fraggle

You don't want to solder it.

That's why the universal connector is so wierd. Most people don't have crimp pliers to do it properly.

I thought the "no solder" stuff was bunk too until I looked into it further. Hit up google.

You do need a very good crimp on it. Mine is running that way and works great. When I had the whacky bosch connector it ran like crap.

Good luck! Hope the oem one works for you. I'm happy with my universal.

Mongo

I have heard of electrical fires as a result of soldering O2 sensors to wiring harnesses rather than crimping or splicing. I will try crimping with butt splices this weekend. Right now it's raining here. At least the tarp I threw over the car will keep the water infiltration out this time, which is also why I am going into the CE panel to inspect for water damage there. This season has not been a good one to the 928 so far.

Lizard928

I had not heard of the no solder before. But then again, I refuse to use the universals because there is a reason they are so cheap. They dont work!

Mongo

They do work, when they are wired right.

I don't blame you for refusing to use an universal and gladly take your advice on never using one again.

Mrmerlin

you can buy a new Bosch O2 sensor here for 77.00
http://jbrlsr.com/?aid=5336118867&bi...dapting-2.html

if you solder or crimp the the wires then the airway for the wire will be damaged, this had been covered before.
Andy before you do any more testing you need to put the correct parts into your car, otherwise you like the rest of us are chasing our tails.
When you cut corners sometimes these are the problems thats occur

dprantl

https://rennlist.com/forums/7128851-post4.html
https://rennlist.com/forums/7128886-post6.html

Dan
'91 928GT S/C 475hp/460lb.ft

Landseer

deleted.

Mongo, I hope you get it sorted out the rest of the way with the sensor!

Larry928GTS

My question is why would you bother to put in a new O2 sensor of any kind without checking that the one you have in there now is actually bad? Put a volt meter on it and see what it's doing.

If you don't already have one, you can get a cheap volt meter for less than 1/10th the cost of even a cheap new O2 sensor. Even a cheap meter like that should tell you whether your current sensor is bad, and there are a LOT of other places on a 928 that it'll help you find other problems in the future.

People spend a lot of money just replacing parts, sometimes apparently at random, when trying to solve a problem. It's a whole lot cheaper to test and only replace bad parts than to try to just keep replacing stuff until you eventually find the part that caused the problem. If you're going to take that approach, send me all of those old parts you replaced with new ones that didn't fix the problem.

Landseer

They actually require a waveform read to diagnose.

Because they were original equipment on two of the cars, unknown but appearing original on the other two cars. They have a recommended service life of 60,000 miles pre-OBD II according to Bosch. Replacment is part of my renovation scheme on these sitters that I fix.

Similar with Temp II, Temp I and more recently CPS. Temp/time for sure also on the 16V USA. They have a history of failure, best to replace initially. TPS I can disassemble and clean/repair I've found.

They also get caliper kits whether they need it or not, new brake lines, and new sealing rubber.


The more I learn, though, the more diagnosing I do. Lots more learning to go.

Larry928GTS

While seeing the waveform is nice, I've diagnosed more than one bad 928 O2 sensor in a few minutes with a $2 Harbor Freight multimeter.

Mongo

Bad or not bad, I'll take the advice given to me in the posts above and continue troubleshooting in the area of the O2 loop. I'm so close to getting this car to run damn good that it's too late to stop now.

fraggle

I didn't use waterproof (and airproof) crimps on mine. All the connections are inside the car. No worries about the airway in the wire here!

Mrmerlin

the universal connector doesnt crimp the wire IIRC

Mongo

You are correct Merlin. It is some sort of connector where you insert and 'screw' the wire in. And, I specifically remember having a hard time making sure the wires screwed in right as I remember seeing strands of copper fall out or get crunched. Perhaps that IS THE PROBLEM.

fraggle

I'll bet beers at SITM it's the O2 sensor connection... but you gotta be there to collect.