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-   -   o2 sencor help!!!!!!!!!!!!!!!!!!!!!!!!!!! (https://www.rx7club.com/2nd-generation-specific-1986-1992-17/o2-sencor-help-610985/)

touge_monster 01-04-07 03:21 PM
o2 sencor help!!!!!!!!!!!!!!!!!!!!!!!!!!!
 
i was hooking up my air fuel ratio gauge and when i was splicing the wire into the o2 sencor the wire from the harness broke off the plug

i was wondering i copuld make my own conector or if there is a resistor in it or something

am i going to have to buy a new plug?

spot_skater 01-04-07 03:42 PM
Solder connectors on. There is no resistor or anything.

James

EDIT: If Mort is correct, then crimp. Properly crimped connectors are very strong, as well.

mort2002 01-04-07 03:46 PM
or you could just get like an insulated bullet connector and put the male on the o2 sensor and the female on your harness, and crimp them on. from everything i have read NEVER SOLDER ON YOUR OS SENSOR WIRE!! it adds resistance!

touge_monster 01-04-07 03:50 PM
thanks. i was freeking out cuz i have to be to work in 45 min and i didnt know if i could just make a new plug.

rx7 FC TII 01-04-07 05:59 PM
i suggest you crimp it.....

TII-aholic 01-04-07 06:07 PM
Originally Posted by touge_monster
thanks. i was freeking out cuz i have to be to work in 45 min and i didnt know if i could just make a new plug.
its not like u cant drive without an O2 sensor....

rx7 FC TII 01-04-07 07:52 PM
Originally Posted by TII-aholic
its not like u cant drive without an O2 sensor....
ya i actually drove mine for about 2 1/2 months with mine disconnected......it ran like shit and i got horrible milage.....then i realized that the wire had been cut......

Snrub 01-04-07 10:11 PM
My O2 sensor wire goes independantly through the firewall to the ECU where it is soldered on. I've had no ill effects. Theoretically the wire should be shielded, but mine is not.

Aaron Cake 01-05-07 09:14 AM
Originally Posted by touge_monster
i was hooking up my air fuel ratio gauge and when i was splicing the wire into the o2 sencor the wire from the harness broke off the plug
i was wondering i copuld make my own conector or if there is a resistor in it or something
am i going to have to buy a new plug?
The stock harness is shielded so when you install the new connector, make sure you are connecting it to the actual signal wire and not the outer shield.

hybridphil 01-05-07 09:55 AM
My 02 sensor wire broke right at the plug. I tried soldering it on but there was nothing really for it to catch to. (Prior to reading this post). I can't crimp it as there is really no wire coming out of the oxygen sensor. I also think that because of the proximity of the 02 sensor to the exhaust manifold, a butt connector would melt. My fix was drilling a tiny screw into where the wire of the 02 sensor comes out with the wire going to the harness wrapped around the screw. I suppose this works but I don't know to what extent. is there any way to check that my 02 sensor is actually sending a signal through the wire. Some of the wire is slightly exposed, so would I be able to check with a voltmeter for voltage in the wire, or would that not work? Sorry to hijack the thread...just felt it was relevant.

spot_skater 01-05-07 10:24 AM
Originally Posted by hybridphil
My 02 sensor wire broke right at the plug. I tried soldering it on but there was nothing really for it to catch to. (Prior to reading this post). I can't crimp it as there is really no wire coming out of the oxygen sensor. I also think that because of the proximity of the 02 sensor to the exhaust manifold, a butt connector would melt. My fix was drilling a tiny screw into where the wire of the 02 sensor comes out with the wire going to the harness wrapped around the screw. I suppose this works but I don't know to what extent. is there any way to check that my 02 sensor is actually sending a signal through the wire. Some of the wire is slightly exposed, so would I be able to check with a voltmeter for voltage in the wire, or would that not work? Sorry to hijack the thread...just felt it was relevant.
It would work. You should see a cycling .1-.9v at idle.

RotaMan99 01-05-07 11:53 AM
from everything i have read NEVER SOLDER ON YOUR OS SENSOR WIRE!! it adds resistance!
Where did you hear this? If anything a crimped wire will add resistance. Soldered wire is a direct connection with no brakes or gaps. Unlike a crimped connection. Either way. crimped or soldered, the resistance should be the same roughly the same depending on how long the new o2 sensor wire is.

RotaMan99 01-05-07 11:57 AM
My 02 sensor wire broke right at the plug. I tried soldering it on but there was nothing really for it to catch to. (Prior to reading this post). I can't crimp it as there is really no wire coming out of the oxygen sensor. I also think that because of the proximity of the 02 sensor to the exhaust manifold, a butt connector would melt. My fix was drilling a tiny screw into where the wire of the 02 sensor comes out with the wire going to the harness wrapped around the screw. I suppose this works but I don't know to what extent. is there any way to check that my 02 sensor is actually sending a signal through the wire. Some of the wire is slightly exposed, so would I be able to check with a voltmeter for voltage in the wire, or would that not work? Sorry to hijack the thread...just felt it was relevant.
I can't see this working. Unless im picturing it wrong in my head, if you put the screw where I think you did which is at the top of the o2 sensor in the hole, then the screw would thread on to the housing of the o2 sensor correct? If so would't this just be a complete ground, not a resistance to ground? Correct me if im wrong.

Aaron Cake 01-05-07 12:47 PM
Originally Posted by RotaMan99
Where did you hear this? If anything a crimped wire will add resistance. Soldered wire is a direct connection with no brakes or gaps. Unlike a crimped connection. Either way. crimped or soldered, the resistance should be the same roughly the same depending on how long the new o2 sensor wire is.
Technically you should not solder on the O2 sensor wire because the sensor breaths through the wire. If you solder, you will fill empty space with flux and melted rubber, thus preventing the sensor from breathing (one side of the O2 sensor element is exposed to atmospheric, the other side to exhaust...this forms a battery who's voltage depends on the difference in oxygen between the two sides...). That's why crimps are used.

I don't understand the problem the original poster is having though. If there is not enough room to crimp or solder, just strip some more insulation back. If the wire broke off right at the sensor, replace it.

touge_monster 01-05-07 01:16 PM
----------0000 00000 -------------
^ ^
wire to o2 wire from car
sensor broken at plug

and it is broken so close that i can attach it back to the stock plug si i was wondering if insulated male and pemale connectors would work or if the stock plug is anything special?

Aaron Cake 01-05-07 04:02 PM
There's nothing special about the stock plug however as I mentioned, make sure you are not crimping to the shield.


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