Question about 1985 Toyota Land Cruiser

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FJ75 My oil pressure gauge (Dash) will register as full when you first turn on ignition. It then falls to low and stops working. Any suggestions?

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SOURCE: Toyota Hilux rev gauge,radio,windscreen wipers,oil gauge stopped

check fuses first

Posted on Feb 19, 2009

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SOURCE: Oil pressure guage shows low to nothing

Hi there
You should check the oil pressure sensor/wiring should be located around the oil filter area usually.
If you can't see any obvious issues than post another question with you progress and ill help you work through it...

Posted on Mar 22, 2009

  • 154 Answers

SOURCE: 93 Toyota 4 Runner oil pressure guage very low at idle

no problem,,, it;s ok...

Posted on Aug 18, 2009

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SOURCE: oil gauge keeps coming on, loss in oil pressure

your oil pump may be starting to fail on you. once it's gone you will have no oil pressure at all and you run the risk of overheating the engine. monitor your guages closely.

Posted on Jul 05, 2010

  • 192 Answers

SOURCE: 22re engine , I replaced the oil pressure sending

Either the gauge itself is bad or the ground is insufficient. Start by checking the ground first. That`s free.

Posted on Feb 01, 2011

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1 Answer

WHATS A OIL SENDING UNIT


it is a pressure sensitive unit in the side of the block that register oil pressure in the oil galleys of the engine
in vehicles with an oil light only it will switch off once a preset pressure is reached and turn back on when the oil pressure falls below that pressure
on other vehicles with an oil pressure gauge, it is a variable resistor unit that changes the resistance of the power from the gauge as the oil pressure fluctuates so altering the reading on the gauge
it is a different unit to an oil pressure sensor which conveys readings to the ECM

Apr 28, 2015 | Cars & Trucks

1 Answer

Have a gauge hooked up to low pressure fuel pump and it shows it works but high presssure one doesnt


Check to see you have oil up to full on dipstick . The high pressure pump picks up oil at the top level so if oil starts to get to low engine will stop before engine damage . The high pressure pump is what makes the injectors fire . Also check the wires that go thru valve cover some times they burn up and you can smell the burn thru the oil filler cap .

Apr 05, 2014 | 1996 Ford F350 Crew Cab

1 Answer

Oil pressure guage not registering


The oil pressure gauge on a 2004 WJ doesn t really show the pressure, but it will go to a preset value when pressure is ok, or it will stay at o PSI. So you need a pressure switch on this jeep and not a pressure sending unit. If the right unit is installed, then or the pressure indicator is faulty, or wiring. Do a test of the instrument panel to see if the indicator works: ignition switch in off, press the odometer reset button and now switch ignition in run. Instrument panel will start a self test, all lights will come on and all meters will go full scale and return to normal.

May 20, 2013 | 2004 Jeep Grand Cherokee

2 Answers

How can i fix the oil pump


see this tips and fix it. God bless you
The oil pump supplies oil to lubricate your engine. If the oil pump is worn or is not turning, the engine will suffer a loss of oil pressure, which may result in engine damage or engine failure.
The first sign of trouble may be a low oil pressure warning light, a drop in the normal reading on you oil pressure gauge (if your car has one), or the appearance of ticking or clattering sounds from your engine.
As a rule, most engines only need about 10 PSI of oil pressure for every 1,000 RPM of engine speed. Oil pressure will read higher than normal when a cold engine is first started because the oil is thick. Oil pressure will gradually drop as the engine warms up and the oil thins out. So normal oil pressure on a warm engine cruising down the highway is typically 30 PSI up to 45 PSI.
SYMPTOMS OF OIL PUMP TROUBLE
The first thing you should do if any of these symptoms occur is to stop your car, turn off the engine, let it sit for a few minutes, then check the oil level on the dipstick. If the oil level is at or below the ADD line, add a quart of oil to bring the level back up to the full mark. Add as much oil as is needed to raise the level to the full mark. Then restart the engine. If the warning light remains on, or the oil pressure reading does not climb back up to its normal range, or the engine noise does not go away, you may have a bad oil pump.
The other possibilities include a bad oil pressure sending unit, or a problem with the oil pressure warning light circuit or oil pressure gauge.
OIL PRESSURE SENDING UNIT
If the engine is NOT making any unusual noises and seems to be running normally, and the oil level on the dipstick is FULL, but you are still getting a low oil pressure warning light or low gauge reading, the fault could be a bad oil pressure sending unit.
The oil pressure sending unit is mounted on the engine block. On some applications, there is a spring-loaded pressure-sensitive diaphragm with a switch inside the sending unit. This switch completes the circuit to the low oil pressure warning light if oil pressure drops below a certain threshold. The unit may stop working if the diaphragm inside fails, if the switch is stuck, if the small hole that allows oil to enter the sending unit becomes plugged, if there is a loose, corroded or broken wiring connector at the sending unit, or there is a fault in the wiring circuit between the sending unit and warming light.
On vehicles that have an oil pressure gauge (electronic, not mechanical), the oil pressure sending unit has a small rheostat inside that sends a variable voltage signal to the oil pressure gauge when the diaphragm moves. A worn spot on the rheostat or any of the other problems just described for the simple pressure-type oil pressure switches can cause a problem.
FORD'S FAKE OIL PRESSURE GAUGE
On many Ford vehicles that were built from 1980 through the 1990s, the oil pressure sending unit has two switches, a low pressure and a high pressure. These vehicles also have an oil pressure gauge, but the reading on the gauge is not a true indication of real oil pressure. As long as the pressure to the sending unit is between high and low, the gauge will read normal. If oil pressure drops and trips the low pressure switch, the dash gauge will now read low. Or, if oil pressure goes up and trips the high switch inside the sending unit, the dash gauge will read high. Consequently, don't rely on the oil pressure gauge for an accurate reading in these vehicles. It is only a gross indication if the oil pressure is low, normal or high.
OIL GAUGE PROBLEMS
If the engine is NOT making any unusual noises and seems to be running normally, the oil level on the dipstick is FULL, and you have replaced the oil pressure sending unit but are still getting a low oil pressure reading on the dash gauge, the fault could be in the wiring circuit between the sending unit and gauge, or the gauge itself might be bad.
Check the wiring connections on both ends as well as wiring continuity between the sending unit and gauge. If no wiring faults are found, hook up a pressure gauge directly to the oil pressure port on the engine and check oil pressure with the engine running. If the engine-mounted gauge shows normal oil pressure but the dash gauge is reading low, the problem is a bad dash gauge.
On the other hand, if the engine-mounted pressure gauge reads low and you have done all of the above, chances are the oil pump is worn, or it is not picking up enough oil because of a restriction or blockage in the pickup screen in the bottom of the crankcase.
OIL PUMP PICKUP PROBLEMS
The pickup tube has a screen on the end to prevent large chunks of anything bad that ends up in the crankcase from being sucked into the pump. But we are talking BIG chunks of debris, not normal wear particles or carbon or dust or other microscopic-sized abrasive particles that can cause pump wear over time.

