911 mystery component in engine compartment

[84-911-SN/WB]

Hi, 1st post!

I'm getting a 911 from a friend and am sorting out the common "no start" issue after a 2-year storage (have spark, and after some testing I've identified the problem as a faulty Reference Sensor.

My question is can someone please help me identify this component in the engine compartment directly below the fuel filter. What is it for and what does it do? There's an unconnected wire dangling near it that logically seems to connect onto the end nipple of the component but it's not connected - is it necessary for something important and needs to be connected, or can it remain unconnected?

Thanks for any help!

[mo-mon]

Welcome! You'll get more help if you post a picture of the component you are referring to.

[84-911-SN/WB]

thanks - I attached 2 photos but they did not appear - I'll try again...

[yelcab1]

O2 sensor connector on the engine side. There should be an O2 sensor wire somewhere close by.

[84-911-SN/WB]

thanks a lot yelcab1.

there is a wire nearby and I did connect it, but it felt very tight and I had to press very hard to get it on, which made me think it doesn't go there, so I pulled it off, and in doing so, the center nipple on the component feels like it broke and pulled out, and some of the plastic around it broke too - so, I'll probably need to replace it. Would you happen to have a part number?

And could it cause a 'no-start' problem?

thanks again for your help!

[RWebb]

likely not causing that problem

go to Porsche's website and find the PET for your year

what year is your year anyway?

... and - go thru the stuff in my Sig.

[84-911-SN/WB]

thanks RWebb.

I looked thru my Bentley Service Manual and could not find that component. O2 sensors are typically mounted in the exhaust - and the part I'm asking about is bolted to a bracket on the left side of the body engine compartment under the fuel filter, and looks more like a coil.

I'll do more research as you suggested because I'm still uncertain.

the car is an '84 Carrera 911 coupe (slant nose wide body)

[30westrob]

As yelcab1 stated above, O2 sensor connector. The O2 sensor wire plugs into that connector.
Rob

[ryanjboutin]

Originally Posted by RWebb

- go thru the stuff in my Sig.

This makes dollars and sense.

[FrankM_]

It is the connector for the 84-85 O2 sensor, there should be a green wire.

Kroon sells the fixed connector part : https://www.kroonwireharnesses.com/porsche-911/porsche-911-1984?product_id=745&limit=50

As ‘O2 sensor replacement connector’ but in your case it seems the connector attached to the O2 sensor itself is damaged.
I had to get a new O2 sensor with the original connector from the Porsche dealer. If you are not worried about originality, you can use a bosch universal narrowband o2 and change the existing connector to the new one that is often included in the package.


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[84-911-SN/WB]

thanks to everyone for your great help!

another question...

the car has a Steve Wong performance chip installed - I'm wondering if the O2 sensor was intentionally disconnected to make the chip work more effectively. I'll have to research this, but in the mean time, does anyone know if this is the case, or if the O2 sensor should never be disconnected.

[Lyle O]

Speaking from experience, when I had a SW chip, he (Steve Wong) specifically instructed me to keep the O2 sensor plugged in. My car is an '87. YMMV.

[84-911-SN/WB]

thanks Lyle O!

as I was thinking, that the O2 sensor is obviously needed for proper fuel metering.

I found more technical info on the O2 sensor in this post by 'spuggy'...

O2 Sensor connector

and found mention of another forum member 'Louie85' who makes O2 connectors as another option, but after reading the technical details of the above post, I'm wondering if the materials used have to be of specific chemical makeup that's calibrated to accurately read oxygen concentration, and if replacement O2 connectors take that into consideration...

O2 Sensor connector

thanks again to all of you for your help!