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Re: the engine lost power and oil
If the oil is disappearing with no visible stains on the ground, there are a couple possibilities. One is that it's leaking out under the car while driving, and blowing out along the bottom of the car and on the road as you drive. Look at the bottom of the car and see if you see streaks of oil.
If not, and you're down on power, it's possible that you have a head gasket leak that is allowing oil to be burned in the combustion chambers. Do you have visible blue smoke from the tailpipes, especially when revving the engine? Blue smoke is a telltale sign of an engine burning oil.
How quickly are you losing oil? Can you top it off and then check the dipstick regularly to see how quickly (mileage-wise) you're losing it?
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If your oil pressure light was on, but the oil level is OK on the dipstick, it seems that the engine lost oil pressure due to a failed pump (a rare thing to happen) or a blocked filter, or sludging in the engine.
The first thing to do is replace the oil pressure sender unit with a pressure gauge, and idle the engine for a few seconds to get a reading. If it reads zero, the engine may already be damaged. That loss of power sounds like the engine was beginning to seize.
If the car died and then the oil light came on than that is normal. If you lost oil pressure the light would come on and the engine would continue to run for a little while until it seized up. If this where the case it would have made a lot of noise and you would have felt a gradual loss off power until the engine finally stopped. I suspect the oil light came on after it stalled. If this is the case the first thing to check would be spark or fuel pressure. Crank sensors and fuel pumps are the two most common issues that would cause the engine to stall.
The oil light can only come on for two possible reasons:
1.Your oil pressure switch is defective and is "lying" about how much oil pressure you have. In this case, replacing the oil pressure switch will fix your problem. (This needs to be checked FIRST)
2. You actually have low oil pressure. The main reasons for low oil pressure are worn out engine bearings (making it time for an engine replacement or overhaul) and debris getting stuck in the oil pick-up tube screen. I have fixed many of these by removing the oil pan and cleaning the debris out of the oil pan and oil pickup tube. Many times, sloppy repair work on various parts of the engine will result in pieces of gasket material and chunks of silicone that get trapped in the pick-up tube and cause the symptoms you are describing. The way to go about this is to remove the oil pan and inspect the contents to see what is going on. If there are a lot of metal particles, then the engine bearings are damaged. If there is just a lot of junk and debris (with no metal particles) like described above, simply cleaning it out will likely solve your problem.
these cars suffer from oil pump problems and sludging of the oil. its probably going to be an engine out job as youll need the sump removed to get to the oil pump and pick up pipe. theres not a lot of room you might be lucky and just raise the engine enough but theres quite a lot to remove from the engine to do the job. hope this helps
Sounds like and electrical problem in the oil pressure sensor circuit. I wouldn't rebuild the engine just yet. Hook up a mechanical oil pressure gauge and drive the vehicle with the gauge on it so you know exactly what the oil pressure is.