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Smurf Rider, 2003 JEEPY: Worst Mechanic/Fabricator
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Odd issue cropped up today...
92 YJ, 4.0, Manual
Jeep was running fine the last time i had it out.
Since then i've changed the oil, and adjusted the parking brake.
Today i took it out for a short trip. About 10 miles out, 10 miles back. (all on pavement)
On the way out, i was coming down a hill, in gear, using the engine to keep my speed constant. Got to the bottom of the hill, and pushed in the clutch to stop, to find that the motor had cut out.
My gas guage doesnt work, and i knew i was low, so i assumed i was out of gas. It didnt seem quite right to me though, as there was no stuttering. Turn the key, i still hear the fuel pump engage. So that's fine.
I called my wife, who was 2 blocks away (thats where i was going, her parents place). She brought gas, i put it in the jeep, fired right up, i figure problem solved.
When i went to go home however... After the first 5 min or so of driving, the motor cut out. This time i was on the throttle, going up a grade.
I pull over, try to restart nothing. I turn off the ignition, wait a few minutes thinking about the situation, it starts up!
I thought maybe this was related to the earlier "gas" mishap. Didnt quite add up to me though. Air in the gas line? Nah, i wouldnt have gotten _that_ far on what was in the line...
So i decided to trek on. I made it about a minute, again, on the throttle. And it cuts out again. This time i left the ignition on and pulled over. let it set a few minutes, turned the ignition, wont start.
Turned off the ignition, waited a minute or two, started right up.
I did this routine a few more times. getting about a minute or run-time per attempt. Then i was finally at the top of the grade, and was able to try coasting. I fired it up again, got up some speed, and then took it out of gear and coasted.
I got about 7 minutes of run-time out of it, which got me to the bottom of the hill. Sure enough after i started getting on the throttle again, it cut out again.
This time i tried keeping RPM's down, and i seemed to have better luck. I could get some distance at low rpm's (under 2K).
Something i noticed is that the oil pressure seems higher than i remember it.
Right now i'm letting it cool, and i'm going to check the oil level, to see if its high. If it is i'll drain some and see if that helps.
Any other suggestions on what this might be?
I seem to remember the oil pressre guage staying around 40 once the motor was warmed up, now it rides around 60. Can anyone confirm if this is higher than normal?
Thanks!
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Undrground.org Underground BBSMy RigRater Score: 565RRv1.0 with a BOA of 18.92
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Post #661702
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Smurf Rider, 2003 JEEPY: Worst Mechanic/Fabricator
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Ok, i checked the oil, its not overfull. Well, its just slightly over the top "safe" line on the stick, but the motor was still just slightly warm when i checked it. I'll check it again tomorrow after its sat for a while.
I let it idle in the driveway for a while, not so much as a stumble.
I revved the engine up as high as 2500 rpms, and let it stay there for a bit, the oil pressure peaked at about 60, and the motor did not cut out.
I took it out for a ride. Through town, (no higher than 3rd gear) all was well, as soon as i got to an open road, it stalled out twice as soon as i hit 4th gear. Both times will on an uphill. When i was taking it back home (going back down hill on the same open road) i did not get any stalls in 4th.
This feels like its either an electrical problem, loose ground or something. Or some kind of safety cut off. Is there such a beast on a 92 4.0?
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Undrground.org Underground BBSMy RigRater Score: 565RRv1.0 with a BOA of 18.92
Edited: 6/23/2010 9:47:59 AM by
YJ Nate
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Post #661705
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I had a mysterious engine dying issue years ago that turned out to be vapor lock. Release the valve on the fuel rail and tons of air spews out...then gas flows and you close it off. Fired right up for me. Then, well, the rig got stolen - so I'm not sure what the solution would have been for this...but that was certainly my issue.
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Post #661709
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2003 JEEPY: Biggest Sleeper (3x tie)
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Nate, I would rule out oil pressure as the cause, a 4.0 does not have an oil psi shutoff to the best of my knowledge, most vehicles that do have it on the low side for when you burn all the oil and loose pressure
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Post #661711
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Mellow Yellow, 2003 JEEPY: Male Wheeler of Year!
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Did you mess with the parking brake pedal? If so, there is a ground wire at the pedal mount that grounds the fuel pump system. If you have a loose connection, it can cause your symptoms.
Bob  http://www.jeepaholics.com/rides/view.asp?id=147 Some people try to turn back their odometers. Not me, I want people to know "why" I look this way. I've traveled a long way and some of the roads weren't paved. <Will Rogers> Fat City Racing 2009 Baja 1000 Class Champions Dust Junkies Racing 1706
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Post #661717
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Smurf Rider, 2003 JEEPY: Worst Mechanic/Fabricator
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bob91yj (6/24/2010)
Did you mess with the parking brake pedal? If so, there is a ground wire at the pedal mount that grounds the fuel pump system. If you have a loose connection, it can cause your symptoms.
The pedal itself was not touched. Other than general operation of the pedal, which has not changed. Even when the brake hardly worked, i still used it.
I'll check anyway, thanks!
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Undrground.org Underground BBSMy RigRater Score: 565RRv1.0 with a BOA of 18.92
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Post #661719
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Smurf Rider, 2003 JEEPY: Worst Mechanic/Fabricator
Group: Moderators
Last Login: Today @ 12:20:27 AM
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Visits: 18,044
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Post #661720
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Smurf Rider, 2003 JEEPY: Worst Mechanic/Fabricator
Group: Moderators
Last Login: Today @ 12:20:27 AM
Posts: 14,279,
Visits: 18,044
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Post #661721
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Smurf Rider, 2003 JEEPY: Worst Mechanic/Fabricator
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Last Login: Today @ 12:20:27 AM
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Found a few things online that mention the CPS and TPS both being causes of similar issues... Does this make sense to anyone out there?
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Undrground.org Underground BBSMy RigRater Score: 565RRv1.0 with a BOA of 18.92
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Post #661722
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Group: Forum Members
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My CPS caused similar issues on my Durango, but after about the 4th time, it just wouldn't start.
The TPS could cause that as well.
 If someone with multiple personalities threatens to kill himself, is it considered a hostage situation?
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Post #661723
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