What can I do

Sound like low engine compression
head gasket gone between the cyl

Hi again Kelea, I'm glad to help!

Kelea, if you do not hear a lot of engine rattling noises then I would say your "Oil Pump" is OK and you need to replace the "OIL SENDING UNIT" which you can buy at Autozone. CAUTION: If you do hear a lot of rattling noises coming from your engine then I'd suggest having someone check the oil pressure. If the oil pressure is low then it could be all kinds of things that can cause low pressures. From engine bearings, to restrictions, to the oil pump itself. I would start with the oil sending unit first and see what your oil pressure looks like. If your oil pressure is good after replacing the sending unit then I'd consider never taking my vehicle back to the shop that told you it was the pump. Hope this helps and have awesome day.

Sounds like the main bearings are probably going.
Did you pull a couple of caps and look at the bearings when you had the pan off ?
It could be dirt in the passages but probably wear on the crankshaft.
As oil warms up it thins out and pressure is lost thru gaps in the bearings.

Try some thicker oil , you have a worn component inside the motor, there is not enough oil pressure when the car first starts does this happen at an idle in gear?.

Hi. This issue has several causes, but the oil light indicator is a strong sign of low pressure in the engine. This will cause the engine lubrication rate to drop, thus, producing a illuminated oil light, and erratic Oil pressure readings. The necessary actions are to have a manual oil pressure test ran on this engine, asap. When running a manual oil pressure test, you will discover if the true oil pressure is low, or normal. If the test proves that the oil pressure is, indeed, low, this will confirm that the Oil pump is suspect.

Now, if the true readings given during the manual oil pressure test are indicating that the pressure is normal, this will be the result of a failed sending unit(oil pressure switch). Although the oil pressure is suspect, this is not your only issue here. There seems to be a abnormal compression rate, present. This is causing the rough idle, and erratic RPMs. I recommend to administer a engine block compression test, as well. This test will discover if , indeed, there are issues within the cylinder heads, and block structure, such as a worn head gasket, cylinder wall issues, and cracked block. Normally, these issue will send signs, like white, or gray smoke out the tail pipe, or discolored oil. It will, also, promote erratic RPM ratings, and a rough idle. Have the oil pressure test, and engine block compression test ran, asap.

Once the test are administered, you will be able to isolate the actual problem areas, more accurately. Check the spark plug wire sets, and ignition assembly for faults, also.

Hi. This issue has several causes, but the oil light indicator is a strong sign of low pressure in the engine. This will cause the engine lubrication rate to drop, thus, producing a illuminated oil light, and erratic Oil pressure readings. The necessary actions are to have a manual oil pressure test ran on this engine, asap. When running a manual oil pressure test, you will discover if the true oil pressure is low, or normal. If the test proves that the oil pressure is, indeed, low, this will confirm that the Oil pump is suspect.

Now, if the true readings given during the manual oil pressure test are indicating that the pressure is normal, this will be the result of a failed sending unit(oil pressure switch). Although the oil pressure is suspect, this is not your only issue here. There seems to be a abnormal compression rate, present. This is causing the rough idle, and erratic RPMs. I recommend to administer a engine block compression test, as well. This test will discover if , indeed, there are issues within the cylinder heads, and block structure, such as a worn head gasket, cylinder wall issues, and cracked block. Normally, these issue will send signs, like white, or gray smoke out the tail pipe, or discolored oil. It will, also, promote erratic RPM ratings, and a rough idle. Have the oil pressure test, and engine block compression test ran, asap.

Once the test are administered, you will be able to isolate the actual problem areas, more accurately. Check the spark plug wire sets, and ignition assembly for faults, also...

READ THIS (happy ending so far...):
audi a4 2L turbo quattro, manual transmission with 98,000 KM. Perfect conditions, no oil leaks whatsoever.

Left the car off for two weeks in very cold weather (-10C down to -25C). When I restarted, it started immediately but with heavy rattling noise due to camshaft adjuster not getting enough oil pressure. After 3 minutes of warming up (outside temp.: -12C) at very low rpm (below 2,000rpm), I start moving the car. Still hearing heavy rattle noise. As soon as I pass 2,000 rpm, I get a scary red warning, low oil pressure. Turn off the engine immediately. In 1 minute, I re-start the car and the engine lights check ok, so I drive in first gear super slow (1,200rpm) hearing the same rattling noise. After another minute, finally the noise all the sudden disappears and the car starts running just fine.

Called Audi dealer and they told me that in extreme weather conditions, I should warm the engine for 10-15 minutes if necessary before start moving.
Take away: luckily, I didn't screw up the engine since I was using it at extremely low rpm (easy to do with clutch and manual transmission) until the oil reached full pressure. I am pretty sure now that the problem was leaving the car off for such a long time in freezing weather. All the oil flows back to the bottom, and when I restarted it, the cold oil with high viscosity took a long time to reach all the parts of the engine, specially the camshaft adjusters that are actuated by using oil pressure. Next day, the car started at -9C perfectly without making any noise (as usual). Basically, the longer you leave your audi in cold weather, the longer you might hear the rattling noise until the oil reach full pressure inside the engine. My car took 6 minutes to fix it after couple of weeks in cold weather. This makes sense to me; in fact, in the past I only heard the rattling noise after leaving the car off for a couple of days in the winter.
So far, this has had an happy ending....

Does the engine sounds like it is rattling when it runs? LIke the oil pressure is low. It might be a oil pressure sensor. If it is rattling then start with an oil change.

I don't know too much about the oil pumps in the Twin Cam engines. I have never worked with one of them but I've got extensive experience with the older type pump used on the Shovelheads and Evolution engines.

A Harley engine employs a high volume low pressure oiling system. The old Shovelheads would actually show no oil pressure when idling hot with most gauges. The oil pressure switch would cut the light off at four pounds of oil pressure. A Harley engine will not hold a lot of oil pressure because the engine is built using roller bearings instead of shell bearings.

As long as the tappets are not rattling, you don't have a problem with oil pressure. If your oil pressure drops too low, the tappets are hydraulic and they will rattle like hell. There will be no doubt in your mind as to the problem.

Now, back to your question as to why the oil pressure on your bike drops when accelerating under a load, I have no idea.

Good Luck!
Steve

You are losing oil pressure! Don't run the engine without the proper repairs!!
Check the oil level, if it's in the safe range, then it's possible that the oil pump is not working(this is a major deal, and could be a sign of other problems...if there's something plugging up the screen on the pickup tube, it could mean that something's coming apart inside the motor. I would drain the oil, and run it through a strainer to check for metal or plastic particles in the oil that could be from pistons, rings, timing gears... but dont' continue to run your engine without the proper oil pressure! the guage flickering means that it's dropping to unsafe pressure! a solid light means you've lost oil pressure.

... If there's no oil on the dipstick, add oil 1 quart.. and then recheck... add more as needed, but don't overfill.
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