Engine Overview and Common Failures
The weight of the 4A-GE engine according to the catalog is 135 kg. The engine number 4A-GE is located to the right of the exhaust manifold. Knocking under the hood. Toyota A series engines are reliable and do not have any structural flaws, however, after a mileage of over 100,000 km, there may be a knock from worn piston pins. Before deciding on a repair, check the valve clearances, as they often cause the knocking. Electrical problems. Sensors are considered a weak point of the engine and electrical problems occur regularly. The sudden increase in fuel consumption is usually due to a burnt-out lambda sensor, when the temperature sensor is broken, the car constantly stalls or does not start at all, and fluctuating RPMs are caused by failures of the absolute pressure and throttle position sensor. Oil consumption. After 200,000 km, piston rings or oil control rings often wear out and oil consumption appears, which over time can increase to 1 liter per 1000 km. Minor breakdowns. This engine constantly bothers with minor issues, and it's not about reliability, but about its age. Fuel injectors or throttle quickly get clogged from poor fuel quality, causing the engine to misfire. The crankshaft seal often leaks oil, and the outdated ignition system also malfunctions.