Question about 2005 Chevrolet Silverado 1500HD

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No oil pressure, is it the oil sending unit or oil pump?

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  • Chevrolet Master
  • 2,002 Answers

Do you hear lifters ticking? Or knocking inside the engine? Do these sounds change with engine RPM? If you don't hear them it is likely a sending unit, if you do then it could be the oil pump. Either way, you need to hook a mechanical oil pressure guage to the engine to confirm which is the problem. If the guage shows normal pressure then the problem is the sending unit. If it doesn't then you need to look further and this would best be left to a professional.
I would be very reluctant to drive this until you confirm which one is the problem because if it is indeed the oil pump even a short drive can ruin the engine. Hope this helps.

Posted on Mar 12, 2011

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Posted on Jan 02, 2017

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SOURCE: Pontiac Bonneville(2000) oil pressure sending unit

The oil pressure sending unit is located behind the oil filter, Threaded into an aluminunm housing. It has wiring that plugs into the sending unit. The oil filter has to be removed and you will need a deep well socket and a 6 inch extension. Change the oil and the sending unit together.

Posted on Feb 02, 2009

farroutideas
  • 78 Answers

SOURCE: oil pressure sending unit

Hi there;

Your looking foer the oil pressure sensor on the 2004 8.1L.
You will find it located directly behind the EGR valve threaded into the block just to the drivers side of the center bolt for the transmission to block connection.

Thanks
Farrout!

Posted on Mar 17, 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

peterrance19
  • 399 Answers

SOURCE: where is the oil sending unit on a 2001 ford

hi the only problem driving it is not knowing ? its located on the front surface of the drivers side cylinder head near/next to oil filter hope this helps if so please rate it

Posted on Nov 20, 2009

techbuster
  • 5081 Answers

SOURCE: Exactly where is oil pressure sending unit located

if you have the 5.2 V8 its located in the rear of the engine near the dist cap area you can see it if you look in that area , if 4.0 6 cyl its located on the side of the engine block near the oil filter area. It has two wires going to it and screws into the block. It's made mainly of plastic and if broken can allow oil under pressure to spew out and give you thoughts of a blown rear main seal due to the amount of oil all over the underside.

Posted on Dec 09, 2009

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1 Answer

What causes oil pressure to drop when sitting at red light


Three things, low on oil, low on pressure, bad sending unit. First one is easy, do you have enough oil in engine. Second, is the oil pump functioning properly. Third, is the pressure sending unit working properly. I recommend changing oil first if still occurs, replace sending unit, then if it still happens, i would have the pressure tested with a mechanical gauge. If pressure ok then drop oil pan and check screen. Screen clear replace pump unless there is alot of metal in pan then rebuild motor

Dec 24, 2015 | Cars & Trucks

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How can i fix the oil pump


see this tips and fix it. God bless you
The oil pump supplies oil to lubricate your engine. If the oil pump is worn or is not turning, the engine will suffer a loss of oil pressure, which may result in engine damage or engine failure.
The first sign of trouble may be a low oil pressure warning light, a drop in the normal reading on you oil pressure gauge (if your car has one), or the appearance of ticking or clattering sounds from your engine.
As a rule, most engines only need about 10 PSI of oil pressure for every 1,000 RPM of engine speed. Oil pressure will read higher than normal when a cold engine is first started because the oil is thick. Oil pressure will gradually drop as the engine warms up and the oil thins out. So normal oil pressure on a warm engine cruising down the highway is typically 30 PSI up to 45 PSI.
SYMPTOMS OF OIL PUMP TROUBLE
The first thing you should do if any of these symptoms occur is to stop your car, turn off the engine, let it sit for a few minutes, then check the oil level on the dipstick. If the oil level is at or below the ADD line, add a quart of oil to bring the level back up to the full mark. Add as much oil as is needed to raise the level to the full mark. Then restart the engine. If the warning light remains on, or the oil pressure reading does not climb back up to its normal range, or the engine noise does not go away, you may have a bad oil pump.
The other possibilities include a bad oil pressure sending unit, or a problem with the oil pressure warning light circuit or oil pressure gauge.
OIL PRESSURE SENDING UNIT
If the engine is NOT making any unusual noises and seems to be running normally, and the oil level on the dipstick is FULL, but you are still getting a low oil pressure warning light or low gauge reading, the fault could be a bad oil pressure sending unit.
The oil pressure sending unit is mounted on the engine block. On some applications, there is a spring-loaded pressure-sensitive diaphragm with a switch inside the sending unit. This switch completes the circuit to the low oil pressure warning light if oil pressure drops below a certain threshold. The unit may stop working if the diaphragm inside fails, if the switch is stuck, if the small hole that allows oil to enter the sending unit becomes plugged, if there is a loose, corroded or broken wiring connector at the sending unit, or there is a fault in the wiring circuit between the sending unit and warming light.
On vehicles that have an oil pressure gauge (electronic, not mechanical), the oil pressure sending unit has a small rheostat inside that sends a variable voltage signal to the oil pressure gauge when the diaphragm moves. A worn spot on the rheostat or any of the other problems just described for the simple pressure-type oil pressure switches can cause a problem.
FORD'S FAKE OIL PRESSURE GAUGE
On many Ford vehicles that were built from 1980 through the 1990s, the oil pressure sending unit has two switches, a low pressure and a high pressure. These vehicles also have an oil pressure gauge, but the reading on the gauge is not a true indication of real oil pressure. As long as the pressure to the sending unit is between high and low, the gauge will read normal. If oil pressure drops and trips the low pressure switch, the dash gauge will now read low. Or, if oil pressure goes up and trips the high switch inside the sending unit, the dash gauge will read high. Consequently, don't rely on the oil pressure gauge for an accurate reading in these vehicles. It is only a gross indication if the oil pressure is low, normal or high.
OIL GAUGE PROBLEMS
If the engine is NOT making any unusual noises and seems to be running normally, the oil level on the dipstick is FULL, and you have replaced the oil pressure sending unit but are still getting a low oil pressure reading on the dash gauge, the fault could be in the wiring circuit between the sending unit and gauge, or the gauge itself might be bad.
Check the wiring connections on both ends as well as wiring continuity between the sending unit and gauge. If no wiring faults are found, hook up a pressure gauge directly to the oil pressure port on the engine and check oil pressure with the engine running. If the engine-mounted gauge shows normal oil pressure but the dash gauge is reading low, the problem is a bad dash gauge.
On the other hand, if the engine-mounted pressure gauge reads low and you have done all of the above, chances are the oil pump is worn, or it is not picking up enough oil because of a restriction or blockage in the pickup screen in the bottom of the crankcase.
OIL PUMP PICKUP PROBLEMS
The pickup tube has a screen on the end to prevent large chunks of anything bad that ends up in the crankcase from being sucked into the pump. But we are talking BIG chunks of debris, not normal wear particles or carbon or dust or other microscopic-sized abrasive particles that can cause pump wear over time.

