328 wire connection

Can someone please identify this wire connection located behind the air box on my 1986 328? The one connector has 2 white wires. thanks

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I believe that could be the 2-pin electric heater connector for the O2 sensor with one wire being +12V and the other wire ground when the engine/fuel pump is running (the nearby 1-pin "tannish/orangy" connector with the green wire is the single wire signal output from the O2 sensor). What are the wire insulation colors on the other side of the 2-pin connector?

 

Nothing to add. The Oracle is here.

 

I did some additional tracing and it looks like a 3 wire O2 with the green wire connecting at a separate connector (you can see the green wire right of the open connectors in the picture). This all started when I discovered the frequency valve is not buzzing. Onward and downward.... Thanks

 

The FV really wouldn't know if the O2 sensor was working correctly or not (but it could do some weird things if the O2 sensor isn't working correctly). However, if your FV is completely dead when cranking or running the engine (i.e., whenever the fuel pump is running -- so you can just unplug the safety switch and turn the key "on" to run the fuel pump and the FV should "buzz") = most likely your Protection Relay system isn't working -- so check that. Could be a bad connection, a blown Protection Relay 10A fuse on the Protection Relay (and if blown could indicate an over-voltage alternator condition), or a bad Protection Relay itself -- under the rear trunk floor panel on the RH side IIRC.

 

No buzz at all. Protection relay fuse is good. Connections look OK. How can I test the actual Protection Relay?

 

Found a writeup on how to test the Relay. The Search feature is your friend. Thanks

 

Out of all the very many cars I have encountered with a non op frequency valve I have never seen a blown fuse. 90+% of the time it is a bad relay.

 

OK -- give a shout if you need anything more.

 

+1 -- Sort of a case where the extra precaution was worse than having the disease (for the overall population as a whole). Rather than .01% of all cars have an alternator go crazy and blow up the K-Jetronic Lambda ECU, they opted to add an (over-voltage) Protection Relay and have most of the cars need help when that fails.

 

Relay tests bad. I just ordered a new one. Never a dull moment with old cars...(my XKE's fuel pump just died to add insult to injury)...

 

Replaced the frequency valve relay and now the car runs great.