Damage to the platinum rivet will result.ĭo not use a wire-type gapping tool for the same reason. (Featuring a platinum rivet located on the tip of the center electrode)ĭo not substitute any other spark plug on the 4.7L H.O. “Fired in suppressor seal” type spark plugs using a copper core ground electrode. (located under intake manifold, one bolted on each side)Īt curb idle: 13 psi rpm & above: 37-75 psi Specifications for the HO engine that are different from the standard V8 are noted in red. This was, unfortunately, decontented starting with 2003 model year production. All 2002 models with the HO engine featured a nice custom chrome exhaust tip. It has not been available on the Laredo, Laredo Sport or SE (Special Edition) models. In the 2004 model year, Jeep offered the HO as an option on three special models, the Freedom, Columbia and Rocky Mountain editions. The HO engine is standard on all 2002-2004 Overland models, and is optional on the 2002-2004 Limited 4WD models.
The HO engine is designed to run perfectly on standard octane fuel, but for maximum performance premium fuel is recommended. The performance modifications added 30 horsepower and 30 Ft.-Lb. An incredibly detailed tech analysis, written by Richard Ehrenberg in 1999, can be found here: Chrysler's New Cammer.Ī High Output version of the 4.7L was introduced starting with the 2002 model year. The all-new 4.7-liter V-8 engine offers more power, less weight (438 lbs), increased fuel efficiency and lower emissions than the 5.2-liter engine it replaced. These refinements added more power (10 bhp), a 5db quieter operation with an enhanced lower "throaty" sound quality, and cleaner emissions.įor comprehensive 4.0 perfomance information and specifications, visit Dino's JEEP 4.0 performance site. Upgrades included new cylinder heads with reduced-area exhaust ports, new exhaust manifolds, a new 50% more efficient slitter-vane water pump that added two horsepower, a new elastomer-coated steel intake manifold gasket, a two-piece high silicon-molybdenum alloy cast-iron exhaust manifold, automated belt tensioner and a new laminated oil pan. The standard in-line 6 cylinder engine was significantly reengineered in 1999. Jeep has used three different engines for the WJ series (plus a couple of 5-cylinder diesels for the export market): Jeep Grand Cherokee WJ - Engine specifications
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