Comavalanche Posted September 27, 2017 Share Posted September 27, 2017 Every time I start my truck, once it goes into closed loop, the short term fuel trim immediately maxes out. It starts to stumble and almost stalls then recovers by going back to open loop. It does this two or three times before finally staying in closed loop. Sometimes it just stays in open loop the whole drive. I replaced my O2 sensor which fixed the problem but it failed after a week or so. I get terrible gas mileage so I would love to figure out why my O2 sensor failed so quickly... Link to comment Share on other sites More sharing options...
87MJTIM Posted September 27, 2017 Share Posted September 27, 2017 You may want to purchase a Renix Engine Monitor (REM) from Nickintime on facebook. https://www.facebook.com/search/top/?q=nickintimefilms He sells these units that will give you real time info on how the engine is running. One reading is the O2 sensor. It may be operating correctly, but something else is causing it to run in open loop. This is an issue I'm having. My O2 bounces around a lot but mostly stays at or below 2.5.Yet, I'm running in open loop most of the time. Link to comment Share on other sites More sharing options...
Jeep Driver Posted September 27, 2017 Share Posted September 27, 2017 You didn't replace with NTK, did you? Link to comment Share on other sites More sharing options...
Comavalanche Posted September 27, 2017 Author Share Posted September 27, 2017 25 minutes ago, 87MJTIM said: You may want to purchase a Renix Engine Monitor (REM) from Nickintime on facebook. https://www.facebook.com/search/top/?q=nickintimefilms He sells these units that will give you real time info on how the engine is running. One reading is the O2 sensor. It may be operating correctly, but something else is causing it to run in open loop. This is an issue I'm having. My O2 bounces around a lot but mostly stays at or below 2.5.Yet, I'm running in open loop most of the time. I have an REM that’s how I can see it just dumps fuel when it goes into closed loop. Sometimes the o2 voltage doesn’t budge at all. Link to comment Share on other sites More sharing options...
Comavalanche Posted September 27, 2017 Author Share Posted September 27, 2017 17 minutes ago, Jeep Driver said: You didn't replace with NTK, did you? I got a Bosch off rock auto Link to comment Share on other sites More sharing options...
Jeep Driver Posted September 27, 2017 Share Posted September 27, 2017 Just now, Comavalanche said: I got a Bosch off rock auto NTK. Link to comment Share on other sites More sharing options...
Ωhm Posted September 28, 2017 Share Posted September 28, 2017 Swap out the Oxygen Sensor Heater Relay with a known good one. No voltage to O2/O2 heater will simulate a lean condition. Something is telling the ECU your running lean. Also check for low fuel pressure, dirty injectors, both cause a lean condition. Link to comment Share on other sites More sharing options...
Comavalanche Posted September 28, 2017 Author Share Posted September 28, 2017 7 minutes ago, Ωhm said: Swap out the Oxygen Sensor Heater Relay with a known good one. No voltage to O2/O2 heater will simulate a lean condition. Something is telling the ECU your running lean. Also check for low fuel pressure, dirty injectors, both cause a lean condition. Thanks I’ll mess around after work tomorrow to see if the relay is shot. Link to comment Share on other sites More sharing options...
cruiser54 Posted September 28, 2017 Share Posted September 28, 2017 12 hours ago, Jeep Driver said: NTK. This^^. Link to comment Share on other sites More sharing options...
Comavalanche Posted September 29, 2017 Author Share Posted September 29, 2017 11 hours ago, cruiser54 said: This^^. Alright just ordered an NTK sensor. Will report back on Tuesday. Link to comment Share on other sites More sharing options...
Comavalanche Posted October 1, 2017 Author Share Posted October 1, 2017 Just put in the new NTK sensor. On the first start up the truck went into closed loop with no problems! I’m going to monitor it closely going to and from work this week to see if it starts doing what the Bosch did. Thanks guys! Link to comment Share on other sites More sharing options...
Minuit Posted October 1, 2017 Share Posted October 1, 2017 NTK aren't perfect either. Just had to replace mine after about 10,000 miles. It got stuck high. Link to comment Share on other sites More sharing options...
RandyA Posted May 18, 2019 Share Posted May 18, 2019 Did the ntk o2 sensor work out okay? What was the part number? Link to comment Share on other sites More sharing options...
saveevryjp1998 Posted May 20, 2019 Share Posted May 20, 2019 On 5/18/2019 at 1:50 PM, RandyA said: Did the ntk o2 sensor work out okay? What was the part number? This is an old thread. I believe Rock Auto sells the proper Renix NTK assuming your looking for an 88 4.0 it's Link to comment Share on other sites More sharing options...
RandyA Posted May 26, 2019 Share Posted May 26, 2019 Did the ntk o2 sensor work out okay? What was the part number? On 5/19/2019 at 7:04 PM, saveevryjp1998 said: This is an old thread. I believe Rock Auto sells the proper Renix NTK assuming your looking for an 88 4.0 it's Old threads help with issue of today. 90 cherokee. 87-90 uae same parts. Thanks for the info. It helps. Link to comment Share on other sites More sharing options...
cody4359 Posted May 28, 2019 Share Posted May 28, 2019 True true. My heep was stumbling like crazy and had two 02 sensor codes. Fond a thread from 8 years ago that pointed me in the right direction. I do t know if the older systems are the same but I merely had a blow 02 sensor fuse. Saved me close t0 $150 for the time being. Link to comment Share on other sites More sharing options...
SuperSwede Posted February 10, 2020 Share Posted February 10, 2020 On 10/1/2017 at 6:27 PM, Minuit said: NTK aren't perfect either. Just had to replace mine after about 10,000 miles. It got stuck high. I noticed the same thing, got two NTK 23553 with failure, one after a week or so, and the second now after only 16000 km Got a Bosch earlier not much better and one unbranded still same malfunction What was the original brand and type/number for a O2 sensor in a 89 Comanche? Looking for quality replacement Link to comment Share on other sites More sharing options...
fiatslug87 Posted February 10, 2020 Share Posted February 10, 2020 The OEM part number is 04713639 (maybe without the 0???) Link to comment Share on other sites More sharing options...
eaglescout526 Posted February 10, 2020 Share Posted February 10, 2020 1 minute ago, fiatslug87 said: The OEM part number is 04713639 (maybe without the 0???) With or without its still the same Chrysler number. Link to comment Share on other sites More sharing options...
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