Stinger87
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I will check harbor freight or rent a fuel pressure tester from auto zone. Something I was thinking earlier, I traced the old fuel pump to a 91-95 fuel pump and I have no clue about the old regulator because the springs are totally different. The old regulator had a heavy duty spring and the new regulatory was a very easily compressed spring. Today when I installed the new regulator I used the old regulator spring and it ran like hell and was pouring fuel even with the injector unplugged. I installed the new spring with the new regulator and it ran better but I didn't test to unplug the injector which I will do in the morning. In earlier posts I mentioned none of the sensors worked either but that I think is because I had so much fuel pressure that the sensors could not cause the engine to cut off because of the fuel air and spark ratio. I will post again tomorrow with some more info about all this. Attached are the new and old springs for the regulator. The old spring Is the large one and the new one is the small one which seemed to help with the fuel pressure. The second photo is the black soot that blew out the back.
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changed the fuel pressure regulator spring and fired up the jeep and it seems like it was running rough but better so i checked the spray pattern and it was spraying and it had a drip too so i pulled the injector out to clean it with carb cleaner. Cleaned it up and just did what i could to clean and install it. Fired up the jeep and it was running good so i started cleaning up my tools and then i reved the engine a little about 2-3k rpms and then it stalled and wont fire back up. When you crank the engine white smoke comes out of the intake. Gonna let it sit outside in time out for a while to think about its actions.... ill do some more research later and see what i can figure out. One more thing alot of black soot blew out of the tail pipe too and covered the side walk.
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Good afternoon, Thanks for the holiday wishes and i too hope you and everyone had a good time during the holiday. Today i installed the new fuel pressure regulator and the jeep runs but it sounds like its getting to much fuel. Im not sure if something went up and is holding the injector open or not but i can actually unplug the injector while the jeep is running and the jeep runs better..... I didnt do to much digging into it today other than the new fuel pressure regulator and tbi gasket then fired it up. Alot of smoke came out of the tail pipe and the engine was rocking pretty hard like it was missing but it just looks like way to much fuel is spraying. And im not sure why the injector still works when unplugged.
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I didn't flush the tank because it is less than a year old and I don't really have the resources to do so where I currently live (apartment). I am sure there is some gunk in there but I hope this will do for now. I got the new pump and pump sock on. New fuel filter and a new regulator and tbi gasket coming here soon. I probably won't have another update until after thanksgiving but I'll keep you posted once I get everything in.
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Alright so here is what I got. Took the tbi off the and the regulator is wrecked. The regulator has a bubble and tiny rip in it. There was also a little debre in the regulator bowl. Hopefully with the new regulator it should be good getting tired of replacing the regulator haha. I took some pictures for everyone to see and I'll load the picture of the gunked up fuel pump
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could contamination have jacked up my fuel pressure reg? Once i installed the new pump and saw the sock was not attached i replaced the filter as well....
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I just cross referenced the two numbers and the pump for the 89 is the one that i got from Napa. I even cross referenced the Chrysler number for the 91-93 to see if the same pump came up and a different one did come up. A different pump did come up so as long is Napa is correct on their number then i do have the correct pump for a 89 TBI. Something happened to make the jeep run like this all of a sudden because Friday after work it was running terrible too and the engine sounds about the same as it does now. Only difference is i didn't open the tbi cap to see the amount of fuel that it was using on Friday. I am not sure if i am having a complete ECM/ECU failure of some sort. The emission shop that i took it to did say that the jeep was going in and out of Open closed loop erratically and they couldn't pin point the issue. They said it was dumping about 5x the normal amount of fuel and only going into closed loop for about 3 seconds and then right back into open. Right now it is running so rich that it floods the motor and will not allow it to start until the fuel in the intake evaporates. I have changed every sensor on the jeep except the oil pressure sensor. I have never had this many issues with any vehicle and i have been a mechanic for about 7 years now (heavy equipment so i guess this doesn't really help my cause haha). Back to the fuel pump, i dropped the tank and took the old pump out and the sock was not attached to it and it was laying at the bottom of the tank. Also the old pump had so much gunk and grim clogged up in it i swore the new pump would fix it but it didn't. One other thing that i will fix in the morning and i just thought of is the fuel tank vent line was just dangling before i dropped that tank so i don't know if that is the culprit or not. I know it is supposed to be linked to the evap canister but i will find the loose hose and hook it up in the morning and retest everything. Something that still doesnt make sense is how none of my sensor have any affect on how the jeep runs now. MAP, MAT, CTS, TPS i can have them all unplugged and it just runs like it does even if they are plugged in.
