Question about 1987 Porsche 944

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Oil Pressure going up and down during acceleration and decel.

Oil pressure gauge is going up and down from 1 - 5. When you rev the engine the pressure goes up... WHY is that, is there something wrong with the pressure gauge or is it something to do with the motor, like maybe changing the oil again would help?

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Hi, this is a faulty oil pump and , it should be replaced asap. make sure the mechanic replaces the oil screen as well.

You can test the pressure gauge and True oil pressure by using the guide below.



Testing the Oil Pressure Gauge

* Test the gauge by grounding the wire that leads to the sending unit on the block.
* When the wire is grounded with the key switch on, the gauge should show maximum oil pressure, or the light should go on.
* If either happens, the gauge and wiring are good and the sending unit is at fault.

Testing Oil Pressure

Pressure can be tested by temporarily installing an oil pressure gauge in place of the sending unit. Before testing, look up the oil pressure specifications for your vehicle in the appropriate service manual.

* Bring the engine up to operating temperature.
* Now shut the engine off.
* Locate the oil pressure sending unit; usually it is on the lower side of the engine block.
* disconnect the wire from the sending unit and use an Open Ended Wrench to remove the sender. using pliers can damage the unit.

* Tighten the oil pressure test gauge into the hole in the block where the sender was removed.

* Check the engine's oil level and fill, if required.

WARNING
Be extremely careful when working near a running engine. Always wear safety goggles or glasses with side shields when working around moving machinery and be sure that your clothing is not loose.

* Now turn the engine on and check the oil pressure on the gauge.
o Watch as the engine warms to note any excessive drops due to temperature.
o Make sure the engine speed is set to specifications for testing pressure.
o if necessary, us a Tachometer and adjust the engine idle speed.
* Record the measured oil pressure, then turn off the engine.
* Compare the test results with the manufacturer's specifications.
o If the oil pressure is within specifications, this shows that the oil pressure sending unit may not be working correctly.
o In many cases, replacing the oil sending unit will correct the problem.
* After the test is complete, reinstall the oil pressure sending unit, start the engine, and confirm there are no leaks.

Posted on May 27, 2009

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Check your oil level in the engine. Oil pressure will read this way when the oil level is getting low...

Posted on May 27, 2009

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