Jump to content

Search the Community

Showing results for tags '2.5l tbi'.

  • Search By Tags

    Type tags separated by commas.
  • Search By Author

Content Type


Forums

  • Jeep® 4WD Owners Group
    • Vintage Jeep® Vehicles 1941-71
    • 1972-86 AMC/Jeep® CJ and Jeepster Models
    • Jeep® YJ Wrangler, TJ Wrangler and LJ Wrangler
    • 2007-Up Jeep® JK Wrangler 4x4
    • Jeep® XJ Cherokee, MJ Comanche Pickup and Grand Cherokee
    • FSJ Models: Full-Size Jeep® Gladiator and J-Truck, Cherokee, Wagoneer and Grand Wagoneer
    • Jeep® Liberty, Commander and Patriot
  • Dodge Power Wagon, Dodge and Ram 4WD Trucks
    • Dodge 4x4 and Ram 4WD Trucks
    • Dodge-Ram Cummins Power
    • 1941-1980: Dodge Military Trucks and Civilian W-Series Power Wagon
  • Chevrolet & GMC 4x4 Trucks and SUVs
    • Vintage to 1991: Chevrolet & GMC NAPCO and K-Model 4x4 Trucks
    • 1987-Present: Chevrolet & GMC Silverado, S-Trucks and 4x4 Suburban, Yukon and Blazer
    • Humvee and Hummer H1, H2 and H3 Forum
  • Ford 4x4 F-Series, Full-Size SUV and Ranger Trucks, Bronco II and Explorer
    • 1948-Present: Ford F-Series Trucks
    • Full-Size Ford SUV, Bronco 4x4, Excursion and Expedition
    • Ford Power Stroke Diesels
    • Ford Ranger, Bronco II, Explorer and Mercury Mountaineer
  • International-Harvester 4x4 Light Trucks, Scout and Scout II
    • International-Harvester 4x4 Light Trucks, Scout and Scout II Forum
  • Toyota Truck, Land Cruiser, FJ Cruiser, Toyota SUV and Lexus 4WD
    • Land Cruiser 4WD FJ, DJ and FJ Cruiser
    • Toyota Sequoia, Lexus, Highlander and Rav4
    • Toyota 4WD Pickup, Hi-Lux, Tacoma, Tundra and 4Runner
  • Datsun and Nissan 4x4 Trucks, Pathfinder and Xterra
    • Nissan Patrol, Pathfinder, Xterra and SUV 4x4s
    • Nissan 4WD Pickups: Datsun, Nissan, Frontier and Titan
  • 4WD Land Rover Community
    • Land Rover, Discovery & Defender 4x4s
  • 4x4 Suzuki Samurai and Sidekick/Geo Tracker
    • Suzuki 4x4 Samurai
    • Suzuki Sidekick and Geo Tracker
  • Isuzu 4x4 Pickups and SUVs
    • Isuzu 4x4 Pickups and SUVs
  • Travel Trailers, Toy Haulers, Tent Trailers and Military Surplus Trailers
    • Travel Trailer and Toy Hauler Forum
    • Military Surplus M415, M416 and Other Off-Road Trailers
    • Tent Trailers and Trailering
  • 4x4 and Single-Track Travel & Adventure Destinations!
    • Places You Have Been...
    • Places You Would Like to Travel!
    • Off-Pavement Travel Gear
    • Equipping Your 4x4 for Overland Travel
    • Health and Fitness for Four-Wheelers and Powersports Enthusiasts
  • Dirt & Dual-Sport Motorcycles
    • Dirt & Dual-Sport Motorcycles
    • Dual-Sport and Dirt Motorcycle Equipment for Overlanding
  • Quad ATV, UTV and Side-by-Side 4x4s
    • 'Quad' ATV, UTV and Side-by-Side 4x4s!
  • Welding, Metal Fabrication and Metallurgy Discussion
    • Welding and Metal Fabrication Forum
    • Metallurgy and Heat Treating Forum
  • The Right Tools and Equipment
    • Garage Tools and Equipment
    • Diagnostic and Specialty Tools & Equipment
    • Tool and Equipment Sources
  • Let's Talk and Share!
    • General Repairs and Tips (See Other Forums for Specific Vehicle Topics)
    • Off-Topic and General Discussion
    • Sharing New Products
    • Calendar Events and Outdoor Activities
  • Parts for Sale, Swap or Wanted
    • Parts for Vintage (1941-71) Jeep Vehicles
    • Parts for AMC/Jeep CJ, FSJ Cherokee, Grand Wagoneer and XJ Cherokee/Comanche
    • Parts for 1987-up Wrangler Models, Grand Cherokee and Liberty
    • Parts for 4x4 Dodge and Ram Trucks
    • Chevrolet & GMC Truck Parts
    • Parts for I-H Trucks and Scout/Scout II
    • Parts for Toyota, Nissan and Other Import 4x4 Trucks and SUV Models
    • Parts for Motorcycles, ATVs, UTVs and Snowmobiles
  • Equipment and Tools Classified Ads
    • Hand and Power Tools for Sale
    • Garage and DIY Equipment for Sale
    • Tools and Equipment Wanted

