Question about 2000 Jeep Grand Cherokee

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Low oil pressure on 99 jeep grand cherokee

At idle, pressure will go to 0, rev the engine and the pressure will go up. Recently pressure will increase slightly after rev. Is this the sender or the oil pump

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  • mygirls0_0 Mar 16, 2009

    I have the same problem on my 2000 Grand Cherokee when you idle it goes to zero and then when you run down the road about 50MPH if comes back up.....

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Change your oil,it could be too thin,see if that fixes it

Posted on Jan 17, 2009

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This is a Combination of Both. Replace the Sender first as this is the Cheaper of the two. If not you will need the Oil Pump.

Posted on Jan 17, 2009

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Sounds more like the oil pump... two things... first I wouldn't be driving that vehicle untill it's been fixed....second how many miles on the jeep ?

Posted on Jan 17, 2009

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1 Answer

2006 Chrysler 300M 5.7 Hemi, all of a sudden the oil pressure has dropped to "0" when in idle or at a stop sign, and the light comes on, then when accelerated the light goes out and pressure resumes, and...


The check engine light means there is a trouble code stored in the car's computer. The first thing is to get this read out, to home in on the problem. Autozone will do this for free I believe.

It is not uncommon for the oil light to flicker at idle when hot, as long as the pressure rises OK at revs. Get an oil pressure reading done by temporarily replacing the pressure sender unit with a pressure gauge, and you can then tell if there is a problem in that area.

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It could also be a faulty sender unit on the engine, a worn oil pump, or a faulty oil pressure relief valve on the oil pump or in the filter.

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Hi there:
It sounds like it could be oil pressure sending unit. I would check the connection on the sending unit. Below are the procedures for checking the sending unit, If it checks out good I would have a mechanical gauge set up to measure the pressure.

TESTINGTo test the normally closed oil lamp circuit, disengage the locking connector and measure the resistance between the switch terminal (terminal for the wire to the warning lamp) and the metal housing. The ohmmeter should read 0 ohms.To test the sending unit, measure the resistance between the sending unit terminal and the metal housing. The ohmmeter should read an open circuit (infinite resistance).Start the engine.Once again, test each terminal against the metal housing:The oil switch terminal-to-housing circuit should read an open circuit if there is oil pressure present.The sending unit-to-housing circuit should read between 15-80 ohms, depending on the engine speed, oil temperature and oil viscosity.To test the oil pressure sender only, rev the engine and watch the ohms reading, which should fluctuate slightly (within the range of 15-80 ohms) as rpm increases.If the above results were not obtained, replace the sending unit/switch with a new one.

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It sounds as if the clearance that the bearings normally run in have been surpassed and need to be replaced. Higher engine revs will supply extra oil which will overcome any small discrepencies but constant running at this stage will result in faster degradation of all engine components concerned resulting in a more expensive repair. Shes basically worn out.

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GM Bonneville/Eighty Eight/LeSabre 1986-1999

Oil Pressure Sender

OPERATION
The oil pressure sender/switch relays the engine oil pressure to the dash gauge.

TESTING

  1. To test the normally closed oil pressure lamp circuit, disengage the locking connector and measure the resistance between the switch terminal (terminal for the wire to the warning lamp) and the metal housing. The ohmmeter should read 0 ohms.
  2. To test the sending unit, measure the resistance between the sending unit terminal and the metal housing. The ohmmeter should read an open circuit (infinite resistance).
  3. Start the engine.
  4. Once again, test each terminal against the metal housing:
    1. The oil switch terminal-to-housing circuit should read an open circuit if there is oil pressure present.
    2. The sending unit-to-housing circuit should read between 15-80 ohms, depending on the engine speed, oil temperature and oil viscosity.

  5. To test the oil pressure sender only, rev the engine and watch the ohms reading, which should fluctuate slightly (within the range of 15-80 ohms) as rpm increases.
  6. If the above results were not obtained, replace the sending unit/switch with a new one.
REMOVAL & INSTALLATION(see Figure 1)
  1. Disconnect the negative battery cable.
  2. If necessary for access, raise and safely support the vehicle.
  3. If necessary, drain the engine oil into a suitable container.
  4. Detach the switch electrical connector.
  5. Remove the switch.
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Fig. 1: Location of the oil pressure switch - 1995 vehicle shown, others similar

To install:
  1. Coat the first two or three threads with sealer. Install the switch and tighten until snug. Engage the electrical lead.
  2. Carefully lower the vehicle.
  3. Fill the crankcase with the proper type and amount of engine oil.
  4. Connect the negative battery cable.

Hope helps with this (remember rated this help) Good luck.

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