High oil pressure - 2001 Cherokee 4.0
First, I also posted this in the Comanche forum...so I apologize for double posting something - just want to get this in the right place.
Second, I'm new...so I'll introduce myself first. I live in San Antonio and own a 2001 Cherokee Sport 2x4 that mainly serves as a glorified station wagon to haul my kids and big dog around. I've had her since she was new...and she has about 115k miles on her. She's simply been the very best vehicle I've ever owned.
But she's a bit under the weather right now...at least I think she is.
Started her up this morning to go to the gym. Normally, her oil pressure is around 30 when idle...revs up to about 45-55 when under a acceleration onto the freeway. Today, however, she started out running at 45 when idle - and pegged at 80 when I was accelerating.
Worried about damaging my Jeep, I turned around and went home.
I let her sit for about 30 minutes and then started her up. Revved the engine up to about 5k RPM and she only pegged up to 60 on oil pressure. After reading my owners manual, I found that 60 is the top end of normal range. Thinking I was OK, I took her over to the gas station and filled up. Problem returned...she was pegged at 80 the whole time I was hitting the gas.
Took her back home and let her sit for a while, wiped down the sending unit and started her back up. Let her run a bit, then revved her up to 5k RPM...back down to 60 max on oil pressure.
So...took her around the neighborhood and opened her up on the two lane that goes through the subdivision. Still only at 60 max on oil pressure.
Next, I expect that she'll be back at 80 when I fire her up to go to work tomorrow.
Bad sending unit?
Or something far worse?
For what it's worth, she's had her oil changed religiously every 3500 miles and had her last oil change two weeks ago. It does look like the oil change guys were pretty sloppy that day...there was oil on the sending unit...and I had a drip on my garage floor. In addition, my wife had the oil changed on her 2007 Pacifica the same day at the same place...and they failed to screw the plug back in all the way.
I look forward to hearing from you guys...and contributing my lessons learned as I get the chance.