Question about 1992 Buick Roadmaster

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Flashig oil light

When i start car oil gauge shows normal oil level when i stop at red light or stop sign oil gauge shows low oil and oil light will flash on every few seconds once i hit the gas and start to go again oil gauge shows oil level is normal PLEASE HELP!! what is the difference between a oil pressure switch and a sending unit?

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  • dweed001 Oct 28, 2008

    I have a similar problem except that my oil light does not come on until after the engine heats up. This started after I replaced the oil with a 5W weight oil. A mechanic suggested that the oil may be too light and to replace with 10w. Haven't tried that yet, but was curious as to thoughts on this solution

  • dmowatt Nov 22, 2008

    When I start my 1992 Buick Roadmaster the low oil comes on but if I shut off the motor after it has warmed up and then restart it the light does not come back on. I have replaced the oil sender unit but it did not change. The oil pressure gauge shows good oil pressure.
    Thanks

  • yadayada
    yadayada Mar 10, 2014

    The oil is to thin replace it, the low pressure you have with a hot engine will destroy the bearings. Use 10-30W

  • Anonymous Mar 15, 2014

    i have a 2002 g.m.c. envoy , when i stop at a red light ., the dash says oil pressure low and stp engine . the oil gauge goes all the way to zero but goes back to normal as soon as you it the gas some say its the oil censor and someone said it was the oil pick up tube and you would have to pull the motor please help me

  • Anonymous Mar 15, 2014

    i have a 2002 g.m.c. envoy , when i stop at a red light ., the dash says oil pressure low and stp engine . the oil gauge goes all the way to zero but goes back to normal as soon as you it the gas some say its the oil censor and someone said it was the oil pick up tube and you would have to pull the motor please help me

  • Anonymous Mar 27, 2014

    the low oil pressure light came on i put oil in and now this chime will not stop it goes ding ding ding

  • Anonymous Mar 28, 2014

    instrament panel showing low oil pressure, oil light on....oil level is fine

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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.

Posted on Oct 10, 2008

  • 1 more comment 
  • yadayada
    yadayada Oct 13, 2008

    I am sure you have low oil pressure, I don't know why you don't accept my my suggestion, it could save you the cost of a new engine, I provided the correct information, sorry you feel it is incorrect, good luck with the problem and hope you resolve it soon.

  • Paula Kiely
    Paula Kiely Mar 10, 2014

    The car has 286,000 miles on it, everything in this car works perfectly. I just bought new struts for it and a new alternator. The body is beautiful, even the A/C works good. Maybe I am better off getting a new motor, I did some digging and a new motor will cost me about $300-$600 depending on the miles, what do you think

  • yadayada
    yadayada Mar 10, 2014

    I don't know that is a lot of miles, others things like ball joints body components and most all suspension parts (no just shocks) will at the end of their useable life span. My credentials, 30 years as a professional technician and 20 as a Master ASE certified Technician.

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My 2005 Envoy's low oil pressure light will come on when I am at a stop and my car is ideling. My oil gauge will also drop. I just change the oil and filter about 1 month ago


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Temp gauge works errtic on a 2001 optima but does not overheat


First check your coolant level. If it is low, look for leaks. Also don't rule out the reservoir isn't bad. Also if the hose is pinched to reservoir, this will cause low coolant in the engine.

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Oil light beep when stop at red light


It could be one or more of the following; clogged oil screen (pan must be removed), Excessive sludge or the oil pump. When the oil pump is going bad it shows at low rpms. ps it is also possible that your dipstick is giving a false reading- showing a false normal operating level. Good luck!

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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.

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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!

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1 Answer

My 2001 Chevy Suburban is making a loud ticking noise intermittently, it mostly happens at stop lights, but most especially when I start it in the morning. The oil pressure light and gauge show low to zero...


If the oil light and the gauge is showing low to zero pressure then you need to have the pressure checked by someone with a mechanical gauge to varify the pressure is low. Is the oil level at the full mark? I have seen where the oil pickup tube o ring gets hard over time and cracks which can allow the oil pump to draw in air and cause low oil pressure. If you run the engine with very low oil pressure for any length of time there is a chance that the engine may need to be replaced due to lack of lubrication. The chevrolet dealerships still provide very good service. Hope this helps.

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Engine oil level dosn't shown when i start the bmw 318 2003, it show nothing, but if the oil is in min it show yellow light, the red light dosnlt show when i start the engine as it was before.is it normal?


I recommend having the oil pressure checked by a technician with a pressure gauge. Lets make sure the pump is creating enough pressure. If pump checks out then its theoil pressure sending unit, gauge or the circuit

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1 Answer

My low oil pressure light has been coming on when I stop at a signal or stop sign, but than goes off when I start driving, I just had my oil changed a week ago


It sounds like your engine is low on oil. When you get home, turn your engine off, wait 5 minutes, the pull the dipstick and wipe it clean and re-insert fully, then pull the dipstick out again and look at the end of it; you will see the recommended level etched into the dipstick, if the oil level shows low (and it's a good bet it will), you need to add oil...and never use that shop again.

If the level is normal, the oil pressure sender may be faulty...ask your mechanic to check it and replace it if necessary.

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1 Answer

Oil light comes on when break then goes off


The oil light indicates that the engine's oil pressure has dropped below the minimum safe pressure. When the light goes out it suggests that pressure has been restored to a sufficient level for engine lubrication but this is nevertheless a bad sign.

I suspect that the oil level in the engine is too low and that the oil itself has greatly deteriorated and has not been changed for some time.

1. Check the oil level again, after the car has been standing for a few minutes, and make sure the engine oil level is at the maximum mark on the dip stick. If not then top it up.

2. Have the oil (and oil filter) changed in the car as soon as possible and ensure it is the correct spec viscosity oil for that engine .

3. Brake test the car to see if the oil light still comes on under braking.
If it recurs you need to have an oil pressure gauge hooked up to the engine (by an auto repair shop) to see what oil pressure is being achieved at various engine revs. If an independent gauge shows no problem with oil pressure then I would assume a faulty oil pressure sensor.
If the pressure gauge identifies a lower than normal oil pressure in the engine's lubrication system then the cause needs to be identified and fixed.

Sean

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