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1-17 of 19 Results
  1. YJ Technical Discussion
    Hello everyone, I have an 89 Jeep YJ with the 2.5 TBI. I'm having an issue where it stalls out with no warning. Yesterday I had it idling in the driveway for 3 hours. It was idling nice. Took it out for a 15 minute drive. Right when I pulled back into the driveway, it stalls out. Whenever it...
  2. YJ Technical Discussion
    Hey folks, My 89 4.2 came bought in 2020 with a Howell TBI conversion done in 2013. Trouble is, it runs rich as hell until it's warmed up, and is prone to flooding. It runs like a champ once it's heated up. The fuel consumption still sucks, barely 11mpg on a decent highway drive. Fuel...
  3. YJ Technical Discussion
    Trying to help a buddy get is 1987 YJ back on the road. Jeep has the 2.5 TBI 4 cylinder with the 5 spd. Has fuel at the injector in the throttle body but no spark. Here is what has been checked so far: cleaned up the grounds at the engine block checked ohms between battery grounds at the...
  4. TJ Technical Discussion
    Hey all, I have a 97’ TJ 2.5 that needs a new engine. The only other 2.5 I’ve found that is out of an 87 yj. I was wondering if i can just take the block from that 87 and put all of my 97 goodness on it? Any major differences in the block that would make that a bad idea? Thanks!
  5. YJ Technical Discussion
    The jeep is running rough and has the tendency to stall after the engine is warm. Background. The 1987 jeep wrangler 4.2L has a TBI kit installed - purchased from Performance Fuel Injection Systems (pfisys.com). The installation was done in February 2019 and a round trip from Austin to...
  6. YJ Technical Discussion
    1987 wrangler 2.5 TBI stored for 10 years wont start. I changed fluids, drained fuel and disconected fuel supley tube from throttle body and by turning key had the fuel pump fill about a quart container to get rid of the bad fuel. Starts if I pour a bit of fuel in throttle body then cuts out...
  7. YJ Technical Discussion
    Hi Everyone. First time posting a question. Well i have my first YJ. I had a TJ from 2001-2006 and had to sell it to get something more efficient for commuting. So im finally back in the Jeep life and am rebuilding a 1990 YJ 4cyl. So far i have done all sorts of TLC and fixes. I just put...
  8. YJ Technical Discussion
    so i've recently found out my alternator is pretty much shot. I've been looking around and found a couple 94 amp ones for the yj but they all say *with A/C*. Can i still use this even if i don't have an A/C? link below. also if anyone has any other suggestions on alternators please let me know...
  9. YJ General Discussion
    I have searched everywhere for some TBI upgrades for the 87-90 2.5 and have came up with nothing so I need your help. I need any extra power I can get, within reason. Things I have already done: Electric Fan Swap Flowmaster Exhaust Full Tune-Up Vacuum Lines K&N Air Filter ( Wish I could...
  10. YJ Technical Discussion
    Hey everyone, the lower end on my MPFI 1991 2.5 engine was going out the door so I swapped it with a 1990 TBI engine and swapped the intakes to make it compatible. It's running but unfortunately the distributor isn't cooperating. Apparently the distributors from both engines are set at a...
  11. YJ Technical Discussion
    Does anyone know what has to be done to convert a 2.5 TBI to a MPFI? I have a 91 MPFI engine with a bad knock and shes slowly going out the door so I bought a 90 2.5 engine which is TBI.. can I just swap the intake and manifold from the old MPFI engine? I have all the gaskets for it but I'm not...
  12. YJ Technical Discussion
    I'm making a new topic, because the one I was writing in was for a different issue that I had solved before I ran into this one. 1989 Wrangler YJ, 2.5L TBI, Manual. It's the '89, so it doesnt throw codes, and has single point injection, rather than a fuel rail. When I start my wrangler, it...
  13. YJ Technical Discussion
    Im so sick of my Jeep. It's a 1989 Wrangler 2.5L manual. first my computer died on me, which I had a heck of a time diagnosing. got a new computer in it and that one blew from a short. get a third one in, and it lasts 3 days before it blows, due to it just being a bad unit. now I get it...
  14. YJ Technical Discussion
    Greeting to all Jeepsters. I have a 88 Wrangler YJ 2.5 TBI Manual Trans. It all started a month after I purchase the Jeep. It started to stall at stop signs and than turn off at stop signs. I changed he injector, rebuilt trans and transfercase, fuel pump, and battery a year ago. About Sept. I...
  15. YJ Technical Discussion
    I am going to convert my carbureted 4.2 To mopar multi-port FI or howell TBI any feed back any problems with either has anybody done this anything special I need to know I am a fair mech. :popcorn:
  16. YJ Technical Discussion
    To start, I have searched for 3 days and can not find what I am looking for. I installed an HEI distributor, it has built in coil. So I removed the Ignition Control Module, old coil, etc... Well the wiring was an absolute cluster to begin with and once the HEI was installed, it did not start...
  17. YJ Technical Discussion
    I have a 94' Sahara with the 4L and AX-15 tranny and I'm droping a chevy 350 T.B.I motor in it. My problem in doing this is not actually putting the motor and everything in, It's the whole wiring up the cumputer, My question is how exactly do I wire the cumputer to the gauges, relays, and...
1-17 of 19 Results
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