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Haltech's 4AG wiring guide
The Toyota 4AG DOHC 16V engine General Information Cylinders 4 Displacement 1587cc Firing Order 1342 Cylinder Orientation (from drivers seat) Cyl1 closest to timing belt Model Variants 4AGE 1st gen Blue Early Big Port - USDM Vane MAF, JDM MAP, T-VIS @4200rpm, 9.4:1 comp. Batch fire injection, distributor ignition, 182cc injectors, 16 valve head 4AGE 2nd gen Red & Black Late Big Port - As above but all are MAP 4AGE 3rd gen Red Small Port - 10.3:1 comp, No T-VIS, stronger internals,USDM use MAF, 235cc injectors 4AG 20V 4th gen "Silver Top" - Switched inlet cam timing, 3x inlet...
