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Found 18 results

  1. I'm trying to nail this down but unfortunately without any success. Jeep has around 27-9 psi pressure at rail at idle and vacuum connected. With disconnected vacuum it is around 36psi. I think this is main issue why my fuel trim numbers are 5-8%. Things done so far: Fuel filter has some 3k miles on it. Bypassed fuel filter and pressure is still the same. Cleaned and tested fuel injectors. All tested good. Checked vacuum lines Fuel tank had to be dropped for skid replacement, so I replaced fuel pump at the same time /w new strainer Replaced fuel pressure regulator
  2. Greetings, Have a 1989 YJ with the 2.5l TBI. Have had a sporadic idle, stall problem. Verified fuel delivery and injector performance, tested and/or replaced all sensors and IAC motor. Cleaned throttle body, checked for vacuum leaks. Kept looking over at the coil/icm assembly, but thought "no, just replaced those not too long ago." Long story short, tested the coil - badly out of spec. Changed out both coil and icm and finally (slow learner here) checked voltage entering coil. Constant 14 =/- volts at startup and run. Checked with my daughter who drives the vehicle and she confirm
  3. Hi, I've been hunting and chasing my tail to get some kind of throttle response from my wrangler above 45 MPH. I know these are not very powerful to start but I feel like what I'm experiencing is abnormal. Anywhere above about 45MPH when throttle is given There is little or no response from the engine. I have gone through the tuning and troubleshooting, replaced numerous things and adjusted what is able to be adjusted to the best of my understanding. Most recently I put a new cylinder head on due to a cracked web between valves on cylinder 4. I was so sure this was going to solve my
  4. On the passenger side engine compartment on my 89 yj 2.5 liter there is some diagnostic plug in connectors. which one is the connector for the isa motor control? Which one is D-1 and D-2? How are each individual holes in connectors numbered ( 1-2-3-4-5-6 etc>)?
  5. Hello to All.... I wish to thank all the members and especially you Mr. Ludell for all the time spent on our endless problems.... I have reviewed all the posts that might pertain to my problem and do not wish to ask a question that can be easily answered by simple review... My YJ has had an.. "on again / off again" problem that may not be related to this exact problem but it just seems to have never been 100 % or maybe even 80%... The current problem started on an outing in the woods ..drove fine climbing, downhill and 4wd.. coming back the engine began to act like it was
  6. So this is a wierd one, I've looked and looked on the Internet and can't figure it out. My jeep wrangler runs and drives just fine but there is no cel on start up. I know there should be code because I have no 02 sensors hooked up. I want to know if there is more though. Any help would be appreciated
  7. Hello all. I have a 1990 jeep wrangler with a 2.5l 4cyl engine. The engine is young, only 4 or 5 thousand miles on it. However the rest of the drive train has 264,000 miles on it. Anyway the saga continues after adding new rear leaf springs. After the replacement on the way home this noise happens only when I let off the throttle. I think the ride hight is higher than what the stock was. But that should still not cause this noise Right? My question is what the stock springs should be just to verify I have the right springs and and what the awful sounds coming from the transfer case. Transfer c
  8. Hi Guys! I've scoured these pages the last couple days, but can't find anything that matches my specific dilemma. I have a 1990 Wrangler w/ 150k miles on it, recent acquisition by my future son-in-law. It was running relatively fine, but it quit suddenly on a recent trip. It started cutting out when hitting bumps, then finally quit altogether. After dragging it home, hitting the forums, swapping a few parts, following all the sensor tests and wrapping my head around this TBI setup, I am afraid I have a partially dead ECU. -All ignition parts replaced- Ignition Module, Coil, Wire
  9. I have a 1988 YJ 2.5L and am I right to assume that it has the AX5 tranny? If so, is there a kit available to convert from the internal clutch slave cylinder to an external? Is this something I should do? I believe the slave is working properly but the bearing is definitely making noise. I have less that 800 miles on the new (slave/throw-out) that was purchased at a local box store (oreilly's) and it's already making noises. Any suggestions or opinions are greatly appreciated. Steve
  10. I put a new 2.5l into the jeep and it only has 400 miles. It was running great till suddenly the issues popped up again. I hooked the scanner up and saw that the short term trim was ridiculously high. Its reference point at idle is 128 and its running at 180. The long term trim is at 109. the injector pulse is 2.0. The o2 sensor was reading no higher than 500mv.
  11. Moses and @biggman100 @BadDriver4x4 thanks for taking the time (a full year ago!) to respond to my inquiry. A little update: I found a mechanic out in Suffolk County, NY who is supposedly the local Jeep expert. I drove the hour to visit, nice guy, knows his stuff, but I think he was a bit un-enthused about me supplying all of my own parts, and he has a full schedule - and he knows that an picky, educated customer with a rusty Jeep is a bad value proposition! He never got back to me with a quote. Well, arm be damned, I decided to take my time and do the work myself. Some parts:
  12. I have attached a few pictures of this transmission I have but I don't know where its from I need help identifying this transmission the only thing I can identify here is the transfer case because it has the sticker in the back its an NP "new process" 249 J This is a manual 4wd transmission I believe its an ax15 transmission but please give me your input as i'm not sure any help is appreciated one more thing from the shape of the bell housing I don't think this came of a Jeep possibly AMC or other but thanks again
  13. Moses, I made a video of the Snap-on MT2500 scan tool readings maybe this will help in the RPM issue. Here is some history of the 89 Jeep Wrangler YJ 2.5L. I have what i call a hiccup when idling or driving every once in awhile. The engine is usually warm to operation temp and will hesitate or act like it dies ( rpm drop at an idle to 200 rpm or so) while idling in the drive way. Sometimes will die but will start right back up and there is days when it dose this hiccup while i am going 25 or 45 mph or what ever speed and has no rhyme or reason. Here is what I have replace or trouble sho
  14. Hi im from the Netherlands,. (So sorry for my bad English) and got a problem with a 89 jeep wrangler The jeep gots a 4,2 6cilinder with I guess a 32rh transmission the transmission pump has eating the converter ;) so the converter was rebuild, en a another pump mount, but I've changes also the clutch plates and seals after a everything was assembled : the car drives 1&2 gears perfect but the 3rd gear late, and. Cold very late. The reverse was slipping, so I've put everything out (again) and checks the front clutch, I've thought the inner seal of the
  15. 1990 jeep wrangler with the 2.5l 4cyl engine. it was rebuilt about 10 years ago its got 100,000 ish on the engine. About 4 years ago it started making this noise. Some people thought it was a diesel engine. oil pressure test confirms somethings up. The needle was some what jumpy. It only does it when the engine is warmed up. I suspect its a lifter issue or a spark knock. Any ideas?
  16. Hey All, I have had my jeep for around a year, the only issue I have had is a bad master cylinder that had to be replaced, but since then no problems as a daily driver. Over the past few weeks she has suddenly started stalling on me and I wanted to get an opinion on what the symptoms point to so I can try to pinpoint the issue. So far I have tried replacing the ignition coil, and that did not fix the overall problem. Here are the symptoms: 1987 Jeep Wrangler Sport YJ 2.5 TBI. Jeep has started to stall at stop signs and stop lights, but only after getting warmed up (15 minutes
  17. I own a 1995 Jeep Wrangler YJ 4.0L just got it reassembled after repainting I'm having 1 issue it's starting hard I replaced the iac valve no change when it starts firing it only sounds like a few cylinders until it warms up i have to keep my foot on the throttle slightly it sometimes back fires but once it's warm it runs perfectly fine. I don't have a vapor canister in it cause it got lost could that be my issue?
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