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Oil light on only when car is at low RPM - 2005 Chrysler 300

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Oil pressure switch

Posted on Jul 29, 2009

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Posted on Jan 02, 2017

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SOURCE: low oil pressue light at low rpm

wrong oil need 10w 40 weight caster oil is best. See right now you have thin oil and in hot weather and hot motor temp . It just gets thiner . now with 10w 40 you will bring it up a bit thus lowering the oil presser and bringing it to a happy medium .

Posted on Jul 12, 2008

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SOURCE: oil pressure light at low RPM

Before you have major repair done on your car because of the "oil pressure light", review the list and see if any of these might be the source.  Some of the things on this list are things you can do yourself, some only done by a mechanic (inexpensively), and others require the aid of a mechanic.
1.  Check to see if you have a leak.  Low oil levels can make the oil sensor light come one.  Check your oil level following the manufacturers recommended procedure or use the information listed here http://autorepair.about.com/od/regularmaintenance/a/checkoil.htm.  If you do not have a low oil level, but still suspect a leak, place a drip pan under the oil plug overnight.  If you have a leak, you'll see signs of it there.  Then take the vehicle to a trustworthy mechanic and let them trace the leak.  It is possible for your engine to only leak when it is hot, so make sure you get the engine nice and warm before you put the car away for the evening and place the drip pan under your vehicle.  Other signs of an oil leak are listed below as well as an "oily" exhaust that leaves it mark on your bumper or "blue smoke" as you drive/idle.
2.  Check the coolant levels. If the coolant is low, the oil will heat up faster and cause a viscosity breakdown.  When the oil viscosity is low (= thin oil), the oil sensor light can come on.  If the coolant is low, add more.  Keep in mind that an engine running hot will heat the engine oil to the point that it thins out and burns off in the cylinders.  If the coolant level is fine, have the coolant (water) pump checked.  If the coolant is not circulating well through the engine, you'll probably have coolant boiling over, too.
3.  If you can afford to do it, change your oil to a higher or lower viscosity.  Refer to your maintenance manual and your trusted mechanic. I say this because, if your oil is thinning out too much because the viscosity is too low, your "check oil" light will come on.  If your engine oil is too thick, you engine will need added internal pressure to get it to circulate.  At lower RPM (just like thin oil), your engine oil light will come one.
4.  Have the oil pressure checked by other than an electronic means.  Your trusted mechanic can place an oil gage between your oil filter and the rest of the engine or on the oil fill cap of the engine.  If you are having an oil pressure problem that is seal-related, that should narrow it down.  If you can't afford to do that, when you get your next oil change, replace: the oil fill cap, PCV valve, and air filter.  All these contribute to the measurement of engine oil pressure by that picky little oil pressure sensor.
5.  Have the oil pressure sensor checked.  You may need some weird add-on to make it behave.  Do a search for the following part and read and you should have a better understanding: "part # 05017800AA a terminal/wire/vent to the oil pressure switch connector".  Never forget that sensor are usually engineered to report a problem well before a catastrophic failure can occur.
6.  If you're driving a high-milege car, make sure you are up to date on all of the engine-specific services.  For some vehicles, it is recommended that the head gaskets are replaced.  If you have internal engine leaks because of it, this will solve most of those issues.  Signs of this include: coolant visible in the crankshaft area (you can see this with the oil cap off), oil fouling your coolant (you can see this in the coolant reservoir), or smokey exhaust.  Expect your trusted mechanic to recommend that you change your spark plugs, timing belt, and cam shaft gasket at the same time.
7.  See if the oil pump needs to be replaced.  A faulty oil pump can contribute to low oil pressure as it fails (but hasn't failed, yet).  
8.  Do all of the above BEFORE you take to recommendation to have your engine replaced.
I have a 1998 Chrysler Cirrus (I know it's not a minivan, but hear me out).  I've been the single owner and have learned more about how engineering oversights or over-cautiousness can send you to the mechanic for just about everything.
Hope this helps!

Posted on Jan 20, 2009

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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

My rpm drops to 500 when in idle mode after its warmed up and then oil light comes on


500 rpm when not in gear seems a bit low but not ridiculous. Oil light comes on when oil pressure is too low. Is your oil very old, do you fail to change it ever. Or your idle speed just isn't high enough to maintain pressure. You may need a new oil pump.

Feb 05, 2015 | Cars & Trucks

1 Answer

Oil light coming on when clutch engaged


idle is too low?
look at the tachometer. What RPM is it? 800 ok, 300 bad.
the silly switch comes on at 3 to 5psi, (bad bad horror that)
if the light comes on, the oil pressure is horribly low.
running 5w oil?
low rpm, or wrong oil., or bad news.

if rpm too low, fix that first.
all cars.

Jan 17, 2014 | 2006 Suzuki Jimny 1.3

1 Answer

Oil warning light goes on when low rpm


low viscosity oil; add an oil additive (honey, as we call it) if the oil is relatively new or change the oil to something thicker. sometimes this happens because of the oil pressure sensor, and we replace it if it shows signs of leakage, but generally this is because of engine wear.

Mar 08, 2013 | 2002 Mazda Tribute

1 Answer

1999 chrysler sebring low oil pressure at idle


It may be the oil pump. If the gauge is going up when the rpms increase it's probably not the gauge or pressure switch. If the computer senses the oil pressure is low it will shut the vehicle off to try to save it's self from catastrophic failure. Also it may start cranking longer before starting. Thats it building oil pressure before the computer will let it start. Make sure oil is full, clean & thick.

Nov 05, 2012 | 1999 Chrysler Sebring

1 Answer

Why does the oil light turn on when rpm drops below 1000


Oil light pops on at low rpm because at a low rpm, your engine is not running fast enough to maintain full pressure. this is because either you have an oil leak, or defective oil pressure switch.

Apr 01, 2012 | 2006 Chrysler PT Cruiser

1 Answer

Oil light with a line underneathe it, what does the light indicate?


Low oil, bad sensor, really low idle.
First check oil level.
then if oil level is ok, and oil light is still there, pay attention to idle has to be 750 to 850 RPM.

If idle ok, give gas to increase idle to more than 2000 rpm if light goes away you need a sensor called OIL PRESSURE SWITCH.

Dec 31, 2010 | 1994 Toyota Land Cruiser

1 Answer

My 1999 pontiac grand am will idle low, but does not cut off.


Sounds like your oil pressure sensor may be faulty. Or your oil level is very low. Your engine should idle as low as 650 rpm without your light coming on.

Apr 10, 2009 | 1999 Pontiac Grand Am GT

1 Answer

2002 chrysler concorde lx low idle


with a 2002 Concord 3.5 V-6, what should the rpm be at 60mph? 70 mph?

I'm not sure if the overdrive gear is lost in the tranny, but the transmission light is on.

Thanks

Apr 05, 2009 | 2002 Chrysler Concorde

1 Answer

Low oil pressue light at low rpm


wrong oil need 10w 40 weight caster oil is best. See right now you have thin oil and in hot weather and hot motor temp . It just gets thiner . now with 10w 40 you will bring it up a bit thus lowering the oil presser and bringing it to a happy medium .

Jul 12, 2008 | 1999 Audi A4

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