what size engine?
- Thread starter ricpope
- Start date
Wrangl3r93
New member
How many cylinders? And what year xj?
Wrangl3r93
New member
Carb or fuel injection?
ricpope
New member
there are not any straight six carb cherokees from the factory, it has the renix setup. do you have any idea what the markings on the side of the motor mean? thank you very much. btw are there any trails in the nashville area?
Wrangl3r93
New member
I thought all the inline 6's were carbed until '91? But a quick check of wikipedia proves me wrong and states that in 1987 the I6 was changed to a 4.0 liter with the renix set-up.
The first 4.0 engines in 1987 had RENIX (Renault/Bendix) engine control systems, which were quite advanced for their time, but are now handicapped because there are very few scan tools which can be "plugged in" to a RENIX system for diagnosis. The Renix also used a very advanced engine knocking sensor, which allowed the computer to know if detonation was occurring, thus allowing the computer to make the appropriate changes to prevent this.
The 1987 RENIX 4.0 made 173 hp (129 kW) and 220 ft·lbf (298 N·m) of torque. In 1988 the 4.0 received higher flowing fuel injectors, upping output to 177 hp (132 kW) and 224 ft·lbf (304 N·m).
In 1991 Chrysler Corporation, having bought AMC, were the new owners of the Jeep brand. Chrysler redesigned the RENIX engine control computer and raised the intake ports approximately 1/8-inch (3.175 mm) for a better entry radius. Chrysler also enlarged the throttle body and redesigned the intake and exhaust manifolds for more efficiency, and the fuel injectors were once again replaced with higher flowing units. The camshaft profile was also changed. The net result of all these changes was an engine that made 190 hp (142 kW) and 225 ft·lbf (305 N·m) of torque. Badging on most Jeeps equipped with this engine read "4.0 Litre HIGH OUTPUT". The new cam profile combined with altered computer programming eliminated the need for an EGR valve and knock sensor, but made the engine more sensitive to alterations, especially where emissions is concerned.
P.S.- Turkey Bay isn't too far off, Wheeling in the Country and Wooly's are both close also. All three of those parks are good and I just found Windrock which is a little closer to Knoxville, only been once but it was a nice place to ride.
The first 4.0 engines in 1987 had RENIX (Renault/Bendix) engine control systems, which were quite advanced for their time, but are now handicapped because there are very few scan tools which can be "plugged in" to a RENIX system for diagnosis. The Renix also used a very advanced engine knocking sensor, which allowed the computer to know if detonation was occurring, thus allowing the computer to make the appropriate changes to prevent this.
The 1987 RENIX 4.0 made 173 hp (129 kW) and 220 ft·lbf (298 N·m) of torque. In 1988 the 4.0 received higher flowing fuel injectors, upping output to 177 hp (132 kW) and 224 ft·lbf (304 N·m).
In 1991 Chrysler Corporation, having bought AMC, were the new owners of the Jeep brand. Chrysler redesigned the RENIX engine control computer and raised the intake ports approximately 1/8-inch (3.175 mm) for a better entry radius. Chrysler also enlarged the throttle body and redesigned the intake and exhaust manifolds for more efficiency, and the fuel injectors were once again replaced with higher flowing units. The camshaft profile was also changed. The net result of all these changes was an engine that made 190 hp (142 kW) and 225 ft·lbf (305 N·m) of torque. Badging on most Jeeps equipped with this engine read "4.0 Litre HIGH OUTPUT". The new cam profile combined with altered computer programming eliminated the need for an EGR valve and knock sensor, but made the engine more sensitive to alterations, especially where emissions is concerned.
P.S.- Turkey Bay isn't too far off, Wheeling in the Country and Wooly's are both close also. All three of those parks are good and I just found Windrock which is a little closer to Knoxville, only been once but it was a nice place to ride.
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