Since its introduction in 1973 the Honda Civic has earned a reputation as a reliable vehicle. Regardless, engine problems can occur, especially in older models or vehicles subjected to improper maintenance. Some problems can result in lubricating oil leaking into the cylinders, causing a characteristic blue smoke to come out of the exhaust pipe. It is important to identify the cause of the oil burning so that the problem can be repaired as quickly as possible.
Check the coolant in the cooling fluid reservoir and in the radiator. If the cooling fluid is dark brown, or if there is oily scum floating on the surface, it is likely that the engine head gasket has failed.
Check the compression of each cylinder. Low compression in one cylinder likely indicates that the piston rings or the valve seals are worn or damaged. To determine which, put a teaspoon of motor oil into the cylinder and repeat the compression test. If the compression increases the problem is the piston ring. If the compression remains low the problem is the valve seal.
If compression is low in two adjacent cylinders it likely indicates a head gasket failure. Low compression in all cylinders indicates that the piston rings, and perhaps the cylinders, are worn.
Check the PCV valve. Remove the hose from the valve and start the engine. Tap your finger on the exposed PCV valve opening. If a vacuum is present then the valve is working properly. Check the hose for blockage.
Check the engine oil pressure by connecting an oil pressure testing unit according to the manufacturer's instructions. High oil pressure usually indicates that oil passages in the engine are plugged with sludge. Low pressure is likely an indication of problems with the oil pump or excessive wear on the crankshaft bearings.
