Question about 2005 GMC Sierra

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Oil pressure is pegged out, even when engine is off it stay above 80. There are no leaks or oil burning. could this just be the sending unit or the gauge.

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Yes it could be and most likly is.

Posted on Mar 16, 2011

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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

2003 yukon denali oil pressure switch pegged over the 80 psi indicator. Oil qty is good.


Sounds like a bad oil pressure sending unit.

Try unplugging it and see if the gauge drops to zero. If it does than replacing the oil pressure sending unit will most likely fix your problem.

It is not easy to see or get at but you can find it on the back side of the engine on the drivers side, kind of in between the valve cover and the intake plenum

Apr 08, 2013 | 2003 GMC Yukon Denali

1 Answer

1978 CHEVY C10 6CYL OIL PRESSURE SENDING UNIT WIRING


Take the sending unit back, either you truly have high oil pressure and you blow the oil filter or the sending unit is shorting together with power,or the harness has rub through together, either way get another part under warranty and go from there,and be careful how you install the unit

Nov 09, 2012 | Cars & Trucks

1 Answer

1997 Jeep Cherokee Sport hard to start after its warm and fluctuating oil pressure


Hi there:
It sounds like it could be oil pressure sending unit. I would check the connection on the sending unit. Below are the procedures for checking the sending unit, If it checks out good I would have a mechanical gauge set up to measure the pressure.

TESTINGTo test the normally closed oil lamp circuit, disengage the locking connector and measure the resistance between the switch terminal (terminal for the wire to the warning lamp) and the metal housing. The ohmmeter should read 0 ohms.To test the sending unit, measure the resistance between the sending unit terminal and the metal housing. The ohmmeter should read an open circuit (infinite resistance).Start the engine.Once again, test each terminal against the metal housing:The oil switch terminal-to-housing circuit should read an open circuit if there is oil pressure present.The sending unit-to-housing circuit should read between 15-80 ohms, depending on the engine speed, oil temperature and oil viscosity.To test the oil pressure sender only, rev the engine and watch the ohms reading, which should fluctuate slightly (within the range of 15-80 ohms) as rpm increases.If the above results were not obtained, replace the sending unit/switch with a new one.

Hope helps.

Mar 23, 2012 | 1997 Jeep Grand Cherokee

1 Answer

Oil pressure gauge goes up to 80 pounds


80 lbs is good. It's more like around 50, it's probably the oil sending unit. Take a look at it aand make sure it in't leaking. If there is any oil covering it and none coming from above it is leaking. I don't know engine size, but they are usually located around the oil filter.

Apr 29, 2011 | 2000 Jeep Grand Cherokee

4 Answers

I have a 2003 gmc sierra 5.3 liter vortec why does my truck leak oil only under pressure


because your oil pressure rises to around 40psi when running and will leak at the weakest place,check your oil sending unit first and seals.






Tim

Oct 20, 2010 | GMC Sierra 1500 Cars & Trucks

1 Answer

Oil pressure


is there any leaks possible dissconnected oil sending oil durring oil change this some times happen or double check oil level on dip stick.

Mar 22, 2009 | 2000 Jeep Grand Cherokee

2 Answers

Oil pressure gauge reads 80(pegged),,oil tepm is 207....car runs great


it is probably the oil sending unit if you have access to a direct reading oil pressure gauge put it on and if oil pressure is reading normal replace sender

Nov 05, 2008 | 2000 Chevrolet Corvette

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