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Found 16 results

  1. Hello All, i need your help. i have a 2.5L that I cannot make run with the MAP sensor plugged in. I have tested the MAP sensor and it reads good. i have tested the MAT, Engine Temp and Idle Air Control Motor as well. Replaced the TPS, O2 sensor and the ECU. i have checked for Vacuum leaks and have come up with nothing. it runs better with the MAP unplugged from vacuum. I am running out of ideas. Any help would be greatly appreciated.
  2. 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 started about a month after the SMOG guy changed the O2 sensor to pass smog. I've check the voltage when hot and it's within spec. I also had massive exhaust gasket leak so I cleaned the surfaces and replace the gasket. I'm a machine mechanic from way back in the Navy so I'm not just a new mechanic. I just can't quite figure this one out. I'll check timing tomorrow. Lowell
  3. 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 Wrangler 2.5L TBI Wiring of WOT to ECU.pdf Jeep YJ 2.5L ISA Wiring Diagram.pdf 1987-90 2.5L TBI Intake Manifold and Sensors.pdf 1987-90 YJ Wrangler 2.5L TBI Emissions System Parts.pdf YJ Wrangler Fuel Filter and Guard.pdf 2.5L TBI ISA Motor Adjustment.pdf Used in conjunction with the many forum exchanges (search under "All Content" and "2.5L TBI" in the search box), plus the Jeep 2.5L TBI troubleshooting article at the magazine website, this information will help solve your Jeep YJ Wrangler or XJ Cherokee 2.5L TBI troubles. In references, the Model 81 is the Jeep YJ Wrangler. The Model 60/70 is the XJ Cherokee and MJ Comanche Pickup. Moses
  4. 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 Wrangler 2.5L TBI Wiring of WOT to ECU.pdf Jeep YJ 2.5L ISA Wiring Diagram.pdf 1987-90 2.5L TBI Intake Manifold and Sensors.pdf 1987-90 YJ Wrangler 2.5L TBI Emissions System Parts.pdf YJ Wrangler Fuel Filter and Guard.pdf 2.5L TBI ISA Motor Adjustment.pdf Used in conjunction with the many forum exchanges (search under "All Content" and "2.5L TBI" in the search box), plus the Jeep 2.5L TBI troubleshooting article at the magazine website, this information will help solve your Jeep YJ Wrangler or XJ Cherokee 2.5L TBI troubles. In references, the Model 81 is the Jeep YJ Wrangler. The Model 60/70 is the XJ Cherokee and MJ Comanche Pickup. Moses
  5. 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 started reading about ECU inputs, and discovered that during startup, an engaged WOT switch causes ECU to cut off fuel because ECU thinks it will flood the engine. The WOT switch is worn, but shouldn't prevent starting if disconnected. Would any other ECU inputs prevent fuel flow during start-up if their signals are outside normal limits? Service manual says during "Ignition On", CTS, MAT and MAP sensors begin providing input to ECU, but doesn't list MAT or MAP sensors during actual start-up. See attached page. So which sensors matter to ECU for start-up fuel supply calculations or decisions? Also, during push-starts, the ignition (key switch) is in the Run position, and not the Start position, which changes the ECU inputs, too. My shop has a DRB II diagnostics reader, but unless they hook it up when it happens to be misbehaving, shouldn't everything check out ok? Unfortunately, I've never been able to get it to fail at the shop. I also tried replacing the fuel relay. I also noticed that it is no longer cycling the ISA motor when it fails to start. It used to, but I can't figure out why it did that anyway. What are my next moves? Might be trying to oversimplify this, but what kind of intermittent problem would occasionally prevent a normal startup, but NEVER prevent a push-start from succeeding?
  6. 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 ?
  7. Hello I have a 1990 Jeep Wrangler 2.5l and I'm having a problem keeping it going it will start and I have to keep my foot in it to keep it going once I let off it will die does not idle then it will not start again what's my problem thanks?
