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1991 GMC Jimmy Engine Diagram and Component Identification Guide (2026 Manual)
"The 1991 model year represents a historic crossroad for the GMC Jimmy nameplate. In 1991, General Motors sold two distinct platforms sharing the Jimmy badge: the final-year full-size "Squarebody" K5 Jimmy (V1500/V2500 platform, often equipped with the 5.7L 350 cu. in. Small Block Chevrolet V8) and the compact S-15 Jimmy (S-platform, primarily powered by the 4.3L 262 cu. in. V6). While both engines utilize Rochester Electronic Fuel Injection—specifically the Throttle Body Injection (TBI) assembly—their physical layout, vacuum architecture, firing order, and accessory drive configurations differ substantially. Understanding the layout of your 1..."
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