Could be rod bearings - not a good sign. This is a sign of pre-failure of the engine.
When the oil light is on, it means you have low oil pressure. This can be caused by low oil level. When you first start the car, the oil light will come on momentarily, then turn off to signify that proper oil pressure has been reached. An engine knocking usually indicates that the engine is about to stall.
change backup light 2002 cadillac deville
could be a loose connection on oil temp or pressure switch.
It is possible to repair the 1992 deville check engine light if it is malfunctioning.
There may be a leak in your pressure valve. Take it to a machanic to be checked out.
It can mean you have low oil pressure and it can mean that the oil sending unit is bad. Do not ignore this and have this checked out by a trusted mechanic.
Check oil pressure with a manual gauge. Could just be a bad oil sending unit or low oil presssure due to internal engine wear
If it is not working you have no oil pressure and the oil light will come on or the oil pressure gauge will drop to 0. You will also hear engine noise, as in, pecking, or knocking. Engine will also overheat very quickly.
Remove oil sending unit and install a mechanical gauge to actually test oil pressure Low pressure may be caused be worn internal engine parts (bearings) or a weak oil pump
The check engine light on a 1999 Cadillac DeVille can be reset by disconnecting the battery for 30 seconds. The light will immediately come back on if the problem still exists.
The rod knocking is caused by loss of oil pressure. Did the oil light not come on? That light is red, red means stop. Do not start this engine again until the problem is corrected. You are probably looking at way more than just installing a new oil pump if the engine was run for very long without oil pressure. A complete overhaul may be in order.
It all depends on the nature of the 'knocking':Cheap gas - light rattle during acceleration indicating 'pre-ignition' is happening.light knocking all around the engine -low / expired engine oilLow oil pressure - plugged filter to failing oil pumpHard knocking - could be a piston coming lose and banging on the side of the cylinder walls - not good(!)Way too many variables to diagnose over the internet.Have the car inspected by a good, reputable mechanic