llhat Posted February 5 Share Posted February 5 Thank you Ohm! i interpret as 'normal driving'. recent battery cable change, i did not really note any ill effects, but continuing to put miles on it when possible. Link to comment Share on other sites More sharing options...
AnotherOldJeepGuy Posted February 5 Share Posted February 5 Thanks for the second on the O2S and the FSM doc. The Jeep is running better today. I have had it out on several short drives and for the most part the rough running is not there although it has returned momentarily a couple times on acceleration from a stop. It does still stall when I come to a stop unless I maintain he rpm manually. If I gradually work the rpms down I can get to the point where I am no longer engaging the accelerator, and once I get to that point it doesn't then stall, it is only on the quick rpm reduction where that happens. There is a diagnostic connector of some kind. Clearly not OBD2. Pretty sure the local auto parts store won't be able to connect to theses. What does it take to get to this diag info? Link to comment Share on other sites More sharing options...
89 MJ Posted February 5 Share Posted February 5 9 minutes ago, AnotherOldJeepGuy said: There is a diagnostic connector of some kind. Clearly not OBD2. Pretty sure the local auto parts store won't be able to connect to theses. What does it take to get to this diag info? A Renix Engine Monitor (REM) by @NickInTimeFilms Here’s a link for them, not sure if they’re in stock or not right now though. https://nickintimedesign.com Link to comment Share on other sites More sharing options...
pizzaman09 Posted February 5 Share Posted February 5 1 minute ago, 89 MJ said: A Renix Engine Monitor (REM) by @NickInTimeFilms Here’s a link for them, not sure if they’re in stock or not right now though. https://nickintimedesign.com There are also some older school systems and some fancy Snap On stuff that can read the diagnostics ports, but definitely the Renix Engine Monitor is worth its weight in gold. Buy one and you will be delighted by your new found diagnostics capabilities for Renix. Theoretically you can also read voltages off of the diagnostics ports but the REM makes all of that way simpler and reports things out in easy to understand terms. Link to comment Share on other sites More sharing options...
AnotherOldJeepGuy Posted February 6 Share Posted February 6 On 2/5/2025 at 4:28 AM, Ωhm said: Your symptom does sound like a faulty O2 sensor. @pizzaman09 good suggestion. I looked at Rock Auto for the O2 Sensor. and I see the information below. This forum conversation seems to be talking about a single sensor, is there more than one I need to replace in my quest to" stop the stall"? Link to comment Share on other sites More sharing options...
89 MJ Posted February 6 Share Posted February 6 25 minutes ago, AnotherOldJeepGuy said: I looked at Rock Auto for the O2 Sensor. and I see the information below. This forum conversation seems to be talking about a single sensor, is there more than one I need to replace in my quest to" stop the stall"? Nope, our Jeeps just have the one sensor. It’s common for vehicles to have one sensor for each bank if they are a V engine, and/or have at least one sensor before and one after the cat. Link to comment Share on other sites More sharing options...
AnotherOldJeepGuy Posted February 6 Share Posted February 6 14 minutes ago, 89 MJ said: Nope, our Jeeps just have the one sensor. Great! These are not outrageous, but they are not exactly cheap either Link to comment Share on other sites More sharing options...
AnotherOldJeepGuy Posted February 6 Share Posted February 6 On 2/4/2025 at 4:20 PM, Eagle_SX4 said: All of the top manifold bolts can be reached with a box end wrench. All of the lower bolts can be tightened from the top. You will need a socket and some extensions to clear the intake manifold. I drove up on my ramps and looked underneath, and besides the two circled in the pick below that I already got from the top, I could see only two more that I did not get from the top, but there were some obstacles to look around. Is 2 additional not including the ends bolts (circled in blue below) the correct number or are there more down there I just could not see past the obstructions? It did look to me that one might be able to get these from the top, if one had x-ray vision and could see from the top where to aim the socket! Or if one had a helper that could look from underneath and direct one, but I am not sure I'd ever manage to make contact from the top working by myself! But with some time and most likely a few choice comments along the way I might be able to get to them from underneath. Although I did spray water today while it was ramped up so that I could see that I was spraying in the right place, and no rpm change, so maybe the bottom ones are not loose anyway. Link to comment Share on other sites More sharing options...
Eagle_SX4 Posted February 7 Share Posted February 7 There are 6 total bolts on the bottom of the manifolds including the ones on the ends. The front 3 are in front of the exhaust tubes and the back 3 are behind the exhaust tubes. Here are some pics. Front Back Link to comment Share on other sites More sharing options...
Eagle_SX4 Posted February 7 Share Posted February 7 Also if you take the air box out it is much easier to get to them from the top. Link to comment Share on other sites More sharing options...
pizzaman09 Posted February 7 Share Posted February 7 I did all of mine on the ground from underneath with a variety of wrenches but primarily a ratcheting box end wrench. They were not easy and I have skinny orangutan arms. I could imagine it being a reasonably easy job if you take out the air box from the top. The air box is fairly easy. Also, check to make sure all 6 are there, I was actually missing a stud completely on the back most one. Link to comment Share on other sites More sharing options...
89 MJ Posted February 7 Share Posted February 7 1 hour ago, pizzaman09 said: I have skinny orangutan arms. I’m stealing this to describe myself Link to comment Share on other sites More sharing options...
