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CPR plugs are closed but pump keeps indicating low pressure alarm.

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SOURCE: 2006 Impala 3.9 low oil pressure alarm

has a bad oil sending unit,try to replace the oil sender and it sound fix the problem,thanks robert b.

Posted on Jun 19, 2009

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1 Answer

Lifters


Lifter noise is an indication of low oil pressure, that can be from low oil level and other things like a defective oil pump or plugged oil passages or excessive engine main and rod bearing clearances. Please have the oil pressure checked with a special tool, DO NOT DRIVE THIS WITH LOW OIL PRESSURE.

Jun 11, 2013 | 1999 Jeep Grand Cherokee

3 Answers

Alarm warning system on '02 Mercury Mariner 150HP E.F.I.-


Engine tank should be plumb full tight. The engine supplies about 2 lbs pressure through one of the 2 lines going to the boat tank. The other line takes the oil to the engine tank. If that line gets kinked or pinched, the engine tank won't get oil, a check valve lets a little air into it, and the oil pump keeps getting oil. When it goes down just a little, the alarm goes off telling you something is wrong.

Sludge in the boat tank could plug up the pickup screen. I've also seen them plugged up by a foil oil bottle seal carelessly dropped into the tank.

Once you find out why the oil couldn't get there, start the engine with the cowl off and loosen the cap on the engine oil tank until it leaks, then tighten it down and clean up the mess. That tank is normally plumb full tight.

If when the engine is running, you crack the cap on the boat tank, you should hear pressure let off. If the cap leaks, it won't build up pressure. If there is pressure, the oil line is plugged or kinked.

If pressure isn't supplied, the problem would be the crankcase check valve on the engine, lower forward starboard side, with the hose going to it.

hope it helps

Jul 05, 2008 | 2002 Mercury Mariner

1 Answer

Oil pressure indicator lamp illuminates intermittently


1. check oil level now! If low, add as needed, and keep checking regularly.
2. If level is OK, check oil pressure switch (or sending unit), and the connections at the switch.
3. Have the oil pressure measured by a good mechanic. If the pressure is good, it means that the problem lies somewhere in the pressure sensor or indicator circuit. If the pressure is low, there is a problem in the engine - either a clogged oil filter, bad oil pump, or blockage within the engine.

Nov 28, 2011 | 2002 Jeep Liberty

1 Answer

We just changed the oil in our BMW 745li and it keeps on saying that the oil pressure is low. How do we turn it off? Or what might be the problem?


The most common cause of no- or low- oil pressure indications isn't the failure of the oil pump or a blocked filter (these all have bypasses) but the failure of the sender/sensor providing the input for the sensing circuit. Apparently, this also applies to the top-end cars as well. Oil pressure gauges showing an actual range of pressures are far more reliable but more costly to make.
The majority of sensors used are primitive devices using a disk of metal that 'clicks' at pressures above a few pounds to keep the warning away and when these fail, they generally close a conductive path to 'send' the no- or low- pressure signal for the warning.
These are normally not costly items to replace.

Sep 05, 2011 | BMW 7 Series Cars & Trucks

1 Answer

My 95 jeep grand cherokee limited is shutting down while driving suddenly. It looks like it happends after more than 30 min driving or when it runs in the same speed for several min. Any one have any idea...


SYMPTOM/CONDITION:
Symptoms may include no start, rough idle, long crank times, driveway die outs or erratic fuel pressure. A new fuel pump has been released which delivers improved performance. This pump should be used whenever fuel pump failures are encountered.
DIAGNOSIS:
Basic fuel system diagnostics should be used as outlined in the appropriate service manual. A brief recap of the basic diagnostics follows:
Fuel pressure specification - 49 psi - plus or minus 5 psi.
High fuel pressure indicates problems with the fuel pressure regulator. Refer to the service manual for regulator diagnosis. Do not replace the fuel pump for high pressure.
Low fuel pressure - Low pressure could indicate a pump problem or it could indicate a plugged fuel filter or restricted fuel line or no fuel in the tank. Be sure to check these items before replacing the fuel pump.
Fuel System Leak down - When checking fuel pressure be sure to check the integrity of the system after shut down. With the fuel pressure gauge connected, shut the engine off and observe the pressure gauge. The system should maintain at least 24 psi for five minutes after shut down. If the pressure bleeds off quicker, it could indicate that an injector is leaking down or that the pressure regulator is leaking. This can lead to driveablity problems and require further diagnosis.
NOTE: IN RARE CASES WHERE MULTIPLE FUEL PUMP FAILURES HAVE OCCURRED ON THE SAME VEHICLE, A BUILD UP OF RESIDUE MAY HAVE ACCUMULATED ON THE INSIDE OF THE FUEL TANK. THE PRESENCE OF THIS RESIDUE IS NOT EASILY IDENTIFIABLE. THE RESIDUE CAN PASS THROUGH THE IN TANK FILTER AND CONTAMINATED THE PUMP ROTOR. IF MULTIPLE FAILURES HAVE OCCURRED WITH NO OBVIOUS INDICATION OF THE CAUSE, CONSIDERATION SHOULD BE MADE TO REPLACING THE FUEL TANK TO AVOID FUTURE PROBLEMS. PARTS REQUIRED:
I would start here and look at your fuel system closely

