oil pressure

  1. Lorado

    Continuing oil pressure issue with 4.0

    Hi all A little over a year ago I bought a 97 tj sport 4.0 manual. It currently has 135k on it. When I first got it I noticed low oil pressure when warm so I started with the pressure sender, then a high flow oil pump. Then this past weekend finally got around to main bearings and then a...
  2. Clocktower07

    Is it Possible to Bypass the Oil Pressure Sender Without Dash Warnings?

    I’m encountering periodic low oil pressure readings while stopped and I've tried most of the common fixes. Every couple of days, my oil pressure gauge drops to 0 at stop signs. This reading is accompanied by a single chime and the CHECK GAUGE light. When I start going again, the needle...
  3. L

    Oil pressure drops at idle; sends engine in limp mode

    I’m at a loss rn and need some help/direction. I recently overhauled my ‘97 TJ 4.0. Oil pressure was dropping on me once eng warmed up at idle...pressure fluctuates when it accelerates then drops to 0..check gauges light pops, then eng is in limp mode (barely running and dies on me when sitting...
  4. Robbob

    High oil pressure, loosing coolent. 2.5l

    Hello, have a little bit of a strange dynamic. I have high oil pressure. I don't know what the ranges are off the top of my head but it goes from like 2.5 to 5. It started recently pinning to five on throttle and then going down to 3.5 slowly when I let the throttle off so when I'm throttling...
  5. CODE5

    Low oil pressure caused by sludge in oil?

    Brief backstory: I had a blown head gasket and cracked head on my 02' 4.0L. The engine was VERY sludgy when I opened the valve cover, not black sludge — more like chocolate milkshake sludge. I got most of it out that I could but I know there are remnants in the engine. When it came time to add...
  6. P

    Oil Pressure Gauge Always Reads Zero

    Okay so to start from the beginning I bought a 2001 jeep Tj and it always had oiling issues but one day the gauge dropped to 0 and never went back up so I rebuilt the motor in hopes to fix it and the gauge still reads 0. I have replaced the sending unit and still nothing, I use a manual gauge...
  7. Ryno

    No oil to the cylinder head

    Howdy all, I've been having some ongoing issues with my TJ. Hoping someone can lead me in the right direction with solving the problems. First I had a loud chirp/squeak coming from the engine. Discovered there was a rocker arm that was dry and rusted. Changed that pair of rocker arms and...
  8. DropTopDon

    Oil Pressure Sending Unit

    I am looking to replace my Oil Pressure Sending unit as my oil pressure gauge does not seem to be displaying my oil pressure building. Would anyone advise against picking one up from the local auto store? I know they are rather inexpensive in the first place but I am trying to save money...
  9. Travis Davis

    Oil Pressure Gauge Not Working

    So i have been driving around for 2 weeks with my oil pressure gauge not working and just today went to the parts store and they told me it was my OPSU. I got home and switched them out. Still not working. Any ideas??
  10. Nick B

    2000 Wrangler Oil Pressure Problem

    I have a 2000 Wrangler Sport 4.0L 5 speed with 135k miles and keep having an oil pressure problem. While warming up I have about 45-50psi of oil pressure at idle and when warm have about 25-30psi at idle. However, once the engine gets to 210° for the first time, while driving sometimes the...
  11. Mcnenc1

    Oil pressure drop

    Okay so I think I know what this is and how to fix it but before I do I wanted to hear your opinions. 2004 Jeep TJ Sahara 4x4. Automatic Oil pressure sits perfect while Rpms are higher than nuetral. But once I place the Jew in park OR I’m in drive and sitting at a red light my oil pressure...
  12. fourmustangs

    P0300 code and oil pressure gauge drops to zero at idle

    Because Jeep...... I have a P0300 code so its multiple misfies...but that is only code so doesnt specify a a cylinder. It doesnt run bad...it occasionally has a shimmy in the engine...would that be a whole coil pack to replace or still could be a vacuum leak? 2nd issue The oil gauge will...
  13. Forty

    Guage or sending unit

    Sooo every time I start my tj the oil pressure does not read at all, I shut her down and restart and it registers normal. This is how it goes every time without fail. I changed the sending unit so now I'm wondering if its the guage.
  14. T

    No oil pressure on gauge?

    Why would I not have any oil pressure but every other gauge works fine?