Wiring Bosch 15704 Oxygen Sensor in S4 Esprit?
Discussion
I know this part will work, I'm just trying to figure out which wire goes where? Any help on the colors by someone who has done it before?
The o2 sensor needs replacing and I've found this one, but I can't seem to find a resource as to match up the oem colors on the plug with the bosch clors on the sensor...
Thanks as always,
Rob
this thing may be running well by the new year!
The o2 sensor needs replacing and I've found this one, but I can't seem to find a resource as to match up the oem colors on the plug with the bosch clors on the sensor...
Thanks as always,
Rob
this thing may be running well by the new year!
Interesting, I was speaking to PNM about this only yesterday. He buys in genuine Lotus ones and I asked him about patten ones or universal? He said that virtually all cars that came in with running problems that was down to the oxygen sensor, owners had put these universal ones on and had failed. They had considered themselves at one point to supply these because the genuine ones were so expensive. They have decided not to down this route.
It would be beneficial if owners have tried these patten or universal oxygen sensors for their feedback to this group.
Dave Walters
It would be beneficial if owners have tried these patten or universal oxygen sensors for their feedback to this group.
Dave Walters
I think someone is wanting to keep some business. O2 sensors come in different styles, that is, heated, non-heated, etc. but if you replace yours with one of the same type it will work. Lotus does not make O2 sensors, but Bosch and NGK do. Remember, a GM ECU is reading the output and doesn't care what is attached. As long as long as the output is between 0 to 1.1V (most of them) depending upon O2 in the exhaust stream, then it is happy. My car, 90SE, has a NGK (I think, it has been awhile) sensor attached and has been running great for well over 10k miles since installation. I know of one other I worked on that we put a Bosch in, works fine too.
Ron
Ron
The colors (colours) on that web site should be the ones on the sensor. The key to matching up a 4 wire sensor is to look at the original and look at the replacement and figger what goes where.
On the sensor, two wires should be identical (same color). These are the heater and it doesn't matter which way it is hooked up.
One wire should be shielded, that is, have a braid over the center conductor like coax (which is what it is). This is your signal.
The remaining wire is the supply.
Dr.Hess
On the sensor, two wires should be identical (same color). These are the heater and it doesn't matter which way it is hooked up.
One wire should be shielded, that is, have a braid over the center conductor like coax (which is what it is). This is your signal.
The remaining wire is the supply.
Dr.Hess
Got it wired up, but wierd things happen.
Whenever it was unplugged (or the old one melted through), the car ran like a dream. Now, with it plugged in, it runs fine for about 10 seconds then sputters and dies. Giving it gas will keep it running, but it runs really rough and wants to kill.
There's also a vaccuum line open (tiny hole, connected to what look like two blue wiring harnesses bloted to the rear of the engine compartment) that if I plug, the engine jumps to about 4k rpm... hmm.
::scratches head and cries::
Whenever it was unplugged (or the old one melted through), the car ran like a dream. Now, with it plugged in, it runs fine for about 10 seconds then sputters and dies. Giving it gas will keep it running, but it runs really rough and wants to kill.
There's also a vaccuum line open (tiny hole, connected to what look like two blue wiring harnesses bloted to the rear of the engine compartment) that if I plug, the engine jumps to about 4k rpm... hmm.
::scratches head and cries::
4 wire sensors don't have a ground in Toyota applications. Looks like they have plenty of grounds in Lotus applications.
According to the schematic, you should have a green wire going to the O2 sensor that is switched, which should go to one of the two same-color wires, the coax going to the ECM (both the shield and the center signal) and the other two wires which should be one of the same color wires and the last one are grounded.
Did you reset the ECM after all this fiddling? You should do that.
Dr.Hess
>> Edited by Dr.Hess on Friday 24th December 18:31
According to the schematic, you should have a green wire going to the O2 sensor that is switched, which should go to one of the two same-color wires, the coax going to the ECM (both the shield and the center signal) and the other two wires which should be one of the same color wires and the last one are grounded.
Did you reset the ECM after all this fiddling? You should do that.
Dr.Hess
>> Edited by Dr.Hess on Friday 24th December 18:31
YOU DA MAN!!!
That did it. I had it hooked up right, for some reason after reading the esprit fact file it talked about one wire grounding on the sensor body and I must have gotten confused.
Disconnected the battery about ten minutes, fired it back up and she runs like a champ!
now if I can only find these ground points and this bad connection...
Thanks everyone!
That did it. I had it hooked up right, for some reason after reading the esprit fact file it talked about one wire grounding on the sensor body and I must have gotten confused.