Blogs

  • 2018: "Year of Speaking Out!"

Product Groups

There are no results to display.


Find results in...

Find results that contain...


Date Created

  • Start

    End


Last Updated

  • Start

    End


Filter by number of...

Joined

  • Start

    End


Group


AIM


MSN


Website URL


ICQ


Yahoo


Jabber


Skype


Location


Interests

Found 21 results

  1. Hi, Just joined but have been using these forums for a while for information. SO I have an 88 YJ with the TBI. My issue all started when I went to get it smogged last year. Short story it failed 3 times for high NOX @ 35mph. By the third failure I had replaced every sensor I could replace, including the EGR. The cataliytic converter only has about 1000 miles. I do have the snap-on diagnostic tester, just looking for some direction to narrow my troubleshooting. Currently the jeep wont idle on its own and I can smell that it is running very rich and it seems to run a bit rough. T
  2. Bought my son a nice 86 cherokee. It has an idle problem that is driving me crazy though. I've checked for vacuum leaks and found none. I've checked all the sensors according to what I've found on this site and they check good, except the tps, I havent checked it... I ran out of time the last time I got to work on it due to rain... So it is suspect. The problem is, when you start it, hot or cold, it will surge and sometimes die for about 45 secs to a min. I can see the IAC motor slowing decreasing the idle but then right before it dies, it will snap the throttle open. Somtime's it does die bef
  3. 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
  4. 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
  5. I've been working on my 1987 YJ Wrangler 2.5L TBI for sometime now. I put in a new gas pump, gas tank, fuel filter plugs and a distributor cap. Before that I put in a new radiator due to an overheating issue. When I get out and drive for about 20 minutes it just dies and will not start back up. I let it sit for about 10 minutes and I can get another 20 minute run out of it. Please help me to get cruising again.
  6. 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>)?
  7. I recently bought a 1990 Jeep YJ with 4 cyl 2.5 TBI engine. The jeep runs great except during warm-up. It starts fine and runs and idles well initially. As soon as the temperature gauge begins to climb off the 100 degree mark, the engine begins hunting and surging and usually stalls. If I push down on the accelerator and run it to 1000+ rpm, I can get the engine to heat up to operating temperature. At that point (~160-170F) the idle becomes stable again. So far I haven't done a lot of troubleshooting but have checked the EGR valve, changed rotor/cap, air filter, and fuel filter with no s
  8. I have replaced the gasket around the dist shaft, not much more that a week later it is leaking again. I used a feel-pro gasket, I have always had good luck with them. This area of the engine isn't pressurized is it? Both surfaces were very clean when I put it together. Possible that the crankcase isn't venting?
  9. So I replaced the head assembly, rods, lifters, cam, timing chain, etc. Everything except the pistons basically. I took it to a mechanic at first but after taking it apart e decided he didn't want to work on it. I've put it back together without any left over parts. I know the cam timing is ok, I lined up the dots on the sprockets (see photo). When I dropped in the distributor I had the oil pump notch just past the 3 o'clock position, and when it dropped in the rotor was at the 6 o'clock position just like the manual says. But to make things even better, when the engine is turning over, every
  10. I have purchased an 87 yj tbi 2.5. With help from this site I have been tinkering with this thing trying to get it to run as its suppose to especially in this cold weather. I was looking at my egr valve while I was replacing the vacuum lines and noticed it was unhooked and the line feeding it is plugged. I did notice that the vacuum port on the egr was facing the front of the jeep, that seems to be the wrong direction to me.
  11. I'm at my wits end troubleshooting my lil 2.5L engine. I googled and found your page from about a year ago. 1990 jeep wrangle 25l engine timing. Today I thought about timing. It misses, like running on only 2 cylinders when at low speed and and only pulling slightly. As I move into mid and upper rpm range it stops missing. I still do not have much acceleration but at least it stops missing. I've check and/or changed every sensor it has. TPS is only rough since I have not gotten my laser tach to work yet. In checking fuel I have only 10 psi so I know that's a problem. This s
