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  1. C

    '00 XJ Engine cuts out and dies

    Maybe it was the threat of violence (or the three cans of gas treatment) but my Jeep now denies ever having a starting problem. I made about 10 laps around the block, then three trips of about 10-20 miles each, then I threw it in 4WD-LO and took it down in the sand pits. Not the slightest...
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    Effect of tires on mileage?

    I would agree on the thermostat issue. My '00 Sport runs 210* whether I'm driving through a snow storm in OH or I'm stuck in traffic down here in FL. If you think its your bearings or brakes dragging, then something has to be making some heat to slow you down. After a good drive on the...
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    Under acceleration, vibes in my butt!!

    Yep, more thank likely the U-joints. I drove my Toyota through some deep water and (shame on me) did not grease the joints afterwards. Took about six months and the rust just chews up the needle bearings. It could also be wear on the ring and pinion, but that seems unlikely for a '98, unless...
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    Changed the oil and now the engine ticks.

    So... you changed your oil, then you added the Seafoam, then the ticking started? How much Seafoam did you put in?
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    '00 XJ Engine cuts out and dies

    Well, in my case, its just the engine that dies. Everything else still works. Its cut out while (1) sitting in the driveway idling, (2) driving down a dirt road at 10 mph, and (3) drive down the highway at 50 mph. Something seems to be tripping the ECU and causing it to kill the engine...
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    2000 XJ - Gas tank anti-siphoning screen?

    I was going to drain the tank (on my 2000 XJ Sport) before I pulled it, but couldn't get the siphon hose to go in, so there might be some sort of screen or grid built in. Since I had a full tank to deal with, I went down to Harbor Freight and got a motorcycle/ATV jack for $60. Worked like a...
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    Changed the oil and now the engine ticks.

    Every few oil changes, I would add about 4 oz of Berryman B12 Chemtool and about 8 oz of Marvel Mystery Oil to the old oil, idle for five minutes, then change the oil. Usually ran Castrol or Quaker State. My '89 Toyota truck had 190,000 miles on it and the valvetrain looked good as Day 1. The...
  8. C

    '00 XJ Engine cuts out and dies

    OK - I went to Advance Auto and dropped $40 on the fuel pressure gauge. The beast decided to start and I got 48 psi at idle. In fact, it kept a fairly steady 48 psi as I revved the engine. I hooked up the scanner and waited and waited.... and the d*** thing ran 90 minutes without a hiccup...
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    Vibration - searched - didn't find much

    I had a similar condition on my '00 Sport - vibration would come on around 50mph and go away around 60mph. Felt like a side-to-side shimmy. I had new tires put on, front end alignment, checked and greased all the joints myself, and it still shook at the exact same speeds. I finally installed...
  10. C

    Under acceleration, vibes in my butt!!

    Yes - unless everything is balanced/just right, you will get 'some' vibration in the driveline. ( - part of my day job is driveline analysis) If U-joints are worn, you might also hear or feel a 'clunk' whenever you suddenly accelerate or let off the gas. Just get underneath and check them...
  11. C

    Fuel Tank Pressurization

    While troubleshooting my current "sudden death" syndrome (http://www.naxja.org/forum/showthread.php?t=68356) I noticed that the fuel tank was not pressurizing like it used to. My current driveway anchor is a 2000 Cherokee Sport with 4.0 engine. The fuel tank has the top-mount all-in-one fuel...
  12. C

    '00 XJ Engine cuts out and dies

    OK - so how do I tell if that is what's happening? Right now, the Jeep is deciding that it will start up and I have an OBD-II code scanner (Actron CP9145 Super AutoScanner) which also shows real-time data. What can I be looking for? When it does quit, there is no check-engine light and no...
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    '00 XJ Engine cuts out and dies

    langer1 - how do I measure WOT signal? I've got a multi-meter but no manual. When it finally did decide to run, I disconnected the throttle position sensor and it kept running (and gave error codes). I don't even touch the throttle while starting because its fuel injection. Like I said, I...
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    '00 XJ Engine cuts out and dies

    mattmankow - I'm trying to rig something up so I can check the fuel pressure, but it doesn't seem to be acting like that's the problem. It doesn't slowly cough and sputter, it just dies, and I'm not getting any error codes for lean mixture or the O2 sensors. But I'm going to check... I'm...
  15. C

    '00 XJ Engine cuts out and dies

    Bowzer - no, the battery is fine - I could probably crank the engine for five minutes straight. But, just to be sure, I topped off all the cells and cleaned the terminals. No change. Langer1 - I don't have a "fuel pressure gauge" or anything else that fits the fuel rail port - I'll have to...
  16. C

    '00 XJ Engine cuts out and dies

    OK - here goes again... A few weeks ago, I go to start my Jeep and it cranks and cranks but won't start. No CEL, no error codes, yet it won't start. I moved it, facing downhill, and the next day it starts but only runs for a few minutes and dies. Restart and it runs for 10-20 seconds and...
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    '01 XJ Misfire Questions

    I had a similar problem on my '00 XJ Sport with 4.0 engine. The problem, in my case, was one of the injector wires was shorting to ground and running that injector open all the time. Ran rough, poor mileage and Error Code P0202. On mine, the wiring harness for the injectors was rubbing on the...
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    2000 Sport won't start - NEED HELP! ECU pin out?

    Thread #4... Can anyone tell me what would cause the ECU to kill the auto shut-down relay circuit at start-up, without giving any error codes or CEL? Just started doing this, no previous stalling problems. It might start and run for a few minutes, then it just dies. Might restart, might not...
  19. C

    Effect of tires on mileage?

    I think the things I would check would be: - front end alignment (check toe-in, check steering damper) - axle alignment (rear axle tracks square with front end) - tire pressure (correct pressure for your tire) (not all 235's are the same load rating...) - check brakes (pads dragging?)...
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    WTF? 2000 Sport starts but dies - HELP!

    No, I don't think thats it. The pressure comes up after about 2-3 seconds of cranking and gets up to 30-40 psi. I just went out and checked the ASD relay again. With ignition on, I pulled the relay, re-inserted it, and got a "click" from the relay. OK, right? But I checked the injectors and...
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