Disconnected the battery about ten minutes, fired it back up and she runs like a champ!
now if I can only find these ground points and this bad connection...
Thanks everyone!
Dave don't take my comment about keeping business too literally. I'm sure those guys are good, I don't know who they are or where they are located. I've just seen some vendors pass off "Lotus Only" specific things for high $$$ when there is no such thing in many cases, as many of you guys know already.
There are O2 sensors that work, no doubt since I've used them and so have others above. I don't know the part number of the one in my car but the way it got there was me taking the Lotus unit to the parts counter, getting the man there to help me sort through the available ones, and matching up one with the same connector. Took about 15 minutes, cost was about $65 as I remember. Helps to have a friendly part man, but most of the ones in the US in the Pep Boys, Advance, etc. are bored and giving them something like this to do is better than finding a brake caliper for a Honda Civic.
Once the snow clears away and I drive mine later this week I'll take a peek at it and see if there are any numbers on it that are apparent. I'll post it here. Dr. Hess might have a part number on his list too, did anyone check?
Ron
There are O2 sensors that work, no doubt since I've used them and so have others above. I don't know the part number of the one in my car but the way it got there was me taking the Lotus unit to the parts counter, getting the man there to help me sort through the available ones, and matching up one with the same connector. Took about 15 minutes, cost was about $65 as I remember. Helps to have a friendly part man, but most of the ones in the US in the Pep Boys, Advance, etc. are bored and giving them something like this to do is better than finding a brake caliper for a Honda Civic.
Once the snow clears away and I drive mine later this week I'll take a peek at it and see if there are any numbers on it that are apparent. I'll post it here. Dr. Hess might have a part number on his list too, did anyone check?
Ron
I have:
Description Manufacturer Part_number Comments Source Confirmed
Oxygen Sensor Bosch 0 258 003 022 Exact replacement Kenneth Golden No
Remember that confirmed=Yes means that I have held the part in my hand, compared it to the original and am using it on my car. A rather high standard for confirmed, but one I feel is lacking in the Esprit community and I adopted after getting the wrong fuel filter referenced from a left coast site.
Dr.Hess
Description Manufacturer Part_number Comments Source Confirmed
Oxygen Sensor Bosch 0 258 003 022 Exact replacement Kenneth Golden No
Remember that confirmed=Yes means that I have held the part in my hand, compared it to the original and am using it on my car. A rather high standard for confirmed, but one I feel is lacking in the Esprit community and I adopted after getting the wrong fuel filter referenced from a left coast site.
Dr.Hess
Whats going on with your sensor after 10 seconds is that the ECM is not getting any readings, so it is reverting to a Default Setting.
Now my problem...I shortened the cable to the O2 Sensor on an 86 S4 and now I'm trying to find out what wires go to what Pins at the Harness Connector to the Stock 02 Sensor.
The choices are on the ECM Side:
2 Blacks
1 Green
1 Brown/Blue (Shielded)
The Choice from the O2 Sensor:
2 Brown
1 Purple
1 White
Regards,
Daryl
Now my problem...I shortened the cable to the O2 Sensor on an 86 S4 and now I'm trying to find out what wires go to what Pins at the Harness Connector to the Stock 02 Sensor.
The choices are on the ECM Side:
2 Blacks
1 Green
1 Brown/Blue (Shielded)
The Choice from the O2 Sensor:
2 Brown
1 Purple
1 White
Regards,
Daryl
Just as an FYI:
There is a calabration in the code of the mem-cal for the "cross over" point of the o2 sensor.
The sensor has an output of about .1-1.1 volts,but due to different installations, different grounding, AND different sensors it is necessary to be able to tweek the ECM to the installation. The factory parts and the aftermarket ones are supposed to be the same, but the quality control of the OEM parts is what effects the price.
The ECM only reads:
Below the cross over = lean
Above the cross over = rich
Therefore, it is entierly possible that replacing a sensor with one that is not the same could have an adverse effect on the engines performance. With that in mind an improperly replaced connector or splice can effect it as well, along with a poor ground.
There is a calabration in the code of the mem-cal for the "cross over" point of the o2 sensor.
The sensor has an output of about .1-1.1 volts,but due to different installations, different grounding, AND different sensors it is necessary to be able to tweek the ECM to the installation. The factory parts and the aftermarket ones are supposed to be the same, but the quality control of the OEM parts is what effects the price.
The ECM only reads:
Below the cross over = lean
Above the cross over = rich
Therefore, it is entierly possible that replacing a sensor with one that is not the same could have an adverse effect on the engines performance. With that in mind an improperly replaced connector or splice can effect it as well, along with a poor ground.
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