4A-G Engine Codes (Primero en Ingles y mañana la traduccion por falta de tiempo)
Every Toyota “engine type” has a code consisting of numbers and letters. An “engine type” may actually be a family of engines spanning several design generations and encompassing different specifications or components.
The first character is always a number followed by one or two letters. The number indicates the generation. The letter(s) indicates the engine family.
Following the engine generation and family codes, there are different combinations of additional letters, each of which represent a specific engine characteristic:
C - Equipped with emissions control systems (note: The “C” is not used if the engine was originally equipped for emissions controls.)(The C notation has been associated with California’s (USA), at that time having stricter emission standards)
U - Equipped with emissions control systems for Japan. (The U notation has been associated with the introduction of Unleaded fuel available in Japan at that time)
E - Electronic fuel injection (EFI)
F - Gear coupled cam drive; dual overhead cam (DOHC) engine: timing belt or chain drives one cam, and “scissors” gear drives the other cam. [Narrow included valve angle]. The split “scissors” gear is a unique way to eliminate gear backlash.
G - Dual overhead cam (DOHC) engine: timing belt or chain drives both cams. [Wide included valve angel]
L - Transversely mounted in vehicle
T - Turbocharged
Z - Supercharged
A - SOHC, 8 valves
4A-C - SOHC, 8-valves, equipped with emissions control system
4A-LC - SOHC, 8-valve, transversely mounted, equipped with emissions control system
4A-GE - DOHC, 16-valve, fuel injected
4A-GEC - DOHC, 16-valve, fuel injected, equipped with emissions control system
4A-GELC - DOHC, 16-valve, fuel injected, transversely mounted, equipped with emissions control system
4A-F - DOHC, 16-valve, gear coupled cam drive, carbureted
4A-FE - DOHC, 16-valve, gear coupled cam drive, fuel injected
4A-ELU - DOHC, 16-valve, gear coupled cam drive, fuel injected, transversely mounted, equipped with emissions control system for Japan.
4A-GZE - DOHC, 16-valve, supercharged and fuel injected
The “A” block series is a versatile engine that has undergone many revisions.
The 1A-C started out as a 4-cylinder, SOHC, 1.5 liter carbureted engine which was introduced in the 1980 Tercel. It was upgraded in 1981 to the 3A-C. Changes to the cylinder head improved emissions control and performance. The 4A, introduced in the 1983 Corolla line, featured an increased displacement to 1.6 liters. It was available in several variations including the 4A-C, (SOHC, carbureted), the 4A-GE (DOHC 16 valve head, fuel injected), and the 4A-GZE (DOHC 16-valve head, supercharged, fuel injected.) In 1984 the 4A-ELU was introduced with improved helical ports with swirl control valves, programmed sequential injection and improved ignition system which helped the system in the ultra-lean, high efficiency lineup. The ‘A’ family of engines have been used primarily in the Corolla, AE82, AE86, AE92, AE101 & AE111, but can be found in the first generation MR2, AW11 as well as some lesser known Toyota models (Engine options may vary depending on the vehicles point of sale.) The 4A-F and 4A-FE engines have replaced the 4A-C in Corollas since 1988. In 1990 the A block deck height was lengthen, the crankcase slightly enlarged and a special oil pan extension was add to increase the displace of the A family to its largest, 1.8 liters. Its designation was the 7A.