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I don't know if it is available that far back, but with my '03 I just had to get on the Jeep website and email them the last 8 digits of my VIN # and they sent me a 4 page build sheet that showed EVERYTHING that was on the Jeep. It was pretty neat to get and it only took about 4 hours to get it!!
 

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Discussion Starter · #6 ·
hey herrin. Ive waited all day today and nothing. Am i supposed to enter that reference number in somewhere or did they jsut respond back to you?
 

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Best I could find for now:

'91 2.5-L 4 cyl. comes with Electronic Fuel Injection (EFI)
Replaced 4.2-Litre inline 6 with 2-bbl carburetor with 4.0-L inline 6 with EFI. Max. torque increased from 210 ft-lb @ 2000 RPM to 222 @ 2,800 RPM.

Nothing changed untill 97, so it should be atleast the same torque spec for 94.
 

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Here ya go george, a little searching and wikipedia here's what I found!!

"In 1991 Chrysler Corporation, then the owners of the Jeep brand, redesigned the RENIX engine control computer and raised the intake ports approximately 1/8″ 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 lb-ft (305 N·m) of torque. Badging on 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 make the engine more sensitive to alterations, especially where emissions are concerned."
 
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