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Pegged oil pressure gauge
- Thread starter srimes
- Start date
- Location
- Seattle, WA
Probably just a bad sending unit. You can grab one at the local parts shop.
upstatejeeper
NAXJA Forum User
- Location
- Schenectady, New York
I had that problem too on my 2000 XJ. On cold starts the oil gauge would Peg at 80 until the engine warmed up. However it wouldn't reset into the normal range until I turned the Jeep off and back on. I asked some friends and they found no apparent problems so I ignored it. One year later, I switched to Castrol Syntec Blend as I was piling on the miles in City driving and since then I have yet to have this problem. I don't know the tecnical reason other than that Synthetic has cleaning agents in it but 70+ cold starts later I've yet to peg the gauge.
5-90
NAXJA Forum User
- Location
- Hammerspace
Bad sender or loose connection. Make sure the connection is tight before you condemn the sensor - since checking the connection is free...
Original_MudButt
NAXJA Forum User
- Location
- In the eighth dimension
Sounds like a short to ground.
90Blue_XJ
NAXJA Forum User
- Location
- In yer postz fixin yer spellinz.
The connection was or is probably loose and you last oil chage someone touched it and or tightened it when chenging filters. So my vote is for a loose connection at the sender.
aparke4
NAXJA Forum User
- Location
- Atlanta, Ga
mine stays at 80 - i have almost 100k on my 99 and it is the sending unit - i just gotta go get one a swap it out - i think i was quoted right at 43 dollars at my local dealership - i checked the wires and unplugged the unit back in and it hangs at 80 still so i just gotta get a new unit - my jeep idles and drives fine but it is just one of things that goes out like a cps sensor
Matthew Currie
NAXJA Member #760
- Location
- Vermont, land of big clay
No year given for original post, but remember that pegged = shorted for Renix era (pre-91) and open or disconnected for later ones.
Maverickj1
NAXJA Forum User
- Location
- Kansas City, MO
If you replace your sending unit, get the one with the lifetime warranty. Mine goes bad every 9 months to a year. I just take it back to orielly and trade it out, no problem.
birchlakeXJ
NAXJA Forum User
- Location
- Melrose, MN
If you find out you need one, I'd recommend getting a new sending unit (sometimes called an oil switch) directly from Jeep. My experience is that they not only last longer, they are a smidgen more accurate with your factory gauge.
Markos
NAXJA Forum User
- Location
- Seattle, WA
Mine started doing this over the weekend. I visually inspected the connection and it looked go. I replaced the sensor with a new mopar unit last year. Hopefully it's just a bad connection. I recently changed the oil, so it would make sense that this is a connection problem.