Sep 28, 2012 | 1996 Toyota Tercel

3 Answers

My low oil light comes on while trying to crank my car and car stalls; will not start until I keep trying a couple of times. After it starts it runs fine and then shuts off after backfiring sometimes and...


LOW OIL PRESSURE WILL CAUSE OIL PRESSURE SWITCH OR SENDING UNIT TO DISABLE FUEL PUMP.CHECK FOR OIL PRESSURE.REMOVE OIL PRESSURE SENDING UNIT SCREW IN OIL PRESSURE GAUGE TESTER INTO BLOCK WHERE OIL PRESSURE SENDING UNIT GOES TURN ENGINE OVER CHECK FOR OIL PRESSURE SHOULD BE 18 PSI @ 2000 RPM. BESURE TO WRAP TEFLON PLUMBERS TAPE AROUND THREADS TO THE OIL GAUGE PRESSURE TESTER OIL WILL SPRAY EVERY WHERE.IF YOU ARE GETTING NO OIL PRESSURE.YOUR OIL PUMP FAULTY.YOUR ENGINE CRANKSHAFT BEARINGS WORN OUT.WORN DAMAGED CAMSHAFT OIL PUMP DRIVE GEAR OR OIL PUMP DRIVE ROD DAMAGED OR BROKEN. IF OIL PRESSURE OKAY OIL PRESSURE SENDING UNIT IS BAD.

Sep 28, 2011 | 1994 Chevrolet Caprice Classic

1 Answer

Hard start ,after start runs great. after warm up 30 miles cuts out sluggish light pressure on gas will maintain speed does not cut out on iddle 55psi fuel pressure not coil, no codes


It sounds like the oil pressure sending unit . The way a lot of chevy engines work is the oil pressure sending unit is a back up power supply for the fuel pump . So evern if the fuel pump relay is bad the pump will still get power through the oil pressure sending unit its a split curicut .However it will make a longer cranking time until the oil pressure can reach enough pressure to trip the sending unit to send the voltage to the fuel pump . If you have a 4.3 the sending unit is is in the extereme rear of the engine to the left of the disturbitur shaft and you need a speical deep socket to remove and install it . The part is about 20 dollars make sure you buy a good one and the tool is about the same

Jul 15, 2011 | Chevrolet C1500 Cars & Trucks

1 Answer

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.

Jun 13, 2011 | Cadillac Catera Cars & Trucks

1 Answer

No oil pressure


either replace oil sending unit or get a manual oil pressure gauge and screw in to oil sending unit port and visually check with engine running to see if or what the actual pressure is. If 0 pressure registers then bad oil pump. but if good pressure, then you have a bad oil sending unit. also change oil filter.

Mar 05, 2011 | 1998 Mercury Mountaineer

1 Answer

98 chevy 1500 starts and then shuts right off have replaced fuel pump and filter ,crank sensor,cam sensor ,oil sen. coil,ign.mod and PCM


On some chevys the oil pressure sending unit closes the circuit to continue the fuel pump to run after start. In the event of a wreck ,the car stops running thus no oil pressure thus turns off power to the fuel pump .A safety to help prevent fires. When you first start the car, the computer turns on the fuel pump for about 20 seconds just enough time to start and allow the oil pressure sending unit to close the circuit to allow it to continue running. when the car car has NO oil pressure or the sending unit fails ,it will start then shut down..as many times as you try to start. replace the oil pressure sending unit and secure a good conection. Dan

Feb 13, 2011 | 1998 Chevrolet C1500

3 Answers

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)

Jan 13, 2011 | 2003 GMC Sierra

1 Answer

Oil pressure light flashes intermittily. oil level is okay.


HI. I would advise to have the oil pressure sending unit(sensor), and oil pump inspected immediately for faults. If the oil pressure sending unit is operational , and the wiring is ok, replace the oil pump and screen.


To verify proper oil pressure, i recommend purchasing a manual oil pressure test kit form your local auto parts store. This will make it easier to isolate the actual issue.

NOTE- The most common error will be a faulty sending unit, or sensor(oil pressure)


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2 Answers

No oil pressure


It could be the sending unit,but it could also be the high pressure bypass on the oil pump itself,the sending unit will be on the side of the motor usually close to the oil filter.

May 23, 2009 | 1997 Ford Expedition

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