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Julio

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  1. Julio
    Hello Moses, Finally I ended up buying both and installing both. I was not able to obtain 13 PSI with none of them. Not the 18-20 I was getting originaly but slightly above 16. From what I have learned in this process it seems it is not fuel pressure related. When I crank the engine and it first start it, the RPM are normal for the first 5 seconds. Then somehow a fixed 1000 rpms are commanded. You can tell from the iddle motor that is spinning in order to adjust that iddle. In the process of replacing the fuel pump and the fuel sender unit my fuel gauge droped to zero regardless of the fuel quantity. Just an observation, both pumps are louder than the one I had before. Thanks again and please let me know your thoughts on the matter.
  2. Julio
    Thanks again Moses for your kind and fast reply. I don t remember the fuel capacity of my tank. Is there any way of knowing it by means of the VIN number. (2J4FY29E0KJxxxxx). I did find the Crown pump 83502995 but it is only the puel pump. I think the best would be to change te whole fuel sending unit. There is another item on eBay that seems to be compatible: "Fuel Level Sending Unit For 1987-1990 Jeep Wrangler 2.5L 4 Cyl 1989 1988 Crown" link: https://www.ebay.com/itm/295255257536 manufacturer part number does not match those you gave me: 83502990. Also, as you mentioned. I will check the return line for obstructions before buying it. Thanks again!!!
  3. Julio
    Thanks a lot Moses!!! After a couple of months and various thread sizes error on the purchase of the adaptor I finally got the correct one. Your guess was absolutely right. I was not able to test it with the "T" method. The fuel pressure is higher than it should be: between 18-20 PSi. I will check the return line. In case the fuel pump is incorrect and wrongly replaced in the course of the las 30 years. Do you know the correct part number? Thanks again.
  4. Julio
    Hello Moses. I finally received the pressure test kit. Unfortunately, none of the fitting included fit into the "pressure test port plug". I had to remove the fuel supply tube and attach it there, hence, I was not able to test it with the engine running. Nevertheless, the readings of the fuel pump where normal. Without removing the TBI I jumped into the other possibility, the “fuel pressure regulator”. I noticed the illustration you sent me depict a “pressure regulator screw”. Mine in the contrary seems to have a flushed or slim bottom. It there any protective cap underneath there? Thanks again!
  5. Julio started following 2.5L TBI Jeep YJ Wrangler Running Rich and Won't Idle and Jeep YJ Wrangler 2.5L TBI Troubleshooting
  6. Julio
    This forum is very helpfull. I'm having similar problems. I was searching on how to test the pressure and adjust the pressure regulator and HERE IT IS!
  7. Julio
    Thanks again Moses. I remember the pressure regulator because I replaced it when I bought a kit to rebuild/refresh the TBI. All the gaskets and rings where there and that triangular shaped membrane was the pressure regulator. Do I need a special gaude to check the fuel pressure or a 40 USD tool from amazon is enough? How is that adjustment performed on the pressure regulator? I do recall something like a sloted screw in the midle.
  8. Julio
    Thanks a lot Moses for your kind, complete and fast reply. The catalytic converter is not clogged yet. I replaced a couple of month ago to rule out that theory. I have routed and checked the vacuum lines several times. I believe they are ok at this point. I will explore the fuel pressure theory. It sound very solid. Either the pressure regulator, the fuel pump or the return line. That's uncharted territory for me. Where is the pressure regulator? and how it can be adjusted? Do you know about any tool to check the pressure? The new tach is for the 2.5 L TBI. Thanks again Moses, have a great weekend!
  9. Julio
    Thanks a lot for your message. I dont remember the numbers exactly. Mixture was too rich and the jeep was spitting gas and black particles from the escape. This was May 2021. Eversince I have changed everithing that I have read and watched on forums and videos. (TPS, IAC, MAP Sensor, 02 Sensor, TBI gaskets and Coolant T Sensor, distributor cap, sparks and wires, air and fuel filter, even a new TACH. The las thing I ve replaced was the injector.) Nothing happens, iddles evenly at 1.000. Like it was programed to do that. Besides that the jeep runs great. I tried what I read in one of your posts about disconecting the egr solenoid and watch for a reaction. It makes a difference. I have looked around the vacum lines not thoroughly. But havent fount any parent leak using wd40 and cigarete smoke. There is one line missing on the font axle. The one that goes into the dashboard line. Also, the in the same 4wd harness there is a blue cable (I believe is vent) plugged with an iron ball. IMG_9048.HEIC IMG_9047.HEIC IMG_9045.HEIC
  10. Julio
    I have a very similar issue with my 2.5 TBI YJ. Mine idles at 1000 fixed rpm. Smooth. Changed every possible sensor including a NOS tach and a new CAT. I'm unable to pass the emission test. Altough the tach is showing a steady 1000 rpm, the SNAPON scanner shows 730 rpm.
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