Sep 28, 2012 | 1996 Toyota Tercel

3 Answers

Oil pressure drop with engine getting hot


You'll want to remove the electrical oil pressure gauge and check the oil pressure with a manual gauge to verify low oil pressure. If the oil pressure tests good with a manual gauge, then you either have a faulty oil pressure sender, or gauge in the dash (I rarely see faulty gauges). If the pressure is still low, suspect worn crankshaft bearings. There is also a possiblity that the screen to the oil pump is clogged. This can be visually checked by removing the oil pan and cleaned.

Aug 14, 2012 | 1989 Ford Ranger

1 Answer

Oil pressure high, oil level low


Oil pressure and oil level are two different creatures.

your oil gauge determines oil pressure while the oil can (red light on dash) indicates oil levels.

There are usually two different sensors but can gauge the same types of things. E.G. - If your oil is so low that your pressure gauge is affected this can cause engine failure. Thus--a good rule of thumb is to check your oil once a week as the oil pressure gauge and red oil can may not always work as intended.

I hope this helps!

Aug 13, 2012 | Cars & Trucks

1 Answer

I have 55,688 miles on my 2003 CTS. The low oil pressure/stop engin warning light comes on after I have been driving for 20 minutes or so only when car is idling at stop signs. The oil registers full and...


The oil pump could be bad, or going bad. Oil pressure is effected by wear on the crankshaft main bearings and camshaft/s bearings. If those bearings are bad, that would make it lose oil pressure, but I wouldn't think it's time for a new motor at that mileage!!! I would find out what the actual oil pressure is, using a "wet gauge" or oil pressure gauge. The oil pressure sending could also be bad, giving false readings.

Oct 20, 2010 | 2003 Cadillac CTS

2 Answers

Low oil pressure no start


CHECK ENGINE OIL LEVEL ON OIL DIP STICK.OIL LEVEL SHOULD BE ON FULL MARK IF NOT ADD OIL UNTIL YOU GET TO FULL MARK.IF OIL LEVEL OKAY.YOUR LOW OIL PROBLEM CAUSED BY WORN DAMAGED OIL PUMP OR WORN ENGINE CRANKSHAFT BEARINGS.IF OIL HAS NOT BEEN CHANGED A LONG TIME CHANGE OIL AND OIL FILTER NOT GUARANTEE TO FIX PROBLEM.BUT COULD BE MINOR THING.OIL FILTER COULD BE STOPPED UP.WEAKEN OIL FLOW BUT LIKE I SAID PROBLEM COULD BE OIL PUMP OR ENGINE BEARINGS.REMOVE OIL SENDING UNIT SCREW IN A OIL PRESSURE GAUGE.TURN ENGINE OVER SEVERAL REVOLUTIONS TO SEE IF OIL PRESSURE BUILD UP TO 40 LBS. SEE 40 - 60 PSI. 2000 RPM.IF NO OIL PUMP TO WEAK .IF OIL PRESSURE RISES WHEN TURN ENGINE OVER.I HAVE SEEN FAULTY OIL PRESSURE SENDING KEEP ENGINE FROM RUNNING BECAUSE OIL PRESSURE SENDING UNIT WILL DISABLE FUEL PUMP RELAY TO KEEP FROM DAMAGING THE ENGINE.

Sep 23, 2010 | 2003 Lincoln Navigator

2 Answers

Oilpressure gauge indicates low to almost no oil pressure


You may want to hook up an external oil pressure gauge
to the engine to ease your mind. This would give you a regular number of the pressure. Compare it to the factory gauge in the dash. Those in dash gauges were not all that precise. If the engine is not having bearing noise I can see nothing to worry about.

Mar 16, 2010 | 1992 GMC Sierra K1500

1 Answer

Flashig oil light


You either have a loose/worn engine bearing or a worn out oil pump, do not drive the car this way, you will cause serious damage to the whole engine. A oil switch is for a light, it turns on the light when oil pressure falls below about 10 PSI, a sending unit is for a guage that shows oil pressure with a scale, it may have numbers on the guage or just green and red, or high and low.

Oct 10, 2008 | 1992 Buick Roadmaster

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