For 1990-2009 cars only
| • | The oil level is low. Fill to the full mark on the oil level indicator. |
| • | The idle speed is slow. Refer to Engine Controls. |
| • | The oil pressure switch is incorrect or malfunctioning. Replace the oil pressure switch with a proper oil pressure switch. |
| • | The oil pressure gauge is incorrect or malfunctioning. Replace the oil pressure gauge with a proper oil pressure gauge. |
| • | The engine has improper oil viscosity or diluted oil. |
| - | Install oil of proper viscosity for expected temperature. |
| - | Install new oil if it is diluted with moisture or unburned fuel mixture. |
| • | The oil pump is worn or dirty. Clean or replace the oil pump. |
| • | The oil filter is plugged. Replace the oil filter. |
| • | The oil pickup screen is loose or plugged. Tighten or replace the oil pickup screen. |
| • | The oil pickup tube has a hole. Replace the oil pickup tube. |
| • | The connecting rod and/or crankshaft bearing have excessive clearance. Replace the connecting rod and/or crankshaft bearing(s) if necessary. |
| • | The oil galleries are cracked, porous, or plugged. Repair or replace the block. |
| • | The gallery plugs are missing or improperly installed. Install or repair the galley plugs as necessary. |
| • | The oil pressure regulator valve is stuck. |
| - | Check for the oil pressure regulator valve sticking in the oil pressure regulator bore. Repair or replace the oil pressure regulator valve as necessary. |
| - | Check the oil pressure regulator valve bore for scoring and burrs. Repair or replace components as necessary. |
| • | The camshaft is worn or poorly machined. Replace the camshaft. |
| • | The valve guides are worn. Repair the valve guides or replace the cylinder head as necessary. |
