Question about 2007 Chevrolet Tahoe

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Oil pressure gauge shows no pressure so the computer tell me to turn off the engine but the oil level is full. somebody told me that it is the sender.

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Could be...but my money is on the gauge. GM issued a technical service bulliten about this.

Posted on Apr 28, 2010

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Have a gauge hooked up to low pressure fuel pump and it shows it works but high presssure one doesnt


Check to see you have oil up to full on dipstick . The high pressure pump picks up oil at the top level so if oil starts to get to low engine will stop before engine damage . The high pressure pump is what makes the injectors fire . Also check the wires that go thru valve cover some times they burn up and you can smell the burn thru the oil filler cap .

Apr 05, 2014 | 1996 Ford F350 Crew Cab

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Oil pressure gauge is reading zero


Could be the gauge on the dash. If you really had no oil pressure the engine would be very loud.
A mechanic would check oil pressure with a mechanical gauge to verify.

Jun 17, 2013 | 2006 Chevrolet Tahoe

1 Answer

How do i tell if i have a bad oil pump or a bad oil sensor


If oil level in engine is at proper level, I wouild suspect oil pressure sending unit, does vehicle have an oil psi gauge on dash,,,if so what does it read. if oil psi reads well then it may be an oil level sensor. if you have access to a manual oil pressure gauge, you can remove the oil psi sensor and install manual gauge to get a true reading of what oil pressure is while running. if manual gauges shows low psi, then you may be looking at an oil pump.

DW Mylin

Nov 27, 2012 | 2006 GMC Envoy

2 Answers

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

1 Answer

Put a new oil sending unit on and still gauge dont work


Your engine may have two oil pressure switches, one for the guage, and one to turn the idiot light off. The worst case scenario is that the oil pump is shot, or the oil pickup screen is clogged with ****.

May 03, 2012 | 1998 Ford Expedition

1 Answer

2005 grand Prix oil pressure light an dinging comes on


1. Check your oil level. If oil level is not ok, correct oil level and find out why oil level was low and correct the problem. (Leaks, bad PCV, Burning oil due to severe engine wear, nobody has bothered to check it for the last 3000 miles, WAY overdue for an oil change, etc.) If oil level is ok, proceed to next step.

2. Remove the oil pressure sensor and install a manual oil pressure gauge. Run engine to verify low oil pressure. If gauge shows that the oil pressure is low, overhaul or replace engine. If oil pressure is ok, replace oil pressure sending unit and retest.

Mar 06, 2012 | 2005 Pontiac Grand Prix

2 Answers

Low oil pressure no start


CHECK ENGINE OIL LEVEL ON OIL DIP STICK.OIL LEVEL SHOULD BE ON FULL MARK IF NOT ADD OIL UNTIL YOU GET TO FULL MARK.IF OIL LEVEL OKAY.YOUR LOW OIL PROBLEM CAUSED BY WORN DAMAGED OIL PUMP OR WORN ENGINE CRANKSHAFT BEARINGS.IF OIL HAS NOT BEEN CHANGED A LONG TIME CHANGE OIL AND OIL FILTER NOT GUARANTEE TO FIX PROBLEM.BUT COULD BE MINOR THING.OIL FILTER COULD BE STOPPED UP.WEAKEN OIL FLOW BUT LIKE I SAID PROBLEM COULD BE OIL PUMP OR ENGINE BEARINGS.REMOVE OIL SENDING UNIT SCREW IN A OIL PRESSURE GAUGE.TURN ENGINE OVER SEVERAL REVOLUTIONS TO SEE IF OIL PRESSURE BUILD UP TO 40 LBS. SEE 40 - 60 PSI. 2000 RPM.IF NO OIL PUMP TO WEAK .IF OIL PRESSURE RISES WHEN TURN ENGINE OVER.I HAVE SEEN FAULTY OIL PRESSURE SENDING KEEP ENGINE FROM RUNNING BECAUSE OIL PRESSURE SENDING UNIT WILL DISABLE FUEL PUMP RELAY TO KEEP FROM DAMAGING THE ENGINE.

Sep 23, 2010 | 2003 Lincoln Navigator

1 Answer

How much New oil should i put in to my 1992 Suzuki Sierra 4x4 Cheers Neil B


First make sure your drain plug and filter are installed and tight, then add 2 liters of oil and check to see if there is any showing on the dipstick. Add one liter at a time and recheck the dipstick. Bring the level up to the full mark on the dipstick. Now start the engine and observe the oil light(turn off) or pressure gauge(pressure goes up) then turn off engine. If neither happens after about 10 seconds, shut off engine and check for leaks or other malfunctions. If all is O.K. then recheck oil level on dipstick. It should be somewhere between the upper and lower level, usually indicated by crosshatch marking. Add oil to bring oil level to full mark. Small amount at a time. Most small vehicles only take about 3.5 to 4 liters.

Oct 31, 2009 | 1993 Suzuki Samurai

2 Answers

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...

May 27, 2009 | 1987 Porsche 944

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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