UPDATE: NTK O2 sensor 23553 (RENIX)

[87MJTIM]

Pretty steady. It was dropping but just 0.1 v every couple seconds. I left KO for 10 seconds

[Ωhm]

Your wired according to the 88 Elect Manual schematic. That is IGN feed (YEL) to pin 1(30) and FP relay feed to 5(86). Do you have a ballast resistor?

[Ωhm]

15 minutes ago, 87MJTIM said:

The REM shows the O2 sensor moving up and down, but it will stay at or near one reading for long time spans:

This show O2S has slow response time. Should flicker LEAN/RICH at the speed of light.

 

16 minutes ago, 87MJTIM said:

Also, fuel trims will drop below 128.

Less than 128 takes fuel away (decreased INJ PW time). O2 sensor see a RICH condition.

[87MJTIM]

12 minutes ago, Ωhm said:

Your wired according to the 88 Elect Manual schematic. That is IGN feed (YEL) to pin 1(30) and FP relay feed to 5(86). Do you have a ballast resistor?

No. ‘87 didn’t include one 

[Ωhm]

Okay. They had a kit (fuel pump noise) out there where one could add a ballast resistor. This included the O2 heater relay update.

[87MJTIM]

9 minutes ago, Ωhm said:

This show O2S has slow response time. Should flicker LEAN/RICH at the speed of light.

 

Less than 128 takes fuel away (decreased INJ PW time). O2 sensor see a RICH condition.

I will switch the display to show R/L condition 

 Yes, I know it means the ECU reading rich. 

 

Stuck open or leaking FI?

[87MJTIM]

1 minute ago, Ωhm said:

Okay. They had a kit out there where one could add a ballast resistor. This included the O2 heater relay update.

Never installed. Original owner 

[Ωhm]

1 minute ago, 87MJTIM said:

Stuck open or leaking FI?

That a good starting point.

[87MJTIM]

Volvo 746 injectors 

[Ωhm]

39 minutes ago, 87MJTIM said:

Never installed. Original owner 

 

No ballast OK. But I would suggest you swap the wires (1(30) with 5(86)) on your O2 Heater Relay. Currently your O2 heater circuit current flow through your IGN SW (12vdc/6ohms=2amps) with KEY ON. This 2amps is above everything else that flow through the IGN SW. One upon a time, when MS1700 was the tester of choice, vehicle would have failed and the fix was this swap. Also if ballast resistor was installed, part of the instructions was to include this swap. Suggestion only, feel free to ignore.

[87MJTIM]

Was there a TSB for this?  I have the service manuals. 

[Ωhm]

Don't know about TSB number. I.S. 32E is the Fuel Pump Noise number.

[cruiser54]

13 hours ago, Ωhm said:

Don't know about TSB number. I.S. 32E is the Fuel Pump Noise number.

 

 

 

[87MJTIM]

Thx, Cruiser.  My MR277 manual does not have that IS.

[fiatslug87]

Well, I just received a Bosch one. Looks identical to the new NTK: metal body, four wires out of the body and reads 4.5 ohms. I will try it and see but I'm not very hopeful.

 

Edit:

I checked resistance between A&B, 4.5 ohms just like the NTK, ended up just returning it. Interesting that both Bosch and NTK wete made in Spain, they must be from the same manufacture.

[JMO413]

On 7/2/2019 at 3:59 PM, Jeep Driver said:

That's their old catalog picture. The new ones are meal body with 4 wires. I bought multiple Bosch and NGK trying to find ceramic one.

[Jeep Driver]

1 hour ago, JMO413 said:

That's their old catalog picture. The new ones are meal body with 4 wires. I bought multiple Bosch and NGK trying to find ceramic one.

https://www.quadratec.com/products/917222_03.htm

[fiatslug87]

Thanks Jeep Driver, I'll try an OmixAda for the 4.0L.

https://www.cseoffroad.com/1722216.html

[Drahcir495]

6 hours ago, fiatslug87 said:

Thanks Jeep Driver, I'll try an OmixAda for the 4.0L.

https://www.cseoffroad.com/1722216.html

Let me know how that works out. I am getting ready to replace mine too 

[fiatslug87]

Received the OmixAda yesterday, looks identical to the new NTK/Bosch, 4 wires, steel body and resistance is 4.4 just like those two. Not sure if I'm going to try it out or just return it.

[Drahcir495]

Darn it

[SuperSwede]

On 7/3/2019 at 1:36 AM, Ωhm said:

 

No ballast OK. But I would suggest you swap the wires (1(30) with 5(86)) on your O2 Heater Relay. Currently your O2 heater circuit current flow through your IGN SW (12vdc/6ohms=2amps) with KEY ON. This 2amps is above everything else that flow through the IGN SW. One upon a time, when MS1700 was the tester of choice, vehicle would have failed and the fix was this swap. Also if ballast resistor was installed, part of the instructions was to include this swap. Suggestion only, feel free to ignore.

 

This explain the two swapped wires in my truck...found when searching for O2 sensor problems..

[fiatslug87]

Final update, found NOS Mopar sensor, everything runs perfectly.

[Eagle_SX4]

Has anyone tried a GM 3 wire oxygen sensor? I am trying to track down an O2 sensor issue and found that not many people have had luck with the new sensors. I started looking on Rock Auto for a GM vehicle with a 3 wire O2 sensor and found that from 92-94 the 4.3 V6 used a 3 wire sensor with a male weather pack connecter on it. Bosch #13077 or NTK #21003. They are much cheaper than the jeep ones and was wondering if I swapped the connector would it work?

[Salvagedcircuit]

1 hour ago, Eagle_SX4 said:

Has anyone tried a GM 3 wire oxygen sensor? I am trying to track down an O2 sensor issue and found that not many people have had luck with the new sensors. I started looking on Rock Auto for a GM vehicle with a 3 wire O2 sensor and found that from 92-94 the 4.3 V6 used a 3 wire sensor with a male weather pack connecter on it. Bosch #13077 or NTK #21003. They are much cheaper than the jeep ones and was wondering if I swapped the connector would it work?

 

If you don't buy this, I probably should. looks genuine & correct. I don't know why there's grease on the tip but it looks right

https://www.ebay.com/itm/155981924910