Question about 1997 Jeep Wrangler

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Oil gauge goes up and down.

I have a 1997 jeep wrangler. The oil gauge goes up and down when I drive. It has oil and I already changed the oil sensor.

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  • mtlabella Apr 19, 2009

    should I change the oil pump in this case?

  • Anonymous Mar 12, 2014

    The check gauges light on my 2004, 4.0 Jeep Wrangler comes on and the amp gauge goes from 14 to about 15 and then comes back down, then back up, repeatedly. Then light goes out and it stays on 14 for awhile. Then it starts over again.

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  • Jeep Master
  • 6,982 Answers

If grounding the dash does not work, try putting a mechanical gauge on it and reading actual oil pressure. Pressure does change while driving, but should not wander. With mechanical gauge, check that running hot at idle (in gear if automatic) pressure should not drop lower than 15psi (I'd rather see 20) High reading should be around 40 -50 but no higher.Low pressure indicates a loss of supply or bad bearing on the crankshaft, high pressure may be caused by sticking pressure relief or restriction in an oil passage.

Posted on Apr 19, 2009

  • Richard Scordino Apr 19, 2009

    Oil pump is the first item to get oil and the last not to. In low oil pressure situations, generally the pump is not the cause, : oil escaping past a bad bearing is the cause. It's good to change the pump when changing a bearing but foolish to change the pump by itself, which at best will temporarily give only slightly better pressure.
    If flow to pump is restricted because of carbon on the pump pickup screen, then clean the screen off.
    First though you need to find out what real oil pressure is otherwise you cannot plan any real repair.


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