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Recently replaced the upstream O2 sensor in my 97 TJ (with the help of JPNinPA & Greg92JeepXJ). Ran great for a few days. Now it's been getting colder at night, it seems like the TJ developed a studder in all gears until it gets warm (op temp 210*) when I try to run in the morning. Any suggestions

So I called all the salvage yards in the area and none of them have any TJs. Of course :razz: I did find these at about the best price after crawling web.... thoughts or suggestions? Replacement Fenders

Issue has been corrected!!! UPDATE: Changed out the sensor last night with the new NTK. Fired up the jeep this morning and left for work as I do with my truck. The jeep didn't hesitate, spit, or sputter as it did before. There was a slight "miss" in second gear but that could have been me since...

Thanks for the info guys. Guess that will be a spring project

Everyone wave hi to the troll ^^^^^^ :spank:

The fenders weren't much to look at on the jeep (one of the reasons I got it so cheap). Both are rusted through on the tops and the drivers side is busted up due to the PO tried to go crawling in a stock TJ. The PO did "try" to patch it but it looks like it was filled with paper mâché. Trying to...

update: got the new NTK O2 sensor in today. Going out to the garage shortly to pull the other one out and put this one in. I figured I'd unhook the battery while I install to reset the PCM. Update to follow shortly

Sorry for the delayed wait everyone. Currently still waiting for the new NTK sensor to arrive

I contacted the seller on EBay and advised them the SMP sensor does not work with the Wrangler. They said due to the issue with the sensor, they will ship me a NTK sensor to replace the SMP (plus a mailing label to return the SMP)......... update to come

BTW, the brand of O2 sensor I purchased is a SMP

UPDATE: Ran the Jeep to work this morning. The CEL was on due to the O2 being unhooked. The jeep was running at high RMPs (1500-2000) just at idle in Neutral. I stopped the jeep and reset the DTC just to clear the CEL. Started the jeep back up (O2 still unhooked) and the jeep ran fine until the...

http://i256.photobucket.com/albums/hh190/leonbond/IMG_0627_zpse41a1f3f.jpg http://i256.photobucket.com/albums/hh190/leonbond/IMG_0626_zps576f3dda.jpg Revised

update: ran the jeep on the interstate. It did not buck, hesitate, or sputter out of the parking lot, pulling on to the main road or merging onto the interstate. It is running rich as I can smell it when I let off the throttle and when stopped the RPM is around 1100. The O2 sensor i put in in...

getting ready to head out of work. I'll post an update regarding the drive home

Update: I just unplugged the upstream O2 sensor and took the jeep for a spin around the parking lot. The jeep was still warm, but was hovering around 140*. The Fuel System data was showing as OPEN. When I fired up the Jeep, the CEL did not come on and it remained in the Open Loop. When I took...

JPN, I'll go back over the bolts to ensure they are tight. I didn't realize there was an order of tightening for those. after the manifold gasket change, there wa sa slight bucking when I first started and ran the jeep. At this point, the full symptoms have returned just as they were prior to...

ENGINE WARM-UP MODE This is the Open Loop mode. During engine warmup, the powertrain control module (PCM) receives inputs from: † Battery voltage † Crankshaft position sensor (REPLACED) † Engine coolant temperature sensor † Intake manifold air temperature sensor † Manifold absolute pressure...

I still have the scan tool. I just need to research what data it will stream while driving. I got the sensor off of Ebay (cross referenced the part number, not application type). It was like the rest of the sensors I have replaced already (thought it was the issue). I still have the original...

From what I could find, the one I replaced is the Crankshaft Position Sensor. Does it also have a Cam Shaft Position Sensor?

Greg, thanks again for the input and walking through this. I replaced the Crankshaft sensor (the one on drivers sideI believe it was located on the bell of the transmission or in about there). I'll have to check the Haynes manual to see where the CPS is located. I originally thought I was doing...