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Designed to make your 1981-90 Jeep vehicle more efficient and powerful. The kit replaces the stock carburetor, intake manifold and other major components with multi-point injection (MPI). Each cylinder has its own injector that is activated sequentially according to the firing order to precisely control individual fuel requirements. These MPI Conversion Kits are self-compensating and run equally well from sea level to terrain above 12,000 feet. Mechanical components are based on production 1995 Jeep vehicle parts. The fuel pressure regulator plug is designed to be used with our rear mounted fuel regulator / fuel pump kit (Part # HESRMFPR1) where the stock regulator is eliminated from the fuel rail. For vehicle years 1997 and earlier, use 22.0 foot lbs. of torque. For all vehicles 1998 and later, use 17.0 foot pounds of torque. Remove the four bolts retaining the throttle body to the intake manifold. Remove and discard the throttle body gasket. Install the spacer (HESCO logo right side up) and gaskets, installing one gasket between the manifold and spacer and one between the throttle body and the spacer. Use the (4) 55mm cap screws and (4) washers to install the throttle body. Torque the bolts to 10-12 inch pounds. Remove the bolts retaining the throttle cable bracket to the manifold. Some Jeeps have two while earlier models will have three bolts. Place the black spacers beneath the bracket and install the 50mm bolts and flat washers. These also torque to 10-12 inch pounds. Dyno testing showed an 11 hp. Gain with an open air filter system. The typical power range differs with engine configuration. Jeep Push Rod Lengths Length Part Number Engine Year 9.639 PR-437 4.0L 1987-96 9.728 PR-399 4.2L 1989-90 9.700 PR-353 4.2L 1983-88 9.622 PR-333 4.2L 1977-80 9.594 PR-301 4.2L 1972-76 Stamped Rocker 9.656 PR-332 4.2L 1971-74 Cast Rocker Custom Length Push Rods 9.500 PR-310 Used with the aluminum head on decked engines. 9.547 PR-327 Used with the aluminum head on stock engines. 9.560 PR-310A 9.668 PR-303 Most of these push rods can be found on the web site in the "Valve Train" section. If you believe you need a length that is not listed call and we will be happy to try and accommodate your needs. You may also need a set of rocker arm shims to achieve the proper lifter pre-load even with a shorter push rod. The part number is HESRASK and can also be located in the "Valve Train" section.
Description This kit is computer controlled and will self adjust to run equally well at sea level to above 12,000 feet. Many components are based on '95 production Jeep parts that are readily available. The kit is emissions legal in all 50 states. Details
Bring your 258 engine into the 21st century. The MOPARĀ® Performance electronic fuel injection kit is the most comprehensive conversion kit on the market today. The kit replaces the stock intake manifold& carburetor and other major components to create true multi-port injection. Multi-port injection has a fuel injector for each cylinder that is activated sequentially in conjunction with the firing order to precisely control the individual cylinder's fuel requirements. This provides smooth trouble free operation that is free from flooding and flat spots. Installation Notes Installation Difficulty: Level 4Experts Only
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