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Installed the new fuel pump this morning and fired the jeep up. It ran but barely. I don't have a fuel pressure tester but the i took the tbi cap off and looked in the bowl and the injector was spraying so much fuel. Also black soot was coming out the back kind of looked like a diesel truck. It sounded like it was missing really bad too so i shut it down. inspected the butterfly valve and opened it up and the intake had a puddle of fuel in there. I am not sure if it is in limp mode because none of the sensors determine how it runs. If it is running and i unplug the map sensor it used to shut the jeep down now it no longer does this. I took the spark plugs out and they were black and wet so i let them dry and cleaned them off. Now the jeep doesn't run at all unless i wait about 45 minutes after it running. This little guy is turning into a nightmare. Probably taking it to a garage this week......
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Haha so the jeep drove good this morning and then this afternoon it was running like hell. Attempted to drive it home since I only live about 5 miles away and got outside of work and it died. Cranked it over a couple times and still no start. Called a tow truck and waited for it to come but every 5 minutes I would crank it to test my luck. After about 40 minutes it did finally start and I hauled ass home it was bucking and jerking like crazy. I figured it is the fuel pump since it is pretty much the only thing in the fuel system that hasn't been changed. Should get the pump tomorrow and I'll drop the tank and go from there.
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As of right now i have not had any issues with the jeep (knock on wood). It is idling at 1000rpms and drives good and doesnt bog down when stopping at red lights or stop signs.
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Alright so i just picked up my new fuel pressure regulator from advanced auto because they had the fastest delivery rate. I took the tbi off to get to the regulator and installed the new FPR. Reassembled everything but i look the tbi cover off so i could see the spray pattern and check for excess or not enough fuel. Crack the motor over and the engine spikes to 3k rpms so i get out to look at it and fuel was spraying out of the bowl. I shut the engine down cleaned up the fuel and figured i would try again. Cracked the engine over but it didn't start. Assuming the engine was flooded i figured it was a bad regulator so i took it all apart again and installed the old one. Once i re installed everything i cracked the engine over again and it fires up and runs perfect......I am drawing a blank because the idling issue is gone and it doesn't sputter. I did check the ohms for my new IAT/MAT sensor and at operating temp my sensor was at 1780 ohms which doesn't seem in spec but as of right now its running with no issues. That may change in the morning when i drive it to work and put a load on the engine. as of right now i am running out of ideas
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Here is a good post about this same issue if anyone was wanting to read up some more on it. http://www.jeepforum.com/forum/f12/87-90-mat-sensor-discontinued-part-fix-walkthrough-how-1549148/
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I am having all of those sensors crossed and i cannot find a single one because they are discontinued.
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So I have the new mat sensor and the ohms readings are very low 10.5 ohms but the jeep is idling good. I am going to use this since it is running better then with a broken sensor in it. I will post a better part number once I cross ref another. I tried to add some picks of the new sensor wires up just have to see if they load. Tomorrow I will put the new pressure reg in it, I had to order another since my wife tossed the other one on accident haha. Also on my drive to work tomorrow I will get the engine nice and warm and see if the sensor keeps the engine running good or it if goes way out of spec. More updates tomorrow!
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Yes sir, i changed the PCV valve on my oil change which was about 200 miles ago. As for vacuum leaks i havnt not found any. While the motor was cool i used carb cleaner and sprayed the hoses to see if the rpm would fluctuate but i didnt get any findings. When i reinstall my fuel pressure reg i will replace the 4 vacuum lines on the TBI. I didnt get to do any more troubleshooting lastnight but i will pick up my sensor and see what i can do tonight
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I currently have a MAT for a 91 on order which will be in tomorrow morning so i will compare the ohms readings and post them on here tomorrow. In addition if the ohms readings are the same.Here is the current part number that i will be trying tomorrow that is the closes match to what i am currently running MPE TS5014TB this here is a Napa prolink number and i am not 100% sure that it will work but i will verify tomorrow and keep you updated. All of the crossover number that you posted Moses i could not find anywhere. I am not sure if it is because its not the full part number but i even tried to interchange those part number through several other sites and i couldn't find anything. Anyway tomorrow i will have an update. Thanks again for the help its much appreciated.
