O2 Sensor connector

[EHS911]

Louie: PM sent from me.

[scarceller]

If you snip the green wire on the stock OEM harness be aware that it is a shielded wire. Be certain you do not somehow short the shield to the center conductor. I had a car where someone had tried to fix this wire and they soldered the shield to the center O2 signal line. It took over 2 days to figure this out and it totally screwed up the mixture since it tricked the DME into thinking the mixture was always lean and the end result was the DME trying to richen the mixture! What a pain to figure out this over rich condition!

[scarceller]

Originally Posted by don gilbert

and you cant use solder for any conn. on the 02 wire, it affects the milli volts that travels that wire.

I don't agree with this statement? You can solder if done properly. Also consider that within the DME the O2 sensor signal travels through several (10+) soldered connections without any issue, adding just one more will not change things. A soldered connection will be better than a mechanically connected terminal.

[Louie85]

I agree with Sal, if you look closely at the end connector it's actually soldered.

[scarceller]

Very nice job on this part. IMHO: I would simply wire this new part by:
1- cutting the stock OEM green wire.
2- Remove and discard the old connector.
3- Cut back the shield about 1/2" and shrink tube it.
4- Solder a round spade to the center black 'O2 Signal' line within the green wire.
5- Attach to new plug.

Once again nice job.

[DRACO A5OG]

Originally Posted by scarceller

Very nice job on this part. IMHO: I would simply wire this new part by:
1- cutting the stock OEM green wire.
2- Remove and discard the old connector.
3- Cut back the shield about 1/2" and shrink tube it.
4- Solder a round spade to the center black 'O2 Signal' line within the green wire.
5- Attach to new plug.

Once again nice job.

Thank yiu Dr Sal , I still love my BMW/Buick metal injectors take care, Jim

[marktodo]

louie, i need one of those, i have a current thread running 3.2 won't start. One of the issues is a broke O sensor. you can send me your info to [ i'll send paypal or check
thanks
mark

[gamin]

My son installed this piece on his 85 Carrera. Easy install and problems with running SOLVED.

[marktodo]

We just got it to run by pulling an injector plug and manually grounding it. It's definaty electrical

[BE911SC]

Originally Posted by marktodo

louie, i need one of those, i have a current thread running 3.2 won't start. One of the issues is a broke O sensor. thanks
mark

PM him. I don't think he's on here as often as some of us are!

[marktodo]

Thanks Louie got back to me could you remove my email as i can't edit it
Thanks
mark

[BE911SC]

Originally Posted by marktodo

Thanks Louie got back to me could you remove my email as i can't edit it
Thanks
mark

Done.

[marktodo]

Louis, i too seem dumb as a rock. It looks like the pictures puts yours in series with the old one. My old one is severed. the car is in the upholstry shop right now so I haven't been able to compare pictures on this thread to it yet.
mark

[Louie85]

Mark,

You just need the most inner wire, the other is just shielding. Here's some information from Sal. Hope this help.

Originally Posted by scarceller View Post
Very nice job on this part. IMHO: I would simply wire this new part by:
1- cutting the stock OEM green wire.
2- Remove and discard the old connector.
3- Cut back the shield about 1/2" and shrink tube it.
4- Solder a round spade to the center black 'O2 Signal' line within the green wire.
5- Attach to new plug.

Once again nice job.

[asianimages]

Hi louise
Do you still have extra piece that I can buy from you? If yes then How much and How do I send you the payment?
Thanks

[spuggy]

Originally Posted by don gilbert

and you cant use solder for any conn. on the 02 wire, it affects the milli volts that travels that wire.

+1 for Don - for the first part of his statement.

To be precise, the sensor needs a reference oxygen source, and the electrode is internally open to atmosphere on one side so it can obtain it. This oxygen actually travels down the braided copper connector wire.

See p14:

http://wbo2.com/lsu/oxygen13-17.pdf

It certainly doesn't need much oxygen - but that's why anything that prevents or restricts free flow of oxygen along the wire to the sensor - like soldering and/or heatshrinking the connectors, or blobbing silicon on them for "weatherproofing" - is really not a spiffy idea.

Bosch oxygen sensor installation document specifically states (second bolded bullet point on the first page) :

Do NOT solder wires. Soldering wires will lead to early sensor failure.

http://www.boschautoparts.com/BAP_Technical_Resources%2fOxygen%20Sensors%2fO2Ins tallGDWEB09.pdf


This part has been around since Bosch invented it in 1982. Still amazed this isn't common knowledge.

[DaveMcKenz]

I read the above documents. There are a number of reasons not to solder automotive wires in certain applications. If you look at their universal O2 sensor kit, they cut the wires and splice on the OE connector with Posi-lock connectors. These are very nice connectors.
Do you guys really think the O2 sensor sucks air in along the length of the wire for its reference material (like Fernando Valenzuela breathing through his eyes?) ? I think the air is exposed to the reference electrode at the sensor itself. I also think the solder comment is because soldering fine wires causes a fatigue issue which can lead to breakage when exposed to vibration. Posi-lock tolerate this much better. That's why they talk about early failure in the above document, not malfunction or inaccuracy.
Anyway, that's how I understood it, and I may be completely wrong.
Good luck,
Dave

[spuggy]

Originally Posted by DaveMcKenz

If you look at their universal O2 sensor kit, they cut the wires and splice on the OE connector with Posi-lock connectors. These are very nice connectors.

Yeh, I noticed that. I found Posi-lock completely by accident at a FLAPS about 8 years ago and used them for a stereo install. They really are very good, and I've been using them ever since.

Nice to see Bosch seem to have the same opinion.

Originally Posted by DaveMcKenz

Do you guys really think the O2 sensor sucks air in along the length of the wire for its reference material

I can't speak for anyone else, but I do.

Do a search on this forum (especially the 944 side) for FR Wilks. Don't know if he's posted recently, but used to be fairly active when I ran a 944 - long time ago now.

Then read his website, and see if you think he knows what he's talking about. (guy has re-engineered and sells PROMs for the 944 Motronic, both for more power and the "shudder fix" that afflicts some ageing 944's - he owns several of these, heh).

His website probably contains the most information freely available on the web for the Bosche Motronics and associated sensors. But it's 944-centric, although much of the information is applicable to other brands/models, naturally.

Based on his instructions, I socketed a buddy's Series 1 944 (24 pin) Motoronic to 28 pin so we could use the Wilks shudder-fix PROM. Worked a treat, issue solved never to return (buddy was then sorry he'd not opted for the PowerPROM, but that's another story, heh).

In my opinion, it's pretty obvious Mr. Wilks has been involved in embedded microcontroller applications for many years and knows his way around ICE's and disassemblers, as well as early automotive engine management systems.

He says on his website, (copyright date of 1999) Oxygen Sensor - Lambda, right under the table of Bosch replacement part #'s:

Do Not Solder O2 Sensor Wires!

Use wire crimps or Posi-LockÒ. The orignil factor Porsche O2- sensor breathed from the bottom of the sensor. In the dirt, the grease and the heat. All the latest BOSCH O2 sensors are air tight. The O2-sensor must have a clean air supply to work, a reference sample. Very little air is needed. Special "Lambda wire" was invented. The O2- sensor breaths down the center of the multi-stranded "Lambda wire" at the connector

Crimp, do not solder. Solder and solder flux will close the air-gaps between the strands of wire and the O2 sensor may malfunction.

Seems pretty convincing to me.

[DaveMcKenz]

OK. I stand corrected. I guess I was thinking aobut the older O2 sensors before special lambda wire was used.
Thanks for the information.
Dave

[Cdnone1]

Will this fit an 82 SC?