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Old 08-30-2012, 05:35 PM   #1
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2000 model TJ 4.0 oil pressure

Hey guys, this is my first post...
I gotta 2000 model w/ 4.0 and I am having an issue with oil pressure. It runs normal 85% of the time, however it drops below normal at idle sometimes and runs ruff. Seems to be when hot outside but not always. Oil level is good, motor not over heated, I'm stumped! Any help would be appreciated greatly? Thank you.

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Old 08-30-2012, 06:14 PM   #2
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There are several topics about this... I had the same issue.. Check your oil pressure sending unit

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Old 08-30-2012, 06:21 PM   #3
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How low doesn't drop? Oil pressure wail fluctuate with engine rpm to some degree. The oil pump is engine driven not electric. As for it idling rough, could be a lot of things not related to the oil pressure at all. May need to clean the throttle body and or iac (idle air control valve). May need the idle adjusted. Or possibly a sensor. You can run a basic diagnostic by turning the ignition on and off 3 times within 5 seconds ending in the on position. The odometer will show the codes, and the check engine light will blink the codes too.
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Old 08-30-2012, 06:30 PM   #4
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Quote:
Originally Posted by Iceman
How low doesn't drop? Oil pressure wail fluctuate with engine rpm to some degree. The oil pump is engine driven not electric. As for it idling rough, could be a lot of things not related to the oil pressure at all. May need to clean the throttle body and or iac (idle air control valve). May need the idle adjusted. Or possibly a sensor. You can run a basic diagnostic by turning the ignition on and off 3 times within 5 seconds ending in the on position. The odometer will show the codes, and the check engine light will blink the codes too.
Not in 2000 year models
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Old 08-31-2012, 11:07 AM   #5
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Originally Posted by kfdjason7620

Not in 2000 year models
Works in my 97, when did they change.
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Old 08-31-2012, 12:24 PM   #6
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Originally Posted by Iceman View Post
Works in my 97, when did they change.
That ability was lost in the '98-'00 models. It returned in 2001.
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Old 08-31-2012, 06:33 PM   #7
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Thanks Jerry for clarifying that, I was unsure of the years

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