Question about 2003 Chevrolet Express

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Chevy express van runs rough and looses oil pressure. there is no oil leak, level is not dropping. need to know where the oil sending unit is located

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  • plumbsuper Mar 24, 2009

    it is not loosing oil. the oil is constant it is the pressure that is dropping.

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U will have to drop the oil pan or check on the back of the intake you since you are loosing oil pressure that would be more like the pump its self

Posted on Mar 24, 2009

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1997 chevy express van overheated now no oil pressure


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Jan 05, 2012 | 1997 Chevrolet Express

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I have a 2000 chevrolet venture and the low oil pressure light is on is this the oil pump or could this be the oil sending unit


I WOULD CHECK OIL PRESSURE FIRST, IF OIL PRESSURE OKAY,OIL PRESSURE SENDING UNIT FAULTY MORE LIKELY.IF OIL IS LOW YOU WILL HEAR RODS KNOCKING NOISE.

Jul 13, 2011 | 2001 Chevrolet Venture

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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


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


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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

My chevy 1500 express passenger vans oil pressure gauge in the dash is reading at the highest number 80, it normally reads at around 55, it just started doing it, it has the correct amount of oil in it,...


The oil sending unit located on the top back of the engine is clogged. this will cause high readings.
You should replace it. Until you do it is OK to drive your vehicle. The part is $20 to$30. If you can remove the engine housing in the van, the sending unit will be staring you in the face. It is about 3" long and about 1&1/4 " in diameter at the base. And of course there is wire/wires going to it.
Randy

Nov 10, 2010 | Chevrolet Express Cars & Trucks

1 Answer

Oil leak only when van is running and appears above the starter . Down 3 liters in 1 1/2 days.


It common for the oil to leak there when your oil pressure sending unit has gone bad. It's a simple fix, locate the oil pressure sending unit (between the starter and oil filter are) and replace. Auto Zone will have the part you need and step by step instructions to get the job done, Napa, and Part Source will have the part also. Do not use Teflon tape when installing the new oil pressure sending unit, the end is tapered and it needs a good ground to the engine block to work properly.

Good luck and this should take you around 20 min to replace once your start when the engine has cooled off to work on.

Mar 08, 2010 | 2003 Pontiac Montana

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Where is oil pressure switch in chevy lumina van 1996?


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Jan 23, 2010 | 1996 Chevrolet Lumina Mini

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

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Oil Pressure going up and down during acceleration and decel.


Check your oil level in the engine. Oil pressure will read this way when the oil level is getting low...

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