Question about 1999 Chevrolet Silverado 1500

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Oil sending pressure switch - 1999 Chevrolet Silverado 1500

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  • Anonymous Sep 06, 2008

    change oil pressure switch on a Chevrolet C3500 1 ton truck

  • jjluna63 Jan 17, 2009

    I have a three prong switch. What are all the wire for? Is this the cause to my oil leak out the weep whole?

  • rechanic May 11, 2010

    need more info

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  • Master
  • 957 Answers

What do you need? If it helps, yes it has one, yes if it becomes faulty the fuel pump wont work.

Posted on Jun 07, 2009

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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

Where do I locate the oil pressure switch on a jaguar xj6 4.0 engine ? The oil pressure is way low ! 99 % of the times it is the oil press. switch sending the wrong signal to the gauge Right ?


The switch / sending unit should be on the side of the block.
While it is true the switch / sending unit can fail, you should also know the engine bearings and oil pump can wear down and cause a drop in oil pressure.

Sep 05, 2014 | Cars & Trucks

1 Answer

Chevy 350 oil pressure sending unit


The Oil Pressure Switch is located:Under hood, center, rear engine area, driver side of distributor, mounted in block. Here's what it looks like.he oil pressure switch is mounted to the top rear of the engine.

  1. Remove the electrical connector from the switch.
  2. Remove the oil pressure switch.
  3. To install, reverse the removal procedures.

Jul 18, 2013 | Cars & Trucks

1 Answer

I need to replace the oil sender switch on my 2002 Buick La Sabre


first need to buy oil pressure sending unit 3/8 deep socket remove oil pressure sending unit you need teflon tap sealer for oil sending unit threads.okay to replace oil pressure sending unit.you need safe raise support vechicle locate oil pressure sending unit next to the oil filter.disconnect oil pressure sending unit wire connector then use oil pressure sending unit 3/8 socket remove the sending unit.then take new oil pressure sending unit use teflon tape white plumbers tape or use thread sealer apply to the oil pressure sending unit threads then install new oil pressure sending unit and reconnect electrical connector to sending unit.then crank engine check for oil leak if all is good lower vechicle back to ground wait several minutes check engine oil level.you good to roll.

Feb 09, 2013 | 2002 Buick LeSabre

1 Answer

Where is the oil sending unit on a 1995 Buick Skylark 3.1 V6?


OIL PRESSURE SWITCH

1995 Buick Skylark 2.3L MFI DOHC Quad 4 4cyl

The Oil Pressure Switch is located:

OIL PRESSURE SWITCH

1995 Buick Skylark 3.1L SFI OHV 6cyl

The Oil Pressure Switch is located: Under hood, center, front engine area, front driver side of engine, mounted in engine block

Jan 05, 2013 | 1995 Buick Skylark

1 Answer

I need to know where the oli sending unit is and how to replace it?


zjlimited_305.jpg

Fig. 1: Location of the oil pressure switch-3.3L and 3.8L engines


zjlimited_306.jpg

Fig. 2: Location of the oil pressure switch-3.0L engine


zjlimited_307.jpg

Fig.: Oil pressure switch (sending unit) schematic


The low oil pressure warning lamp will illuminate when the ignition switch is turned to the ON position without the engine running. The lamp also illuminates if the engine oil pressure drops below a safe oil pressure level. To test the system, 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 still fails to light, check for a burned out lamp or disconnected socket in the instrument cluster.

REMOVAL & INSTALLATION
On the 2.4L engine, the oil pressure switch is located on the side of the engine block facing the firewall. On the 3.0L engine, the oil pressure switch is located on the oil filter adapter housing, next to the starter motor. On the 3.3L and 3.8L engines, the oil pressure switch is located next to the oil filter.
  1. Locate the oil pressure sending unit on the engine.
  2. Disconnect the negative battery cable.
  3. Disconnect the pressure switch electrical harness.
  4. Using a pressure switch socket, deep-well socket or wrench, loosen and remove the pressure switch from the engine.
To install:
  1. Install the pressure switch into the engine and tighten securely.
  2. Attach the electrical connector to the switch.
  3. Connect the negative battery cable.
  4. Start the engine, allow it to reach operating temperature and check for leaks.
  5. Check for proper oil pressure switch operation.

Hope this helps (remember to rate this answerr).



Dec 22, 2010 | 1999 Plymouth Voyager

1 Answer

1990 toyota4runner oil pressure sending unit how does it look and is it the same as the oil pressure switch I have low oil pressure and a sticky valve


yes, the oil pressure switch and oil sending unit are the same just two ways of saying it, i will enclose a picture of the oil pressure switch, this switch is located on the driverside of the engine in the lower front part of the block. hope this is helpful.7f668e6.jpg

Oct 30, 2010 | 1990 Toyota 4Runner

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

Where is the oil pressure sensor located


Oil pressure switch or oil pressure sending unit.most cars have both.If it has one wire it is an oil pressure sending unit. if it has a plug with 2 or more wires it is an oil pressure switch and sends a signal to the inboard computer. Remove the wire either a nut or usually a plug.some sending units take a special socket but if you can get a wrench on it turn it counter clock wise and unscrew it. When you get the new one it will have a red material on the threads, this is a sealant.thread the new switch snug and put you plug back on.The sending unit or oil pressure switch is located next to the oil filter. Good luck and keep me posted, Auto Zone will have this part and also have the step by step instructions for you to get the job done.

Nov 17, 2009 | 1996 Nissan Sentra

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

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