Question about Cars & Trucks
It could really be low oil pressure, or a faulty oil pressure switch/sender. I would remove the pressure switch and put a gauge on it. it you have good pressure at idle then i would suspect the pressure switch.
Posted on Nov 26, 2014
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Posted on Jan 02, 2017
SOURCE: 2002 Lancer OZ Rally...
I had the same problem with my 2003 Lancer OZ. The oil level and pressure were ok. Car was fine with no light when starting. After 10 to 15 mins of driving it would come on when I was stopped. It would go away when I pressed accelerator. Try replacing the Oil Sending Unit. It's about $10 and easy to swap. That was my problem.
Posted on Dec 18, 2008
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
The oil pressure sending unit has gone bad. I sending unit is just above the oil filter and you can get to it from the top. When you face the Engine look down towards the oil filter, the oil pressure sending unit is just above that and it looks like a cylinder with two wires coming from it. If you don't see it, it's right between the exhaust manifold and oil filter.
If you go to Auto Zone or Parts Source, they'll have the oil pressure sending unit and the step by step instructions, When installing the new sensor. Do not use teflon tape or any sealant, the sensor is tapered and need's the good ground from the engine to give you right readings.
Good luck and hope this helps.
Posted on May 11, 2009
It occurred to me that you may find it by unplugging wires on the few items under the hood which may appear they could be the oil pressure sending unit.
The light should go out when the wire is unplugged, and if it does it is bad. That's your continuity test.
If you unplug the oil pressure sending unit and the light does not go out, the cause of the oil light staying on is something other than the oil pressure sending unit.
RE pete cass posting: I believe that if the sensor is diconnnected, the oil pressure light will not light (at least because of the oil pressure sensor switch being disconnected) -- the symptom here is the light won't go off. The switch is closed with oil pressure below 10-15 PSI and open above that oil pressure -- this is a normally closed switch.
Posted on May 12, 2009
You may not have put the right amount of oil in your car, your oil pressure sensor could be faulty, or you may have a leak.
By revving your engine, you're increasing the pressure and thus turning off the light and making the sensor think that it's at the correct pressure.
Posted on Sep 08, 2009
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