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this is normal, when the car is cold or off. the oil sinks down in to the oil pan.,.

If this is a GM engine you may be using an aftermarket oil filter that allows oil to drain back this is not a good thing and can cause engine damage. GM has a TSB on this very problem.

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โˆ™ 2010-09-24 22:25:52
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Q: Why would the engine have no oil pressure when it is cold?
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2001 Ranger XLT the oil pressure gauge sticks at zero when it is cold. When the engine warms up the gauge works fine How do you fix this?

I would start by replacing the oil pressure sending unit. If that does not correct the problem, I would look closely at the gage itself. If you hear any valve train noise at cold startup, you need to have an oil pressure test run to make sure you actually have good oil pressure when starting the engine cold. Possibly the gage is correct and you do have 0 oil pressure when cold.


Why does oil pressure gauge fluctuate?

From the moment you turn on the vehicle, it changes in two ways: 1. When it is cold and the oil is cold and thicker, it needs more pressure to pump the oil through the engine. You will notice a change in the oil pressure at idle when it is cold and at idle after the engine has had a chance to warm up. 2. The higher RPM the engine has to operate in (such as going through speeds 1, 2, 3, OD, or flooring it to pass someone), the more lubrication the engine will need and thus the higher the oil pressure. As soon as the engine slows down, so the oil pressure lowers.


Oil pressure gauge is wiggle when engine running hot. Could be oil pressure switch defective or the oil pump?

the engine gets hot and while your engine is running your oil is going through your engine lubbing it. by the time the engine gets hot the oil is spread throughout the engine. if you have too much oil in the gauge will act weird because its hooked up to your oil to read its pressure. if it was youroil pump or switch it would do this when the engine was cold to. make sure the oil is at the correct level b4 spending money on a switch or pummp


What makes oil pressure gauge read high?

Cold oil when you first start the engine will have lots of pressure then it will settle down as the oil warms and thins out.


Where is the oil pressure switch on the Saab 95?

The oil pressure sender or pressure sensor is located on the side of the engine next to the fire wall.if you are facing that side it would be to the upper left of the starter.i believe you want to use a 23 mm semi deep socket and do it when engine is cold!


What would cause a Chevy 350 engine to have oil pressure when cold and lose oil pressure when at running temp?

When the engine is cold, all the parts are tight. Meaning, the bearings, rods, and all have less gap. The oil is also thick. As the engine warms, the oil also warms making it lighter or more fluid. If the main bearings have too much gap, then with the warmer oil the oil flow will increase which in turn will lower the oil pressure. It would not be abnormal to start out with 50 or 60 lbs then have it reduced to 20 lbs at idle. Although the pressure would increase to around the 50 lbs. mark as the engine rev's up. If the oil pressure goes down to say 10 lbs, even at high rev's, then have the pressure checked with a mechanical gauge to confirm the reading and if so, well, time for a rebuild. Low oil pressure will not reach the outer parts of the engine and will eventually cause a lot of damage.


Why is an oil pressure gauge spiking then back down to normal on a 3800 engine?

Oil pressure gauges are notoriously inacurate. Pressure should be high when the engine is cold, or the accelerator is pressed hard. It's also possible the sensor is damaged.


Can a 2000 jeep 4 liter 6 cylinder camshaft sensor-oil pump drive fail and not drive the oil pump with the engine at temp but have oil pressure when engine is cold?

No, if the oil pump drive is working cold it will work hot. Low oil press when warm is due to internal engine wear.


What would cause low oil pressure on 351 ford?

low oil pressure is caused by, either low oil in engine or a bad oil pump


What would cause high oil pressure in a harley Davidson evolution motor?

I thought I had high oil pressure, When I would rev the engine the oil pressure would max out on the oil pressure guage. Luckily it just turned out to be loose connections to the oil pressure sensor. I tightened the terminals and the problem went away.


Purpose of an oil pressure sensor?

The oil pressure sensor sends a reading to the gauge so you can moniter the engine's oil pressure. No oil pressure means the engine is in big trouble.


Will a bad harmonic balancer cause fluctuating oil pressure?

No. The harmonic balancer does exactly what it says. It is to keep the engine from viberating. You need to install a manual oil pressure gauge and run the engine cold and hot to determine if you really have a pressure problem. Most likely you have a bad oil pressure sending unit.


What does it mean check engine gage light indicates oil pressure is low when starting 2001 ford explorer sport in cold weather?

It means that the oil pressure switch is showing low pressure.


Can a oil pressure switch stop the car from cranking?

Most cars would not have any oil pressure until after the engine starts turning because the oil pump is driven mechanically off of the engine.


What should one look at to diagnose a decrease in oil pressure during normal operation of 1984 Chevy 305: At cold engine start oil guage reads 30-45 but when warmer oil guage reads 0?

You need to have an oil pressure test run to determine if the oil pump is bad or the sending unit is defective. It could also just be a bad seal, or something to that effect. Check your oil fill cap and see if it is staying tight. It would make sense for the oil pressure to be higher at first when the engine is cold, because the oil would be thicker. Once it gets warmed up and thinner, the pressure should go down some, but not to zero.


Why it is not advisable to overfill the engine with oil?

If it is high enough to be splashed by the crankshaft it would foam up. That would cause a lack of oil pressure and engine damage.


What would cause the oil pressure on a 96 jeep Cherokee to go from 45-60 then slowly climb up to 80 psi and then come back down again when you let off the gas?

The oil pressure is created by the oil pump which is mechanicly driven inside the engine. When oil is cold it is thicker so oil pressure is higher, as it warms it thins and lowers the pressure slightly. When you rev the engine up the oil pump pumps faster, therefore raising the pressure in accordance with the rpm. Those readings sound fine to me. Hope this helps


Why would the oil light on a 1997 Camry 4 cylinder stay on after oil and filter was changed and levels are all correct?

Oil PRESSURE is an indication of the condition of the engine's bearings. If the oil pressure is low, the engine is about ready to quit.


Oil pressure light vw golf 1999?

oil pressure switch oil pressure low worn engine did you drive with no oil in for a long time are there any noises in the engine


Why would the oil pressure gradually decrease after a 1992 Buick Roadmaster has been running for a while but pressure maintain while driving?

Especially if you are in cold areas, it takes more pressure to circulate cold oil. When it warms up, the oil flows easier through the system reducing pressure.


Where would an Oil leak in the back engine of a Camaro 1991 RS be?

Engine seal? Valve cover? Oil pressure sending unit?


Would a faulty oil pressure switch stop the car from starting Renault clio alize?

Yes. However, the oil pressure switch may be accurate, in which case you have low oil pressure in the engine which can be caused by a faulty oil pump or clogged oil pump screen. Low oil pressure can cause serious damage to the engine. The oil pressure switch is shutting the engine down to prevent any damage. The best thing to do is take the car to a mechanic.


What does the oil pressure sending unit do?

Measures the engine oil pressure and sends this information to the oil pressure gauge.


What should the oil pressure on a 2003 Chevy Trailblazer be to qulify as in the normal range?

Anything above 5 psi at idle will lubricate your engine. There is no maxim oil pressure for a 2003 Chevy Trailblazer. When the engine is cold and the oil is thick you should see 60 to 80 psi.


Why would the oil light blink on and off when I'm stopped at a stop light but when in motion it doesn't come on at all?

Low oil pressure due to excessive engine wear (bearings) Defective oil pressure sending unit? Try a manual gauge to determine actual engine oil pressure Try a heavier engine oil i.e. 20W-50