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The term fuel injection is vague and comprises various distinct systems with fundamentally different functional principles. The only thing all fuel injection systems have in common is the absence of carburetion. There are two main functional principles of mixture formation systems for internal combustion engines: internal and external.
It sold in low volumes (less than 15% of the HSC engines built) and was costly due to the tooling changeover required for the taller deck height. The earliest 2.5 L came standard with electronic multi-port fuel injection. It received sequential fuel injection in 1991, raising output to 105 hp (78 kW) and 140 lb⋅ft (190 N⋅m) of torque.
They also feature exhaust gas recirculation (EGR), secondary air injection, and Multec M engine control with sequential multiport fuel injection. The 1.6 L version was also exported for use in the Brazilian Corsa GSi.
It was built from 1991 to 1997. From 1991 to 1993, it used tuned multiport fuel injection, and made 200–210 hp (149–157 kW) at 5200 rpm and 215 lb⋅ft (292 N⋅m) of torque at 4000 rpm. From 1994 to 1997, it used sequential port fuel injection, and made 210 hp (157 kW) at 5200 rpm and 215 lb⋅ft (292 N⋅m) of torque at 4000 rpm.
In 1994, all 2.2-liter engines were updated to sequential multi-port fuel injection and power increased to 120 hp (89 kW), with torque increasing to 140 lb⋅ft (190 N⋅m). The MPFI and SFI versions produced enough power to allow the 2.2 to replace the old Pontiac Iron Duke engine as the 4-cylinder offering in the S/T trucks and A-body cars.
It has a 10.2:1 compression ratio, Sequential multi-port fuel injection, and a bore and stroke of 94 mm × 85.6 mm (3.70 in × 3.37 in). Lower-powered versions only have variable cam phasing on the inlet cam (LE0). Selected models also include variable exhaust. The engine weighs 370 lb (170 kg) as installed.