  8. My Jeep YJ Wrangler 2.5L (MPI not TBI) engine has no fuel pressure when it cold. Installed a new fuel pump and pressure regulator, swapped relays. When the Jeep is parked inside it runs and has fuel pressure. When we put the gauge on to check fuel pressure at the rail, inside we get around 39 psi. When we let the Jeep sit outside overnight and check pressure we have none. Any ideas? Thanks.
  9. 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 inches BTDC ... really???? Guess I'll pull the timing cover and check it out.
  10. Hello everyone, I have the best luck finding useful tips and information for things that are over my head. I have noticed a huge difference in what the tachometer reads verses what the scanner says. I looked all every where for a proceedure on how to test go about on figuring out why the readings are so different. Could my ecu have a problem?
  11. Hello, first off let me begin by saying thank you to Moses for your site. It has helped me fix a lot of issues with my jeep. I have a 1988 jeep yj with the renix 2.5 tbi setup. The problem is that the jeep starts and runs but consistently spit, sputters and stalls. I can be driving down the road doing 55 mph and then it is like somebody turns the key off and back on again. it does this at idle as well. Things I have already done/replaced: new cap, rotor, plugs, wires, coil, ign. Module, ign. Switch, and the cps. I have gone through and tested the coolant temp sensor (for the ecu), intake temp sensor, map sensor. Also pulled the wiring harness from the engine compartment and went through each individual wire with my multimeter to ensure that they were good. I did this under the dash as well and cleaned all grounds. The throttle body i rebuilt about 6k miles ago. New fuel filter and pump. I am at a loss at this point and i hope for some guidance. The only thing i can think of is the ecm is going out but not positive. Thank you for your help, and i look forward to your reply Thomas
  12. 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
  13. Need help. I recently replaced a cracked exhaust manifold and have a leak at the connection from the manifold to the converter. I looked in the jeep manual and found that there is a seal ring for this connection. I bought the seal ring but it doesn't fit. The manifold has a donut shape to it already and the convert has the inverted donut shape. The old manifold when removed did not have a seal ring on it. Has anyone ran into this while working on their Jeep? The Jeep is a 99 Wrangler with the 2.5 liter engine. Any recommendations on how to fix the leak?
  14. 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?
  15. Hello all, '94 Wrangler with 2.5L, about 170K+ miles ... initially running rough under load followed by loud top end noise. Found #2 intake lifter had been beaten quite a bit by the cam lobe (which was also now quite worn). No other wear found in valve train (push rod not bent) and valve not stuck. Replaced cam and lifters but less than a 100 miles later same lifter is in same condition (contact face noticeably worn from cam lobe and engine running rough under load). I should also note assembly lube was applied to the bearing surfaces, lobes and lifter faces. Ran it in at 1500 rpm for 20 minutes. Oil pressure is good and good oil flow through lifters and push rods. The only thing I can theorize is the lifter "bearing" (hole in block where lifter sits) is oversize and lifter is "chattering" in the bearing, causing it to stick and get beat up by the cam lobe. Has anyone else experienced this? Thanks, Chris
  16. Ok, here is my situation. i am new to the the jeep owners world. I have wanted a cj since I was 13 yrs old and I finally got one about 2 months ago. I bought an 85 cj7, it has a 2.5 l 4 cyl with a t4 transmission. I bought it with the expectation of putting in a different motor and trans, however, what I did not count on was how much body work I would end up having to do. The body work has taken a huge chunk out of my budget for the motor. A buddy of mine gave me a 4.0 out of his 88 comanche. the engine ran but had been sitting for 7 yrs and all of the seals leaked, including the main seal. My original plan was to use this motor and carburate it since I don't have all of the parts for the fuel injection and I want to keep it as simple under the hood as possible. My question is, would this be possible and could i use the existing motor mounts. Also, what else would I have to do to make this work? Any help on this would be greatly appreciated. Thanks
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