Please advice on O2 sensors
#11
follow the troubleshooting
https://www.obd-codes.com/p0155
https://www.obd-codes.com/p0155
Don't guess!
Follow the troubleshooting in the link I gave you.
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the Brain (November 27th, 2022)
#12
re: o 2 sensor removal. go on you tubes . (get the premium subscription for a month, you won't get d bombed hill trying to watch a 15 minute video. ) there is a video by a guy who says some of the o 2 sensors are more easily removed when the exhaust system is warm. (that makes no sense to me because metals expand w heat. maybe he socket for the o 2 sensor expands when it's warm then you can get the señor out more easily, I dunno. the videos by south main auto are especially good. nd remember
aJoe says to clean it not just tighten it.
aJoe says to clean it not just tighten it.
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the Brain (November 27th, 2022)
#13
CF Active Member
Thread Starter
Don't guess!
Follow the troubleshooting in the link I gave you.
https://www.youtube.com/watch?v=svDzJMEnVD0
Follow the troubleshooting in the link I gave you.
https://www.youtube.com/watch?v=svDzJMEnVD0
Test O2 sensors wiring
Lite blue wire -0.01VDC
Pink should have battery voltage 12VDC
Purple/white trace ½ volt .43VDC
Tan 0.04VDC
from bottom I can't remove the O2 w/ a crestent wrench and small cheater pipe, it's not leverage I'm lacking it's to tight no room to move wrench, maybe the front O2s are removed though the top by removing doghouse.
in addition to slite socket I may need a folding racket which I still don't have.
edit: while under there all the wiring was attached nicely ontop of frame away from the hot exhaust pipe, after I get sensor installed I'll have to figure out how wires where secured to frame.wires where in good shape no burns thanks mountainmanjoe excellent advice as usale.
re: o 2 sensor removal. go on you tubes . (get the premium subscription for a month, you won't get d bombed hill trying to watch a 15 minute video. ) there is a video by a guy who says some of the o 2 sensors are more easily removed when the exhaust system is warm. (that makes no sense to me because metals expand w heat. maybe he socket for the o 2 sensor expands when it's warm then you can get the señor out more easily, I dunno. the videos by south main auto are especially good. nd remember
aJoe says to clean it not just tighten it.
aJoe says to clean it not just tighten it.
edit: heating up the exhaust then work on it no no not for me thats a good way to burn the skin.
Last edited by the Brain; November 27th, 2022 at 12:17 PM.
#14
metal SWELLS with heat. In all directions. Inward and outward. The who point of using heat is that different parts expand and contract at different rates when heated and cooled. This breaks them free for you to loosen. (Nothing to do with making them bigger or smaller). I'm not sure exhaust gets hot enough to make a difference though.
or, get an ad blocker for your browser, and you don't have to watch ads, or pay anything.
SMA is an excellent channel. And you always see Eric break out his torch, and get those exhaust bolts red hot before hitting them with the impact wrench.
well he said it was clogged up. I can't imagine that a sensor intended to measure gases is going to work very well when the gasses can't get to it.
All that carbon isn't a good sign, by the way. The engine is probably running too rich, and the cats might shot.
or, get an ad blocker for your browser, and you don't have to watch ads, or pay anything.
SMA is an excellent channel. And you always see Eric break out his torch, and get those exhaust bolts red hot before hitting them with the impact wrench.
well he said it was clogged up. I can't imagine that a sensor intended to measure gases is going to work very well when the gasses can't get to it.
All that carbon isn't a good sign, by the way. The engine is probably running too rich, and the cats might shot.
#15
They should be different. That's how the computer knows the catalytic converter is working. There should be pulses of oxygen in the exhaust stream immediately after the engine. There should be none after the cats because the oxygen has been chemically reacted.
the first thing you'll want to do is graph the live data from the O2 sensors.
the only thing adjustable wrenches are good for, is rounding off nuts and bolts. Especially on stubborn, seized, rusty exhaust parts. Get yourself a proper O2 sensor socket. They don't cost that much.
You can do almost anything with the right extensions and a u-joint
I take that advice back. It's better just to replace it. (if that's where the problem lies!)
long sleeves and gloves!
It's winter anyway.
#16
Mountain man recommended the car wizard you tube and it is an excellent 32 minute read.
One of wizard s tips is using some huge long extensions to get at fittings too tight to access w a standard socket. One of the car wizard s tips was how to do that.
at 140$ an hour OP could buy some of the stuff the wizard recommends . Get that o 2 sensor out !,,
One of wizard s tips is using some huge long extensions to get at fittings too tight to access w a standard socket. One of the car wizard s tips was how to do that.
at 140$ an hour OP could buy some of the stuff the wizard recommends . Get that o 2 sensor out !,,
#17
CF Active Member
Thread Starter
yes I saw the folding racket w/ builtin O2 socket, I imatated it w/ a regular racket an a universal. not enough room was able to turn o2 socket w/ the cresent, a 18mm wrench would have made it less hard. anyway I was able to swap the 02 sensor.
how many engine on/off cycles before the check engine light goes away? my count is 3 ons & offs.haven't driven her yet to see if I get extra power. thanks Guys for advice.
how many engine on/off cycles before the check engine light goes away? my count is 3 ons & offs.haven't driven her yet to see if I get extra power. thanks Guys for advice.
#18
Anyone who can change an O2 sensor with a racket must be a magician
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MitchM (January 29th, 2023)
#19
OP Brain : can you not turn off the current CEL with a scan tool ? or have auto zone or a friend etc. do that ?
then if it comes back on, you need to observe the P Code DTC on a scan tool , and proceedings accordingly to fix what ever else the P code suggests .
then if it comes back on, you need to observe the P Code DTC on a scan tool , and proceedings accordingly to fix what ever else the P code suggests .
#20
CF Active Member
Thread Starter
I removed the engine cover the other day found a few broken exhaust manifold bolts.
1 on #8
2 on #7
Already knew about front most on #1
3 total broken mannie bolts.
I’ve been informed that a broken mannie bolt will interfere w/ the O2 sensor.
Could a broken bolt on #8 ruined my upstream pass. Side O2 sensor I recently replaced?
I’m not hearing any extra exhaust noise or smelling carbon monoxide fumes.
I do see some carbon blackness on both #7 & #8 but have sean much worst blackness
On images from net.
Could these leaks lessen my power & fuel milage?
Planning to use these clamps to repair the broken bolts.
What do you Guys think
1 on #8
2 on #7
Already knew about front most on #1
3 total broken mannie bolts.
I’ve been informed that a broken mannie bolt will interfere w/ the O2 sensor.
Could a broken bolt on #8 ruined my upstream pass. Side O2 sensor I recently replaced?
I’m not hearing any extra exhaust noise or smelling carbon monoxide fumes.
I do see some carbon blackness on both #7 & #8 but have sean much worst blackness
On images from net.
Could these leaks lessen my power & fuel milage?
Planning to use these clamps to repair the broken bolts.
https://www.amazon.com/3mirrors-Manifold-Universal-Compatible-Silverado/dp/B087N7KWB4/ref=d_pd_di_sccai_cn_sccl_2_3/144-3857527-0201307?pd_rd_w=2PNqq&content-id=amzn1.sym.e13de93e-5518-4644-8e6b-4ee5f2e0b062&pf_rd_p=e13de93e-5518-4644-8e6b-4ee5f2e0b062&pf_rd_r=XYG949R4W0SKDBXQRYPS&pd_rd_wg=55uJQ&pd_rd_r=f5969e71-2400-4e43-ab68-48c2bc87abc0&pd_rd_i=B087NCP2C3&th=1
What do you Guys think