Question about 2004 Mercury Grand Marquis

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Up and down oil pressure gauge - 2004 Mercury Grand Marquis

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Low oil level, dirty oil pump pickup screen. Bad sender. Senders are not that expensive to try, but attaching a real pressure gauge into the oil sender fitting would be the last external test you could do.

Posted on Jan 01, 2014

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Posted on Jan 02, 2017

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On 2003 Cadillac Escalade The Oil pressure gauge is below the 0 area but moves farther down and movesup and down below 0


you can not have less than zero oil pressure so the indications are that there is a fault with the oil pressure sender or oil pressure sensor
you should take the car to an accredited service center and have the oil pressure tested using a mechanical gauge to prove what oil pressure you have
from there you have the faulty item replaced

Aug 02, 2017 | 2003 Cadillac Escalade

1 Answer

How do I check no oil pressure on gauge? The oil pan is full.


First you need to find the sending unit. Some are by the oil filter. Most sending units sink current so by taking the lead off and grounding it you should get a reading on the gauge. This will narrow it down to whether it is the sending unit on the engine or the gauge on the dash. Depending on the car there are a bunch more questions to be asked but this is a general answer.

Dec 24, 2014 | 1999 Jeep Grand Cherokee

2 Answers

Why does my oil gauge vibrate when at a stop after driving freeway speeds, 2002 ford Ranger?


Factory gauges (especially Fords) are not known for being terribly accurate or reliable. As long as the gauge is pointed in the "normal" range, I wouldn't be too concerned.
If you want to pursue it, remove the oil pressure sending unit and perform an oil pressure test with a mechanical gauge. If the mechanical gauge fluctuates the same way, suspect a worn or failing oil pump. If the gauge is stable, I would suspect a faulty oil pressure sending unit.
If the truck has high miles, consider moving up to higher viscosity oil or adding an oil stabilizer. If could just be that the oil is breaking down when it's hot and the engine can hold consistent pressure with the thinning oil.

Jun 18, 2014 | 2002 Ford Ranger Regular Cab

1 Answer

If my oil sending unit is out will my truck break down


yes,it reads oil pressure only,if its out as long as it was working fine before it went bye bye your fine,you won't blow up engine or break down.

Nov 28, 2012 | Cars & Trucks

1 Answer

2004 Doge Ram 2500 5.7 Hemi 190K mile had oil pressure gauge drop to ZERO and check gauges light come on and engine shut down.. Check oil 1 guart low, add oil. let cool. crank up, good gauges drove home 45...


If the valve lifters are quiet you most likely have oil pressure even with gauge showing "0".Sounds like the oil pressure switch going bad.I would try that first.

Apr 28, 2017 | 2004 Dodge Ram 2500

1 Answer

Oil pressure gauge reads 40 or half pressure


on general motors engines all the way down to 15lbs of oil pressure is acceptable i prefer 30 but if the 40 you have down is the lbs of pressure your in good shape brand new engines generally only have about 45lbs of pressure

Mar 16, 2010 | 1994 GMC Suburban

1 Answer

Oil gauge fluctuates back and forth. sometimes


You'll need to determine if the oil pressure is actually changing, or if the sending unit or gauge is lying to you. Be certain the oil level is up to normal, then check the actual oil pressure with a test gauge. If the pressure varies (drops) at engine idle, perhaps your pressure bypass is defective, or perhaps the oil pump is worn. Testing with a known good pressure gauge should lead you in the right direction.

Oct 24, 2009 | 2000 Jeep Grand Cherokee

1 Answer

The oil pressure gauge keeps dropping down to 0 while i am driving


If you don't hear any ticking or knocking while the pressure gauge drops, the problem is probably a failing "oil pressure sensor". If you do hear a ticking or knocking, the problem is probably a failing "oil pump".

Jun 03, 2009 | 1997 Jeep Grand Cherokee

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

Oil gauge goes up and down.


If grounding the dash does not work, try putting a mechanical gauge on it and reading actual oil pressure. Pressure does change while driving, but should not wander. With mechanical gauge, check that running hot at idle (in gear if automatic) pressure should not drop lower than 15psi (I'd rather see 20) High reading should be around 40 -50 but no higher.Low pressure indicates a loss of supply or bad bearing on the crankshaft, high pressure may be caused by sticking pressure relief or restriction in an oil passage.

Apr 19, 2009 | 1997 Jeep Wrangler

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