of the US-market 4A-GE engines came with a MAF sensor. For US-market cars, this revision increased the power to at 7200 rpm with a torque of at 4800 rpm ( and ). In non-US market cars, this revision produced at 7200 rpm and torque at at 4800 rpm. The 4A-GE engine was first introduced in the 1983 Sprinter Trueno AE86 and the Corolla Levin AE86. The AE86 marked the end of the 4A-GE as a rear wheel drive (RWD or FR) mounted engine. Alongside the RWD AE86/AE85 coupes, a front wheel drive (FWD or FF) Corolla was produced and all future Corollas/Sprinters were based around the FF layout. The AW11 MR2 continued use of the engine as a rear mid-engine, rear-wheel-drive layout, transversely-mounted midship. The engine was retired from North American Corollas in 1991, although it continued to be available in the Geo Prizm GSi (sold through Chevrolet dealerships) from 1990 to 1992. All 4A-GE engines (including the 20-valve versions below) feature a forged crankshaft rather than a cheaper and more commonly used cast version. Clarification: In the U.S. market, the 4A-GE engine was first used in the 1985 model year Corolla GT-S only, which is identified as an "AE88" in the VIN but uses the AE86 chassis code on the firewall as the AE88 is a "sub" version of the AE86. The 4A-GE engines for the 1985 model year are referred to as "blue top" as opposed to the later "red top" engines, because the paint color on the valve covers is different, to show the different engine revision, using different port sizes, different airflow metering, and other minor differences on the engine. The American Spec AE86 (VIN AE88, or GT-S) carried the 4A-GE engine. In other markets, other designations were used. Much confusion exists, even among dealers, as to which models contained what equipment, especially since Toyota split the Corolla line into both RWD and FWD versions, and the GT-S designation was only well known as a Celica version at that time. In 1993, the 4A-GE engine was dropped and replaced with the 7A-FE in South Africa even as other countries moved towards the 20-valve 4A-GE, as South African fuel was not suitable at the time for the 20-valve 4A-GE engines. Applications AA63 Carina 1983.06–1985 (Japan only) AT160 Carina 1985–1988 (Japan only) AT171 Carina 1988–1992 (Japan only) AA63 Celica 1983–1985 AT160 Celica 1985–1989 AE82 Corolla saloon, FX 1984.10–1987