I had to return the first one I got because the flange didn't sit flat and stuck out, but I don't remember the brand I used. Is there a brand you should stay away from?Originally Posted by boogieman
I had to return the first one I got because the flange didn't sit flat and stuck out, but I don't remember the brand I used. Is there a brand you should stay away from?
Not only could it be the O2 sensor, but they often do throw a code exactly in that situation (50mph+). O2 seonsors are pretty affordable, so putting in a new one is a good first choice.
Gwen
1985 5-speed window cargo van set up for llama haulin'; 345K ("Trustyvan")
1989 4WD 5-speed DLX; 410K and an odd sense of humor ("Skylervan")
The wire coming off my van that goes to the connector that plugs into the O2 sensor has come off right at the connector
Here is a picture:
https://i.imgur.com/n9NwbOR.jpg
There is no wire on the connector to try and splice in a new wire. Would it be possible to try and salvage the old connector, or where could I buy a new one? Auto parts stores didn't seem to have this connector
Save yourself the hassle and just cut off the other part of the connector and then use a butt connector to join the wires together. Add a piece of heat-shrink tubing onto the wire before connecting the wires together...this will help seal up the connection for extra protection from the elements. That is how the universal o2 sensors are installed. If you are concerned about future replacement of the sensor, you could use a spade style connector for easy disconnecting instead of a butt connector.
Yea, you're right. I wanted to keep everything stock and not have stuff wired in, but it would be a lot easier just hard wiring it. I ended up soldering it in.
I have put a new O2 sensor in and I still get the same error code when going at highway speeds. There are no performance issues that I notice, just the check engine light going off and on at times.
Anything else I can try?
I had that problem with my 86. I replaced the o2 sensor twice and yet that code always came back. Next I swapped in a spare ECU and the code still came back. Since o2 sensor is so close to the ECU, I installed a new wire to the sensor, then cut the old wire off close to the ECU and butt connected the new wire to the ECU harness. Job was easy and only took about 10 minutes. Code never returned. Fuel mileage and power increased a bit as well. That was about 4 years/60k miles ago and van is still running good with no o2 code. Tim
doing some exhaust work, a while back when i replaced my O2 sensor i moved it from further down the pipe to the boss directly on the exhaust manifold...van has been running fine, but i will be having the exhaust redone from the manifold back and was wondering if this position is ok or i should replace the bung further down the pipe...are any of you running the O2 directly in the manifold?
The 87 -89 AT 2WD/4WD Vans have the upstream(just one on the 87) 02 sensor further down on the pipe as shown. 88-89 have the upstream and down stream heated sensors 4 and 2 wire respectively) For some reason on the 84-87 van with MT the 02 sensor is mounted on the exhaust manifold . 84-86 Vans MT and AT have the 02 mounted on the exhaust manifold also
So I think you are fine to move it down
actually i want to keep it in the manifold if theres no bad reason to leave it...my collector pipe has seen better days and theres not much meat after the 02 bung for welding new pipe, so i was gonna have the exhaust guy start in front of the.bung..i guess i can add one later if issues arise..
I've run both in the manifold and after on my 87 MT 4wd. I like in the manifold best. It allows the unheated o2 to heat up faster, and stay hot longer during idle. Other than the fact that it is more difficult to replace I have experienced no issues running the o2 in the maifold.
With the turbo I run a heated o2 pretty far back in the pipe now. I tapped the factory manifold blank to run an exhaust gas temp probe.
O2 bungs are cheap and easy for a muffler shop to install. You can order a bung and plug and have it welded in when you do the exhaust. That way you have options later on.
I should mention, I use the threaded style rather than the two bolt. They are cheaper and don't leak. There are two bolt to threaded adapters too.
Hi There, New member here. Been using the search function and familiarizing myself with this wonderful forum and our peculiar vans. Thanks in advance for the help.
Recent problem encountered:
I noticed that my Ox sensor was disconnected, however I did not get any codes when I jumped the check engine connector. I got the normal single blink every three seconds indicating all is well. Any ideas as to why a disconnected ox sensor would not throw a CEL code?
The second part to this story: The ox sensor wire that was broken was on the ECU side of the connector. I crimped a female spade on the wire and plugged it onto the male connector that is attached to the OX sensor. My question: is this just a single wire running from ox sensor to ECU or is there a ground connection made by the mesh wire shield?
84/85 has a single wire.
It's common for the 1st gen vans to fail to throw an O2 sensor code even when the O2 sensor is not working, including when the wire is broken (been there). I don't know the reason; I only know it is so.
Gwen
1985 5-speed window cargo van set up for llama haulin'; 345K ("Trustyvan")
1989 4WD 5-speed DLX; 410K and an odd sense of humor ("Skylervan")
the 2nd gen Van 86-87 also has a single wire with only 1 oxygen sensor. The 88-89 had (2) 02 sensors; the heated 02 sensors that were 4 wires for the upstream sensor and 2 wires for the downstream sensor
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