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Alright so i did some troubleshooting. In my previous post i said that this all happened after i installed the new fuel pressure regulator. I left out one key detail. I ordered this regulator from Rockauto and the spring that they gave me did not have enough resistance on it but i used it anyway thinking it should work since it's new and they sent it to me. Wrong.... it actually flooded the engine with so much fuel and back fired out of the intake with this happening i'm almost certain that damaged the MAT sensor causing the rough idle. My issue now is actually locating the MAT for a 1989 and Chrysler is saying that it has been discontinued. I have found a similar sensor for a 91 the only difference is the way it is wired up but it still is a two wire. Right now i am looking at getting the sensor for the 91 and buying a few snap together connectors and making my own harness for it.
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Good morning sir, I will double check the MAT sensor tonight and log my readings. The TPS sensor when i losen it and rotate it i still get zero signal out of it so i am assuming that is part of my issue. The idle speed actuator i do not know how to adjust unless it is just turning the threaded part of it. Today i drove the jeep to work with the bad fuel pressure regulator in it and it drives decent. Enough power through all gears but sputters a little bit around 1500-2000 rpms. At red lights and stop signs the motor will idle down to 1000 rpms and sounds good but then drops to about 500, it does not stall but it does sound rough. Even sometimes at 1000 rpms the tac and engine jump around and this idling issue just started happening once i put the new fuel pressure reg in it. I ensured the TBI was clean made sure that the 4 vacuum lines were in good shape no cuts or anything. I also replaced the TBI gasket to make a good seal. Last thing i noticed was unplugging any of my sensors did not effect the way the vehicle ran anymore such as MAP sensor MAT. The MAP sensor used to shut the vehicle down but it doesnt effect it anymore.
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Good evening...Another thing i was curious about is the thermostat on my jeep. From my understanding it should have a 195 in it. My gauge at times tells me different because it seems like it is running around 165-175 on an average sometimes the temp will spike to where it looks close 200 and that is when it runs the best . I am guessing this would cause an issue with the computer and not allowing the engine to go into a closed loop to properly function properly. I was actually looking to swap that out to make sure that it is running correctly at 195. i was wondering if anyone had anything to add to this? Another thing is for my previous comment about my rough idle. I did a ohms test on my intake air temp sensor and cold it was close to 2000 ohms. I do not know the specs for this but to me it sounds out of range. While the engine was at operating temp or to what the gauge says about 165-175 the ohms rating was around 1500. If anyone had any insight of this or any more knowledge about the IAT that would be great. Thanks again for any help and hopefully this all can help someone later on. Josh
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Good afternoon Moses...Thanks for the quick reply, and I forgot to add that I did replace the egr valve even though my old one was good. I replaced because I got a good deal on it and it looked ancient. I had the jeep running really well but I did notice that a few days after I changed the fuel pressure regulator that is when I had the idling issue. The regulator removed my issue of the loss of power but now it just feels as if it were about to stall during stop lights and when in neutral idling. I installed the old fuel pressure regulator and the hard idle and loss of power issue are there. Tomorrow I will throw the new regulator in and now I just have to sort out the idling issue. I had a local exhaust shop test my o2 sensor and inspect my exhaust for back pressure and to see if my cat was plugged but they both passed. The only things I can think would be my idle speed control which does work. When I start the jeep up my rpms go to about 2000 and then idle around 1000 but then seems the engine starts to sputter like it's not getting enough fuel. As soon as I give it some throttle the engine wakes up and runs smooth. Thanks again with the quick reply. Josh
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Moses, your website has been extremely useful for me while working on my 1989 Jeep YJ Wrangler 2.5L TBI engine. I have used it for testing just about everything on my jeep. I have replaced several items because of extremely high emissions. Today was the 4th pass through the test, and I finally passed my emissions test. I have replaced the ignition coil, ignition control module, spark plugs, cap and rotor and set the base timing, map sensor (because it did not hold vacuum), coolant temp sensor and my fuel injector. With all of that, my emissions finally were within spec. I am still having a loss of power issue with my jeep, and the only thing that helps is when I run Seafoam through the vacuum lines. It helps for about 2 days and then the same issue. Any ideas would be extremely helpful. One possible clue: The wide open throttle switch is in-op (cannot locate the part), and my throttle position sensor does not put out a signal if this helps any. Stinger87 (Josh)
