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Old 01-25-2017, 09:39 AM
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Jeep RPM and oil issue

Hey guys, I have a 1995 YJ 2.5l, my question to you all is this, what could cause my RPM limiter to change from 6k to 4.5k? And also something I can't figure out is my oil psi, it goes from 40 on cold start and slowly creeps its way down to 10 when it gets warm, then at idle it reaches 0 and goes back to up 10 again when I'm moving. Any ideas on what's going on?
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Old 01-25-2017, 10:13 AM   #2
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Are you sure that it is your rev limiter? Could be that your engine is suffering a major failure. Especially with the oil pressure that you are seeing. I would verify that your oil gauge is correct first, if your oil pressure is really that low then that engine needs to be serviced immediately

1992 YJ with 5.0 Ford, M5OD R2 Trans, BW 1356 TC, Ford 8.8 rear axle, sitting on 33 x 12.50 BFG MTs.
Aluminum 3-core rad, Electric fan, 8k winch
-More mods to come-
LSD 8.8, custom dash, front and rear bumpers, extended rear axle, fender mods, etc, etc, etc
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Old 01-25-2017, 04:30 PM   #3
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When was the last time your oil and filter were changed?
If it wasn't recently, I suggest that you start with an oil/filter change.
If you still have the oil pressure issue, then I suggest you get a mechanical (analog) oil pressure gauge and attach it with a "T" fitting at your oil gauge sending unit location.

If the oil pressure problem persists, I suggest you drop your oil pan and check the oil pump.

What makes you think your rev limiter has changed from 6K to 4.5K? Do you ever rev your engine to 6K? I don't have a 4cyl. engine, so I am unaware of how they are typically driven.

Good Luck, L.M.
1987 YJ-4.2L-Standard Shift- Re-manufactured Carter Carb-2" body Lift-31X10.5X15 BFG KOs-190K Miles
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Old 01-25-2017, 11:41 PM   #4
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what oil are you using??/ 30 wt 10/40? your oil could be breaking down ( just a thought)
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Old 01-27-2017, 01:03 PM
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It's a rebuilt motor with 2000 miles on it which my dad and I did, following the maintenance manual for engine overhaul.
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Old 01-28-2017, 05:04 AM   #6
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I would at the least change the oil pressure sending unit, my old 90 YJ did the same thing on the gauge and I was thinking worn bearings, but had no ticking, changed sender now all reads good, around 45 cold and down to 30 a idle hot, back to 40 when driving.

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