  12. Hello all! Running into an issues on my 1990 2.5l tbi std shift wrangler and need some help. First a little background. I was in the middle of a full rebuild when I had to relocate, so my brother back in Ohio is completing the rebuild. He put the fully rebuilt and assembled (by machine shop) motor in. I bought every sensor on the motor to replace, as well as new injector. Everything on the motor is new except the fuel pressure regulator and intake. A year ago I put a new fuel tank and pump/sending unit and filter in also. Now the problem.....My brother has everything together. It fires ri
  13. I hate to bring this up again, but I need help. I have a 1990 2.5 TBI wrangler that is killing me! I say I've been throwing parts at it, but given it's age everything I've done was either bad or well on its way. Now that almost everything has been replaced including the IAC I need help adjusting it. I assumed the IAC was in the correct position when I replaced it, but I'm suspect the PO had adjusted it when some of these parts I replaced went bad or possibly when they plated off the EGR (I replaced the egr and cleaned the egr tube) and now I find myself trying to adjust the IAC. I've adjusted
  14. Here is 1987-90 Jeep YJ Wrangler and Jeep XJ Cherokee/MJ Comanche 2.5L TBI diagnostics information in PDF form. The first document includes all sensor and switch tests plus adjustments that affect engine tune, idle and reliability. Wiring schematics and ECU pin locations, test plugs and diagnostics included. Jeep 2.5L TBI Complete Diagnostics-Sensors-Switches.pdf Jeep 2.5L TBI ECU Inputs and Outputs.pdf Jeep 2.5L TBI MAP Sensor Test.pdf Jeep 2.5L Timing Chain and Tensioner.pdf Jeep 2.5L Valve Timing Check.pdf Jeep YJ 2.5L TBI Sensors and Pinout.pdf YJ Wrang
  15. T-shooting an intermittent starting problem. About 80% of start-ups are perfect. When failing to start, it will turn over and over, but won't fire up. Sometimes starter fluid will cause it to fire up and then it runs fine, but that's only 50% effective. The rest of the time, only push-starting will work, but push-starting does work every time. Most obvious assumption is fuel problem, but fuel system checks out fine (replaced almost everything over time anyway). Ignition/electrical is fine. Also, the problem seems to be completely independent of outside and engine temperature. I st
  16. 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.
  17. Hi, I have a 1988 Jeep Yj 2.5 with the renix computer. My last stop before I drive this thing off a cliff is here. I should have come here first. I hope one of you can help me. I love my Jeep but am so frustrated with it right now. Problem: Jeep is running super rich. I do not think it is ever coming out of closed loop. Points to know: - O2 sensor is recognizing that the jeep is rich. Volts sit between .94V and .99V JEEP RUNS AWESOME. No loss of power. No hesitation. Idles between 900 and 750 - Fuel smell coming from the tailpipe Emissio
  18. Hello im new to this i am from hawaii i have a 1989 jeep wrangler and have a brand new motor installed it had an idle problem so i changed the tps set it in between 4.6 and 4.7 on the multimeter which is what the dealer said to set it as and it runs for ten minutes and as soon as i tal the gad it sputter then dies any ideas ?
  19. Thanks for the engine information. Ok .... update for today. I'm really not finding a vacuum leak and before I build a smoke machine there's been this gnawing in the back of my mind to check the valve timing. I found this pdf manual http://oljeep.com/JeepEngines.pdf and on page 63 it tell how to check valve timing. So I removed all the plug, it was easier to rotate by removing all the rocker bridges, set up a dial indicator on the #1 intake push rod and checked .... Hmmm the dial moved .010 but I don't see the index mark anywhere (????) ... oh, there it is 3 inches to the left, or 3 i
  20. In the second pic I know the line at arrow #1 goes to the air cleaner. Can anyone tell me where #2 and #3 should go? first pic is just a close up of the connections in question. Thanks
  21. My 88 Comanche 2.5 liter doesn't have a wot sensor did some of them not come with them or maybe some one took it off when I wasn't looking
×
×
  • Create New...