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Engine bay of a 1993 Jeep Grand Cherokee with 4.0 L The 5 millionth Jeep 4.0 engine produced on the "Greenlee Block Line" dated June 15, 2001 The 242 cu in (4.0 L) engine was developed by AMC in just 26 months using many off-the-shelf components while featuring, among others, additional strength, improved combustion chamber, port setup, and cam ...
The AMC and Kaiser engines do not share bellhousing bolt patterns. Cam trouble on the 230 was common due to inadequate oil formulations of the time. Its under-square bore and stroke endeared the engine for low-speed torque. It was a dependable engine with reports of them going 250,000 mi. with no major problems—with proper maintenance.
Starting with the 1986 model year, the AMC straight-4 engines used a throttle body injection (TBI) or single-point, fuel injection system with a new fully computerized engine control. [3] In addition to cycling the fuel injector (pulse-width time, on–off), the engine control computer also determined the ignition timing, idle speed, exhaust ...
The single overhead cam V6 engine introduced in 1993. It was derived from Chrysler's first homegrown front-wheel drive V6, the Chrysler 3.3 engine. The SOHC V6 has been replaced by the Chrysler Pentastar engine. There are three major variants of this basic design: the 3.5 L, 3.2 L, and 4.0 L. Additionally, a 2.7 L DOHC version was developed.
The Inline 6 engine was also updated for MY1999. A redesign of the intake manifold added 10 horsepower (7.5 kW). While other Jeep vehicles used the Mopar 5 x 4.5 bolt circle, this was the first Jeep following the 1987 Chrysler buyout to receive a wider wheel bolt pattern: – 5 x 5 - (metric 5 x 127mm).
The Jeep Wrangler (YJ) did not get the AMC 4.0 L I6 engine until 1991, when Chrysler-designed electronics accompanied it. Until then, it retained the AMC 258 cu in (4.2 L) engine with a carburetor. No other Jeep vehicle was equipped with Renix electronic controls.