. Although that is just speculation. The Denso sensors can be different. you can get ones with the connectors, or with just the wire to connect to the old sensor wire. and here is a link on how to heat shrink all that stuff.

http://photos.dylanwiggins.com/thumbnails.php?album=146

as for your fuel line, do you ever use fuel injector cleaner? it does wonders if you use it. I make it a habit to use it every 1500kms or so. just to keep my fuel system good.

mrnickleye · 01-25-2006, 07:13 AM

perhaps the mechanic meant the fuel injectors were carboned up. This can be a common problem. Do as mentioned above, and use fuel injection cleaner in the fuel tank to clean out 'varnish' in everything, and carbon on the tips of the injectors.
Dirty injectors can stick open, and/or spray in a crappy pattern, which can cause engine running problems.

kewlcoconut · 01-26-2006, 01:08 AM

I highly suggest buying a new o2 sensor. I JUST replaced mine today. And took some pics of the old one. It's horrible looking.........change yours!!

01-25-2006, 12:33 AM	#1
mrnickleye 1000whp postwhore Join Date: Jun 2005 Location: Mojave Desert, Calif. Posts: 1,705	Trust me (see my profile), you can get an aftermarket 3-wire 02 for about $75. Bosch is the most popular at the parts houses. You can get one with the oem plug already on to just plug-n-play. You may want to spray some WD40 (or similar) on the threads a few times and hours before removing it. If your mech. said fuel 'lines', (carboned up) get a new mechanic, he IS ripping you off, cause that just won't happen. Also, we only charge $65 labor to replace the 02. (and we also re-check everything to make sure you are gonna pass the test). It is very true that carbon builds up on the inside of the intake manifold. This is due MOSTLY from the EGR system feeding exhaust gasses into the manifold. It also builds up on the intake valves. Maybe he meant that the carbon is built up in the egr passages, and therefore the egr system is not working, and will cause the NOx to be too high. I would ask around (friends, family, co-workers, grocery store clerks, etc) for a recommended shop to check out your car, and make some of the repairs if you can't. Cleaning the egr passages is work, but easy, but does take some mechanical skill, and knowing what to remove and clean. If you idle is high, you WILL fail the test. That sounds like other issues. How do you drive with that?? __________________ Had a Red 1989 N/A. Automatic. Sports Pkg. w/wing. TEMS, and some nice MODS. Sold to a friend 10/08/08.

01-25-2006, 07:13 AM	#4
mrnickleye 1000whp postwhore Join Date: Jun 2005 Location: Mojave Desert, Calif. Posts: 1,705	perhaps the mechanic meant the fuel injectors were carboned up. This can be a common problem. Do as mentioned above, and use fuel injection cleaner in the fuel tank to clean out 'varnish' in everything, and carbon on the tips of the injectors. Dirty injectors can stick open, and/or spray in a crappy pattern, which can cause engine running problems. __________________ Had a Red 1989 N/A. Automatic. Sports Pkg. w/wing. TEMS, and some nice MODS. Sold to a friend 10/08/08.

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01-25-2006, 03:05 AM	#2
RyDeFly Stock Join Date: Nov 2005 Posts: 9	Like I said, the throttle is jacked up; its the assembly that runs along top of the engine near the firewall. The thing is way loose, so the cable is not retracted all the way, making the idle 2000-2500. I can pull it back with my hand and the idle will drop. Once I engage the clutch, the rpms drop back down to what it should be, so driving it is not that hard... probably just stresful on the clutch though. I'm pretty sure the mechanic said "fuel line", and he refered to "flushing it out" because of carbon deposits from it running rich for so long. BS then? Also, maybe the "turbo hose" he was talking about is a vacuum line? Thanks for you help guys.

01-25-2006, 06:21 AM	#3
kewlcoconut 3" Exhaust Join Date: Sep 2005 Location: Vancouver, BC Canada Posts: 157	dammit. i just spent like 5 mins writing a response to all your questions and browser somehow jumped back to the main page....so here it is in short Google the o2 sensor for the supra. or visit stores you know. you can get it for under $100 easily. I heard Bosch isnt that great, people say they crap out pretty easily. Although that is just speculation. The Denso sensors can be different. you can get ones with the connectors, or with just the wire to connect to the old sensor wire. and here is a link on how to heat shrink all that stuff. http://photos.dylanwiggins.com/thumbnails.php?album=146 as for your fuel line, do you ever use fuel injector cleaner? it does wonders if you use it. I make it a habit to use it every 1500kms or so. just to keep my fuel system good.

01-26-2006, 01:08 AM	#5
kewlcoconut 3" Exhaust Join Date: Sep 2005 Location: Vancouver, BC Canada Posts: 157	I highly suggest buying a new o2 sensor. I JUST replaced mine today. And took some pics of the old one. It's horrible looking.........change yours!!