Question about 1995 Buick Skylark

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No oil pressure

Could my oil sending unit be bad or the oil pump there are no oil leaks anywhere but i think thermostat is bad this started after the engine over heated i am going to replace the thermostat do you think that will help the oil pressure and what kind oil should i get

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  • 39 Answers

Does the engine make a bad noise, like it is not getting oil? If not, I would try replacing the oil pressure switch. I have had to do this twice in the past three years that we have owned my wife's 02 Buick.

Posted on Apr 27, 2013

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Posted on Jan 02, 2017

emissionwiz
  • 75814 Answers

SOURCE: 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.

Posted on Oct 10, 2008

daves944
  • 1050 Answers

SOURCE: Buick Regal dying

You have a problem in the fuel pump relay circuit for sure then. I'm betting the relay, but it could be that dropping resistor.

Posted on May 11, 2009

  • 118 Answers

SOURCE: where is the oil pressure sending unit located?

The pressure sending unit is located on the passenger side rear of the engine just above and slightly to the left of the filter and filter housing.

Posted on Aug 01, 2009

  • 66 Answers

SOURCE: 98 buick lesabre oil pressure dropped to 0 and

my sister had the same problem. There are 2 sensors that can cause this when they go bad. One is the oil pressure switch, which is located near the oil filter. When the PCM reads this switch, and gets a low reading, it will automatically kill the engine. The switch costs around $4.00 and is a 5 minute replacement job. The other possibility is that the crank position sensor has gone bad. When this sensor goes bad, the PCM can't read the appropriate speeds of the crankshaft, and will adjust the fuel and air mixture to compensate, often times the engine will die because it is getting insufficient fuel and air. The Crank position sensor is located on the engine block near the water pump. It is around $40.00 and at the most a 30 minute replacement job if you are unfamiliar with the process. I hope this helps. I'm a vehicle mechanic in the Air Force, with roughly 7 years of experience on the floor.

Posted on Dec 03, 2010

duane_wong
  • 6826 Answers

SOURCE: ok. guys. i am losing coolant. it is not showing

If the coolant is leaking at the head gasket or the intake manifold gasket slowly, then new gaskets will have to be installed. The bubbles coming up is a bad sign that the seal of the coolant system is bad or it's overheating the coolant to the point that it boils over.

The overheating may be due to air or vapor in the cooling system not allowing fluid to flow freely.

Did you put a 50/50 concentration of coolant to water into the cooling system?

Also, check the fan to see if it is turning on when the car is at operating temperature at idle.

May need to be flushed out and new coolant installed to increase cooling efficiency.

Good luck on this repair.

Posted on Jan 14, 2011

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1 Answer

Cars no oil pressure


One of three things have happened. You may have either a bad gauge, bad sending unit or your oil pump gears have become too worn to pump oil. There are a couple other possibilities, but I have listed the main three. The others would be bad main bearings in the engine, a plugged oil port or your sensor wiring has become damaged. You have to look at the issue logically and think about what was worked on last in your car and did it have anything to do with the oil sensor system or was the repair anywhere near the oil sensor wiring? The other thing to think about is did this just happen all of a sudden or did the pressure drop gradually? A gradual drop would indicate mechanical failure, where a sudden failure would indicate electrical failure. This would be the preferred answer because a mechanical failure of your oil pressure would be very costly.

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Oil sensor on dash keeps fluctuating from empty to normal, warning lights come on when on 0, then go off when indicator returns to normal oil range


  • You have an oil pressure sending unit on your oil pan, just above the oil filter that could be going bad. Of course the oil pump could be going bad also but you can check the sending unit at home.
  1. First check your oil level to make sure enough oil is circulating.
  2. Now look at the oil sending unit and inspect to make sure the wires and connector look good.
  3. Note that in the next step when you remove the connector, turn the car to on NOT START JUST ON and have a quick look at the gauge inside the cabin. It should be all the way up. If not you could have a connector problem.
  4. To remove the oil sending unit by removing the connector and putting the proper deep socket on and twisting it out.
  5. Now put an oil pressure gauge in where the sending unit was and start the car. Make sure there are NO leaks and now watch the gauge.
  6. Now start the car and wait two minutes (roughly). If the pressure goes up to 50lbs (roughly) and stays then the sending unit itself is bad and needs replaced. Only let the car run lon enough to get a good reading then turn it off.
  7. If the pressure is low and won't come up after a couple minutes of running then your oil pump could be failing.

  • Hope this helps and thank you for using FixYa.

Regards, Tony

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Low engine oil pressure on a 1997 cadillac catera. I suspect the sending unit. Would like to check with a manual gauge. Where to tap in to engine oil pressure?


in order to check the oil pressure, you have to remove the oil sending unit, then screw in the adapter of the oil pressure gage, and then remove the start relay or fuel pump relay from the fuse and relay box, under the hood on the drivers side, and then crank the engine over 3-4 turns, and then record the oil pressure, and then disconnect the oil pressure gage, and then re install the oil sending unit, replace the start relay or fuel pump relay, and then start up the car, and check the oil sending unit , to make sure it is not leaking, if your oil pressure checks out within the specs, then you are fine, if it gives you a low reading, then you could have a bad oil sending unit , or a oil pump going bad on you. i would replace the sending unit first, then see what the gage shows.

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spend the 12 dollars and get a universal mechanical oil pressure gauge, remove the oil sending unit on truck and screw new gauge into and start truck. Does it read pressure? I know people will say just replace oil sending unit but i like to visually check for a true oil pressure than to trust a light, at least you will know what pressure your motor has. if you have pressure then replace the sending unit. Most of the time when the sending unit goes bad your oil pressure gauge in the truck will run at 80 psi all the time. Since you have a light the sending unit just says it isn't getting pressure which turns a light on. So be safe and do as i suggest, if there is no pressure at the mechanical gauge then i hate to say it but you may have a bad oil pump. I honestly just think you have a bad sending unit,if you want just replace it and if lights go off thats good, but you still don't know what the pressure is and if you feel comfortable with this then do so.

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Oil pressure at zero


its possible that the oil gauge go to bad, the oil pressure sending unit may have gone bad, the oil pump may have quit. I suggest you find the oil pressure line coming off engine, put another oil pressure gauge on it and then just crank the engien to see if you get any oil pressure whatsoever.


If you don't, then I would check the oil pressure sending unit next before I tore the oil pan off to examine the oil pump itself. Whatever you do, do not run the engine with zero oil pressure otherwise you will seize up the engine and that will cost big bucks to repair.

Hope this heslp (remember to rate this answer)

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3 Answers

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You oil pressure sending unit has gone bad, it's common to go bad and some even leak oil. 
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