Oil Pressure surges a little
04-08-2010, 01:19 PM
#1
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Year: 1997
Model: Cherokee
Engine: 4.0L (242 CID) I6 MPI (High Output)
Oil Pressure surges a little
Hi I got a 97 xj 4.0l and Ive only had it for about a week and the oil pressure recently started moving a little too much for comfort. When sitting at idle it will drop a little below 40 and when driving depending on rpm will rise a little above, not to 60 or anything. When I noticed this the check engine light came on and I had to replace the O2 sensor. What do you think is causing this, it runs great and I get about 19 mpg with it.
04-08-2010, 01:34 PM
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Year: 89
Model: Cherokee
Engine: 4.0
Normal oil pressure should be around 15-20 and 40-50 depending on the weight oil you are using,it is possible your sensor is bad,40 is pretty high at idle. It is possible that the guage is bad also,I doubt it is mechanical,meaning the engine.
04-08-2010, 01:49 PM
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Year: 1997
Model: Cherokee
Engine: 4.0L (242 CID) I6 MPI (High Output)
hmmm well maybe I'll just let it go, but i forgo to mention before than when sitting sometimes when i roll the throttle on i hear a slight tick, not a knock or anything but im using 10W-30 valvoline high mileage semi synthetic oil
04-08-2010, 02:44 PM
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Year: 1997
Model: Cherokee
Engine: 4.0L (242 CID) I6 MPI (High Output)
wow 60 seems a little high to me.. the other two cherokees I had the gauge didn't work so I never really knew what they were running at. Do you think it has something to do with the oil pressure building in the head?
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04-08-2010, 10:49 PM
#10
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Year: 1999
Model: Cherokee
Engine: 4.0
I had exactly the same problem on my 99 Cherokee. The oil pressure peaked and the needle was pinned on max. I did some looking around, and found/heard nothing. I just replaced the oil pressure sensor by the oil filter.
Everything is back to whats is supposed to be.
Everything is back to whats is supposed to be.
04-09-2010, 05:14 PM
#11
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Year: 1997
Model: Cherokee
Engine: 4.0L (242 CID) I6 MPI (High Output)
oh ok well im not to worried about it. Found out today tho that my balljoints are shot...fml
04-09-2010, 07:44 PM
#12
Good luck. Let us know if you have any quetions.
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