WJ oil pressure question

VortecJeep

VortecJeep

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Joined
Aug 24, 2005
Location
Concord, NC
2002 WJ, 4.0, automatic, 4x4, 153,000 miles
Just changed the oil earlier in the week. Used the same 10W-30 I always use, 6 quarts. I tried a different oil filter. Had been using Fram oil filters ever since I bought the jeep in 2003. This time I decided to try a Mopar oil filter. Now I have noticed that the oil pressure appears to be much higher. It had always been near the half-way mark on the factory gauge, now it is close to the H. Could the different oil filter be the cause? Do I need to put a mechanical gauge on it to see what is really going on?
 
Its fairly common for the oil pressure gauge to read high on WJ's. Everything I've read said you don't really worry about it unless its low. Before we rebuild my engine, the oil pressure gauge was very high (maxed out). Since rebuilding/cleaning everything, the oil pressure gauge reads in the middle at idle and goes up when accelerating...
 
The oil pressure sending units on the WJ are awful for going out and reading correct sometimes... high others... low or zero others... Does it stick on high, or go straight to high and stay there?

If so and you're sure you didn't way overfill it or something like that I'd go pick up another sending unit and install it. It's just above the oil filter and you need a large socket to remove (just cannot remember what size).
 
Not sure of the year change, but I'm pretty sure your,s is new enough that it does not read actual oil pres. It just reads high/low. My 98 dodge has the same thing. POS drops to 0 alot at idle. New sending unit is over $100, old style that reads actual psi is $20, not interchangable.

Lots of wj info here

http://www.wjjeeps.com/jmenu.htm

Also search fram filters, they seem to be the one of the shittest filters you can buy.
 
rockmafia said:
Not sure of the year change, but I'm pretty sure your,s is new enough that it does not read actual oil pres. It just reads high/low. My 98 dodge has the same thing. POS drops to 0 alot at idle. New sending unit is over $100, old style that reads actual psi is $20, not interchangable.
Lots of wj info here
http://www.wjjeeps.com/jmenu.htm
Also search fram filters, they seem to be the one of the shittest filters you can buy.
Click to expand...
Thanks, yeah I had personally never had any problems with Fram filters, but heard some bad OE on them, so I went with the Mopar this time.
 
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