oil pressure drops under load
01-12-2012, 04:20 PM
#1
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Model: Cherokee
oil pressure drops under load
I have a 92 4.0L cherokee. the oil pressure runs 30-40 at idle but when i accelerate it drops to just about 0. When it get around 2k rpm and up it begin s to have a small clatter in the engine when the oil pressure hits 0. The engine has 167k on it and it solid. With the jeep in park i can rev it with consistent oil pressure between 30-40 with no chatter. So it seems as the issue is only when it is under a load. i checked the oil and it is at a good level. im thinking it may be the oil pump? any ideas? thanks
01-12-2012, 05:00 PM
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I have a 92 4.0L cherokee. the oil pressure runs 30-40 at idle but when i accelerate it drops to just about 0. When it get around 2k rpm and up it begin s to have a small clatter in the engine when the oil pressure hits 0. The engine has 167k on it and it solid. With the jeep in park i can rev it with consistent oil pressure between 30-40 with no chatter. So it seems as the issue is only when it is under a load. i checked the oil and it is at a good level. im thinking it may be the oil pump? any ideas? thanks
01-12-2012, 05:15 PM
#4
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Year: 1997
Model: Cherokee
Engine: 4.0L
Mine did this but didn't make any noise. That kinda scares me. I would walk to the parts store and rent a mechanical gauge. Then test it before you drive it much. Mine was just a loose wire. I figured this out after i replaced the sending unit.
Last edited by reddonkey; 01-12-2012 at 06:46 PM.
01-12-2012, 05:58 PM
#5
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Year: 1999
Model: Cherokee
Engine: 4.0
Verify your oil pressure with a mechanical gauge. They can be rented from many big box parts stores.
GOOD DATA = GOOD DECISIONS
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