AnotherOldJeepGuy Posted February 7 Share Posted February 7 Well I sure could not see that many! It could be that all the crud buildup is hiding some, or could also be missing. I need to put some engine cleaner to work in the area and see if any emerge. Did not think about removing the air box, that sounds helpful. My arms may have some of the same attributes but I think the top approach might work better for me. I'll put this new info to the test and see what I see. Is there anything outer than size I would need to match if I need to replace missing pieces? Thanks Link to comment Share on other sites More sharing options...
AnotherOldJeepGuy Posted February 7 Share Posted February 7 I was able to put eyes on all 6, so making progress and none are missing, so that's good. Link to comment Share on other sites More sharing options...
pizzaman09 Posted February 8 Share Posted February 8 On 2/7/2025 at 8:57 AM, AnotherOldJeepGuy said: Is there anything outer than size I would need to match if I need to replace missing pieces? Just size, I replaced the missing stud and nut on mine with a grade 8, 3/8-16 bolt from the hardware store. Link to comment Share on other sites More sharing options...
AnotherOldJeepGuy Posted February 8 Share Posted February 8 Link to comment Share on other sites More sharing options...
AnotherOldJeepGuy Posted February 13 Share Posted February 13 Got the new O2 Sensor today from Rock Auto. Step 4 has some conditional stuff in there about M18 v M12 sensors and whether or not a "flange" exists. Given the specs, the Thread Diameter of the one I got is 18mm, can I assume that would make it a M18 sensor? I don't see anything in the description that would help me know if there is a "flange" or not. https://www.rockauto.com/en/moreinfo.php?pk=1644114&cc=1181720&pt=5132&jsn=3 Link to comment Share on other sites More sharing options...
AnotherOldJeepGuy Posted February 14 Share Posted February 14 Old O2 sensor out, new O2 sensor in. Stalls exactly the same. Is this another one of those cases where the computer needs to relearn, or is the effect of the new sensor instant? Link to comment Share on other sites More sharing options...
Ωhm Posted February 15 Share Posted February 15 3 hours ago, AnotherOldJeepGuy said: Is this another one of those cases where the computer needs to relearn, or is the effect of the new sensor instant? Bummer on that O2S. Results should have been immediate. Link to comment Share on other sites More sharing options...
fiatslug87 Posted February 15 Share Posted February 15 Do you still have the EGR valve? Have you tested it? https://comancheclub.com/topic/73480-21-–-renix-egr-valve-test/#comment-769327 Procedure from the FSM is in this post. https://comancheclub.com/topic/38225-egr-solenoid-renix/ Link to comment Share on other sites More sharing options...
AnotherOldJeepGuy Posted February 15 Share Posted February 15 2 hours ago, fiatslug87 said: Do you still have the EGR valve? Have you tested it? I do have a part that looks like what is identified as EGR valve in Figure 48 in the second post. I have not tested it. I'll read the instructions a few more times and see if I can make any headway on testing it. I don't have a tachometer, so I'll have to take a wild guess of hitting the 1500 RPM step, and I don't have any kind of vacuum gauge, but I should at least be able to the steps that don't require that piece of equipment. On to fix attempt number, hmm, I think I lost count.... Link to comment Share on other sites More sharing options...
AnotherOldJeepGuy Posted February 15 Share Posted February 15 2 hours ago, Ωhm said: Bummer on that O2S. Results should have been immediate. Yeah, I was hoping to make some improvement here Link to comment Share on other sites More sharing options...
AnotherOldJeepGuy Posted February 16 Share Posted February 16 23 hours ago, fiatslug87 said: Do you still have the EGR valve? Have you tested it? https://comancheclub.com/topic/73480-21-–-renix-egr-valve-test/#comment-769327 Procedure from the FSM is in this post. https://comancheclub.com/topic/38225-egr-solenoid-renix/ @fiatslug87, the part within the blue square in the pic below moved to the right (as orientated in the picture, which is movement away from the engine) when I cranked up the RPM. That looks to me like something more like a shaft that a diaphragm, but, it did move and I didn't see anything else moving. Is this the movement I should be witnessing to pass the Valve Opening Test? If the answer to that question is "Yes", then is this the same thing I should try to move manually when idling to do the Valve Closing Test? Link to comment Share on other sites More sharing options...
AnotherOldJeepGuy Posted February 17 Share Posted February 17 I decided to assume that moving the plunger/shaft piece in the blue square in the pic I posted last time, since I can't see anything that looks like what I would call a "diaphragm", would be how to perform the Valve Closing Test. As soon as I was able to move that piece to the right (away from the intake) the RPM dropped immediately. Since this is the pass criteria for the Valve Closing Test, it would appear that it passes. So, given both the Valve Closing and Valve Opening tests passed, it would appear my EGR valve should not be the issue, at least not according to the link 1 test. Without something to measure vacuum, I have to stop at this point on that part and not do the link 2 test. It's beginning to look like I need to follow my dad's plan. In the 80s he was a big fan of the AMC Pacer (Well was an Eagle fan first but moved on to the Pacer). He had 3.5 Pacers, so that when something wasn't working he could swap parts from one to another to find out what wasn't working. But the key was that at least at some point the 3 fully assembled Pacers did work. The 0.5 one, well that was really just a pile of potential spare parts. Link to comment Share on other sites More sharing options...
89 MJ Posted February 17 Share Posted February 17 How do all of your connectors for various sensors look? Any chance you’re losing connection somewhere? Link to comment Share on other sites More sharing options...
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