Nov 12, 2010 | 1996 Jeep Grand Cherokee

2 Answers

Oil gauge keeps coming on, loss in oil pressure


low oil pressure,mainly its thin dirty oil, pump needs servicing/replacing,pressure release spring,weak

Jul 05, 2010 | 1999 Toyota Camry

1 Answer

Oil indicator light keeps flashing and eventually sounds a beeping alarm. Only thing is there is the correct amount of oil in the car. Been to garage and they checked level. Is this simply a switch problem...


The only way to tell for sure is to temporarily install a mechanical pressure gauge and read the actual pressure. That will determine the next course of action--replace the pressure sensor/switch, or recommend remedial action within the engine itself (worn bearings, worn oil pump, or plugged intake screen). Hope this helps!

May 24, 2010 | 1995 Volkswagen Golf

2 Answers

What does a low oil pressure alarm mean


It means the sensor that detects your oil pressure has seen a situation where the oil pressure is too low and engine damage will result. Could be just a bad sensor, but better have it checked with a mechanical gauge to see exactly what the pressure is.

Jan 10, 2010 | 2001 Pontiac Montana

1 Answer

Very low oil pump preasure


Hi Noby!

I gather from your multiple posts with the same problem that you weren't able to locate an Isuzu cargo truck in the "Add Specific product" window... but I'm assuming you have one with diesel engine and your problem is a low oil pressure indication.

First, you need to make sure there is the proper amount of oil in the crankcase... so check the oil, add if needed, then see if the problem persists.

If so, verify that there actually is a low il pressure condition and this is not just a faulty indication. If you have a mechanical oil pressure gauge, we'll assume it is accurate... but if it is electrical, you will need to obtain a service pressure gauge. When you have this, remove the oil pressure sending unit from the engine block, and with the right adapters, fit the service gauge to the sending unit hole... then check the oil pressure situation with the more accurate service gauge. Note if the low oil pressure is only at idle, or if it persists throughout the RPM range.

If the low oil pressure clears at RPM, you probably have a problem in the oil pump (worn) or oil pressure relief valve (stuck), but that is usually a part of the pump assembly.

If the low oil pressure is persistent throughout the RPM range, the possible causes still include the pump but also take in loose crankshaft main or rod bearings or possibly an internal leak in the pressurized oil galley circuit, such as a lost galley plug (metal plug used to close the hole where the internal oil passage was machined/drilled). And there are other possibilities...

A temporary help with this problem is to go to a higher viscosity (thicker) oil, and do a filter change when the oil is changed. The thicker oil does not escape loose bearing fits as easily, thus helping build pressure.

Hope this is illuminating and helpful, and good luck with the problem. Do not hesitate to post further questions or comments an let us know how it goes...

Thanks!
WildBill

Jun 18, 2008 | 1985 Chevrolet Camaro

2 Answers

Very low oil pump preasure


Hi Noby!

I gather from your multiple posts with the same problem that you weren't able to locate an Isuzu cargo truck in the "Add Specific product" window... but I'm assuming you have one with diesel engine and your problem is a low oil pressure indication.

First, you need to make sure there is the proper amount of oil in the crankcase... so check the oil, add if needed, then see if the problem persists.

If so, verify that there actually is a low il pressure condition and this is not just a faulty indication. If you have a mechanical oil pressure gauge, we'll assume it is accurate... but if it is electrical, you will need to obtain a service pressure gauge. When you have this, remove the oil pressure sending unit from the engine block, and with the right adapters, fit the service gauge to the sending unit hole... then check the oil pressure situation with the more accurate service gauge. Note if the low oil pressure is only at idle, or if it persists throughout the RPM range.

If the low oil pressure clears at RPM, you probably have a problem in the oil pump (worn) or oil pressure relief valve (stuck), but that is usually a part of the pump assembly.

If the low oil pressure is persistent throughout the RPM range, the possible causes still include the pump but also take in loose crankshaft main or rod bearings or possibly an internal leak in the pressurized oil galley circuit, such as a lost galley plug (metal plug used to close the hole where the internal oil passage was machined/drilled). And there are other possibilities...

A temporary help with this problem is to go to a higher viscosity (thicker) oil, and do a filter change when the oil is changed. The thicker oil does not escape loose bearing fits as easily, thus helping build pressure.

Hope this is illuminating and helpful, and good luck with the problem. Do not hesitate to post further questions or comments an let us know how it goes...

Thanks!
WildBill

Jun 18, 2008 | Isuzu Trooper Cars & Trucks

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