Question about 1992 Buick Roadmaster

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OIL LIGHT what is the difference between a sending unit and a oil pressure switch.i post another problem please help

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The sending unit is the one attched to either the oil pan or the top of the engine block near the intake, it tells the engine what your oil pressure is.

The oil pressure switch is the component that will shut your car off if the oil pressure gets to a dangerous low or high.

Note: If one or the other of these are not working, it can make your car putt, make the gauge stop working and even in some cases the car may not start at all, or start then shut down.

Always reset your computer after replacing any electrical parts.

you do this by taking the positive battery cable off for 10 mins.
this resets your computer back to 0's.

Posted on Nov 26, 2008

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2 Answers

On the 2004 Chevy Malibu where is the oil pressure switch


If your talking about oil pressure switch in parallel with fuel pump relay, doesn't apply with this vehicle. Note the diagram, I looked at info for the 3.5L engine. Check applicable fuses. If you have different engine, let us know. Are you missing anything else? Engine cranking you have spark and fuel injector pulse? Included is location of oil pressure switch for 3.5L
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May 07, 2016 | Cars & Trucks

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Where is the oil sending unit on a 1996 mercury cougar xr7 ? Its cause my oil pressure gauge is bouncing up and down...i dont know why...can anybody please help me thank you so much


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The low oil pressure warning lamp will illuminate anytime the ignition switch is turned to the ON position without the engine running. When the engine is running, the light also illuminates if the engine oil pressure drops below a safe oil pressure level. To test the system, perform the following:
If the oil pressure light does not work, perform the following:
  1. Turn the ignition switch to the ON position.
  2. If the lamp does not light, check for a broken or disconnected wire around the engine and oil pressure sending unit switch.
  3. If the wire at the connector checks out OK, pull the connector loose from the switch and, with a jumper wire, ground the connector to the engine.
  4. With the ignition switch turned to the ON position, check the warning lamp. If the lamp lights, make sure the oil pressure switch is properly grounded in the cylinder block, and if so replace the oil pressure switch. If the lamp still fails to light, check for a burned out lamp or disconnected socket in the instrument cluster.
To diagnose an oil pressure light that stays on, perform the following:
  1. Check the engine oil level and top off as necessary. If the engine was 2 or more quarts low on oil, test start the engine after topping off the oil level and recheck the oil pressure light operation. If the light stays on, stop the engine immediately and go to the next step.
  2. Disconnect the wire at the sending unit, then turn the ignition switch to theON position. If the light remains on, check the wire from the sending unit to the gauge for being shorted to ground and repair as necessary. If the light goes out, turn the ignition switch OFF and go to the next step.
  3. Replace the oil pressure sending switch with a known good switch.
  4. Start the engine and check the oil pressure light operation. If the light stays on with the engine running, stop the engine immediately to avoid severe engine damage until the cause of the problem can be determined.

WARNING
If the oil pressure light remains on while the engine is started, stop the engine immediately. Do not operate the engine until the cause of the problem can be determined. Operating an engine with low oil pressure will cause severe internal damage.

Possible causes for an oil pressure light to stay on are:


Pinched or grounded sensor wireDefective oil pressure sending unitRestricted or severely leaking oil filterExcessive internal engine bearing clearance.Insufficient or severely contaminated engine oilBlocked oil pump pickup screen or severely worn oil pump

Mar 31, 2016 | Mercury Cars & Trucks

1 Answer

Oil sensor and oil sending unit


Yes.
The difference is between these and an oil pressure switch which is used on vehicles with an oil pressure warning light.

Jul 12, 2012 | 2003 Dodge Durango

1 Answer

Oil light blinks on and off could pressure switch be bad if so where is it located on a 2000 ford windstar 3.0


Oil Pressure Switch Operation:
00134_oil_pressure_switch_gauge.jpgInformation relay unit for the indicator light or gauge on instrument panel. It contains a diaphragm that responds to changes in oil pressure. When the oil level is over a pre-set limit, the diaphragm opens the switch, turning off the light. When level is below the pre-set limit, the dash light comes on. In later model cars, if the oil pressure drops, the switch turns off the fuel pump, to stop the engine and limit damage to internal parts. Oil pressure switches can be grouped into two categories, units for electrical gauges and for mechanical gauges.

Oil pressure can be checked at the sending unit passage with an externally mounted mechanical oil pressure gauge. To get accurate results from the test, make sure you follow the manufacturer's recommendations and compare your findings to specifications.
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 disconnected from the sending unit with the key switch on, the needle on the oil pressure gauge should be either all the way high or all the way low. Grounding the wire should make the needle move to the opposite side of the gauge from where it was before the wire was grounded. If the vehicle is equipped with an oil pressure light, touching the wire to ground and then removing the wire from ground should turn the light on and off.
  • 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.
f43-19.jpg An oil pressure sending unit is removed with a special socket. Courtesy of Chrysler Corporation.
  • Tighten the oil pressure test gauge into the hole in the block where the sender was removed.
f11-15_3184.gif Measuring oil pressure. Reprinted with permission.
  • 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.
    • Watch as the engine warms to note any excessive drops due to temperature.
    • Make sure the engine speed is set to specifications for testing pressure.
    • 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.
    • If the oil pressure is within specifications, this shows that the oil pressure sending unit may not be working correctly.
    • 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.




Nov 17, 2009 | 2000 Ford Windstar

1 Answer

My oil light is on . I change the oil i change the oil pressure switch . I check the pressure with a gauge it goes to 50 when i start it the engine is very quiet but that light drive me crazy please help...


the oil pressure sending unit must be defective - it should be located close to oil filter - if another sending unit is purchased you can compare the two - most sensors only plug up one way - the light should be working thru ground - light may not come on if sending unit is unplugged as a test

Sep 26, 2009 | 1995 Honda Accord

1 Answer

Difference between oil sending unit and the oil pressure switch


Same part...make sure you get one for gauge, not idiot light though. If the engine has any knocking or ticking when pressure drops do not drive it and have a mechanical gauge installed to check actual pressure. Parts often have different names for same item...your driveshaft is actually called a propeller shaft!!!

Sep 18, 2009 | 2004 Jeep Grand Cherokee

2 Answers

The oil light wont go off and its making weird noises in the head


If you're hearing tapping noises, you probably have an oil pump issue. It's not putting out enough pressure to fully circulate and would account for the noise you're hearing as well as the oil light. Also check the oil pressure switch. A bad switch would turn on your light as well but shouldn't give you the noises you're hearing.

Jul 04, 2009 | 1995 Nissan Altima

2 Answers

My 2000 dodge neon had to have it's oil sending unit fixed.what is that and what does it do for the car?


Hi..my name is Keith..and the oil sending unit sends a signal to your oil pressure light or oil pressure gauge....i hope this has helped

Jun 29, 2009 | 1996 Dodge Neon

2 Answers

Oil Pressure light stays on. Oil reservoir is full,oil level light goes out and dipstick shows full oil. What could cause this?


It occurred to me that you may find it by unplugging wires on the few items under the hood which may appear they could be the oil pressure sending unit.

The light should go out when the wire is unplugged, and if it does it is bad. That's your continuity test.

If you unplug the oil pressure sending unit and the light does not go out, the cause of the oil light staying on is something other than the oil pressure sending unit.

RE pete cass posting: I believe that if the sensor is diconnnected, the oil pressure light will not light (at least because of the oil pressure sensor switch being disconnected) -- the symptom here is the light won't go off. The switch is closed with oil pressure below 10-15 PSI and open above that oil pressure -- this is a normally closed switch.

May 12, 2009 | 1995 Toyota Previa

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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