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Running at 5 psi when idling. Oil check light comes on when stopped.

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Remove oil pan and clean oil pick-up tube. Put an AC delco oil filter back on it as aftermarket filters will give problems. Check pressure with a mechanical gauge.

Posted on Jun 21, 2009

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Oil pressure on my 1991 Nissan sometimes drops to about 5 psi at idle when at operating temp. Other times it will drop to a more normal 25-30 psi. Is there is a high pressure relief valve sticking?


5 psi then 25 -30
what are these readings from ..an after market oil pressure gauge ?
oil light should come on if 5

what make of nissan
how many miles/kms on the clock

would first replace oil pressure sender
oil pressure relieve valve on the oil pump sticking is a possible
oil lower W rating used too thin at the moment
clogged oil filter or sump pick up
oil pump worn or
main bearings worn

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Jan 20, 2017 | Nissan Cars & Trucks

2 Answers

High temp low oil pressure light comes on after driving for a few minutes, then off when engine at driving rpm. At stop light (idle or low rpm) light comes back on. Normal driving it goes out.


You need to find out why you have low oil pressure. It is normal that as engine rpm's increase, the oil pressure will rise- the oil pump is moving oil faster. Even though your light goes out, you could still have critically low oil pressure. There should be sufficient pressure at idle to keep the light off. The light will come on when your oil pressure is almost nil- I believe for some it's as low as 8 psi. Normally, oil pressure at idle is specified anywhere from 15 to 40 psi. You would have to check specifications for your Expedition. To verify oil pressure, hook up a mechanical gauge at the oil pressure sending unit on the engine block. Check with a local shop.

The causes run from easy, simple to budget busting ruin. Low oil level, wrong grade oil, real old oil, oil leaks, internal oil leaks, worn oil pump, worn crankshaft bearings. It was pretty common on older very high mileage cars to have a fluttering oil light at stops and idle. It was time for a rebuild, or time to look for another car.

Jul 06, 2015 | 2003 Ford Expedition

1 Answer

Crankcase pressure


At IDLE the PCV does not open very much and therefore there may not be a vacuum under the valve cover.. maybe a couple psi. Try holding your hand over it and increase the idle? Does the air stop or reverse? (as you increase engine speed, the vac in the intake manifold increases and opens the PCV more so it will pull more gases out.) If so, I'm thinking you're OK. If your rings were really bad and you were getting lots of blow by you'd probably be seeing a Check Engine light (and other problems), and the air coming out would have smoke/oil vapor in it. No oil in the air cleaner? If 'no', then again, probably not excessive blowby. If I get a chance tomorrow, I'll check mine and get back to you how much is coming out of mine. Is it running OK otherwise?

Jul 23, 2014 | 1996 Nissan Pickup

3 Answers

Oil light on after engine warm-up on idle


this means a mechanical gauge test is required to check actual pressure warm idling if low below 20 psi then the oil pressure pump relief is stuck open or engine bearing are worn

May 15, 2014 | 2005 Opel Astra 1.4

1 Answer

Why do oil light come on after replaceing oil sending unit on 2005 dodge carvan


The engine produces oil pressure from the resistance(clearance ) between the bearings and crankshaft and the sending unit lets you know when there is no pressure. These switches ground the light in the dash around 5 psi. So as the engine gets warmer then the oil gets thinner with large amounts of clearance pressure drops. Test system with mechanical unit normal hot idle pressure should be 30-45 psi if low raise idle speed comes up then engine bearings are worn.

Apr 26, 2014 | 2005 Dodge Grand Caravan

1 Answer

Hi guys...my yaris is running rich, has poor gas mileage (360km on a full tank). and very slow and choppy idle (idles like a really old car) these are the things i have done so far : change air and fu


Do the following:
1. Clean the throttle body from inside.
2. Adjust the spark plugs gap to 1.00 mm.
3. Check fuel pump pressure. (44 Psi - 49 psi)
4. Remove the negative battery terminal for 5 minutes.
5. Connect the battery terminal.
6. Check the engine oil level and coolant level.
NOTE: Before starting the engine shut off all lights and loads for example room light, blower, radio, parking light etc.
7. Start the engine and hold the throttle at 3000 rpm till radiator fan comes on.
8. After the fan comes on release the throttle pedal and let it idle for 10 minutes.

May 08, 2012 | 2005 Toyota Yaris 1.3

1 Answer

Oil light flickers at idle in gear 1983 cadillac devill 4.1


This is because the oil pump is not pumping enough oil. It is either very low on oil, or the oil pump is going out. The light comes on when the oil pressure drops below 5 psi. This is very low. It should run about 25-30 psi at an idle.
Please rate 4 thumbs up, if this helps! Thanks for using Fixya.com

Jan 14, 2011 | Cadillac DeVille Cars & Trucks

1 Answer

Problem with it is the oil light comes on when at a stop sign or at a red light but then goes off when you get going. But it's not leaking any oil, has had oil changes regularly


It's most likely one of two things: Your engine could be low enough on oil pressure when idling that the light is coming on for that exact reason or your oil pressure sensing switch could be faulty and misreading the actual oil pressure and erroneously turning on the light. The only real way to tell is to have someone remove the oil pressure sensing switch and temporarily install a mechanical test gauge in its place to check the actual oil pressure available. If it's low then there is an internal engine problem of some sort. If the pressure is about 10 psi or higher at an idle and 30 psi plus at 2500 rpm then your sender is at fault.

Jun 21, 2010 | 1998 Chevrolet Cavalier

1 Answer

Oil light on at stop


engine oil pressure may be low remove oil pressure sending unit and install a pressure gauge check for pressure while warm if pressure is ok replace oil pressure sending unit oil pressure at idle should be between 5-15 psi at min

Nov 17, 2009 | 2006 Dodge Stratus

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