Oil pressure goes up then all the way down on gauge? Car runs and starts. How hard is it to replace the oil pump
What you really want to do is have a technician remove the oil sending unit and attach a pressure gauge of known reliability. Only then can you know if your pressure is good or bad.
If you have to change an oil pump, you can have problems reaching it. You may be able to find a Video or text online for your exact model. The Capri series covers a lot of Years and the engines may be different and one year may be a front wheel drive while an older one may be rear wheel drive.
One of the biggest problem is having clearance to remove the oil pan. Sometimes in the closest clearances turning the crankshaft can help make room to drop the oil pan.
Front wheel drive units can have a cradle which blocks pan removal. You need to find out the requirements for your exact year.
The pressure test will help diagnose other problems. Bad bearings can leak so much oil that pressure will behave exactly like you describe.
SOURCE: Oil pressure gauge
Low oil pressure is generally caused by internal engine bearing wear, not a "bad" oil pump... Pumps become "bad" when debris from a failed component gets into it, causing damage. (exception being pressure regulator spring/plunger assembly becoming clogged with gunk in engines that do not get proper maintenance; likely not your case)
Were there any tapping noises coming from engine when pressure was low? If not, The most common problem is the pressure sending unit, sending bad info to the warning light. If passage going to it or internal passage is gunked up, this problem usually disappears when oil is changed. sometimes the sender just goes bad, in which case, change it.
To get a proper diagnosis on your problem, have someone put a mechanical oil pressure gauge on it. This will read the actual oil pressure and will tell you a lot about the condition of your engine!
I have never seen a valve job that corrected any oil pressure problem. I mistrust anyone who would even think that!!!
Mlinimum low pressure at idle is 15 psi Max is about 60psi running (higher can explode an oil filter) A reading of 15psi indicates the beginning of a problem. although considered "safe" it is not good.
SOURCE: 2000 Bonneville oil pressure gauge reads 120psi???
Has it always been like that, or just since the oil change?
SOURCE: Oil Pressure going up and down during acceleration and decel.
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.
SOURCE: Oil pressure gauge
the solutionit is the oil pump sensor (if gage goes up and down and gage light blinks).
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