Simple question.
So I see jeeps that are 4.0l and some are 4.0l HO (Like mine ;P) whats the difference? I would think it means more power right? Or does it have to do with the fuel injectors, or all of the above? Does anyone have the spec on this ?

High output engines have more torque and more horsepower, IE: a 2.8l V6 Chev HO puts out 128hp and 167torque, whereas the reg 2.8 turns 105hp and 128torque!

Somewhere is the early '90s(92' maybe) after Chrysler bought out AMC they switched from the old Renix FI system that AMC was using on the XJ to their own system. This along with some head changes brought up the HP maybe 10HP but at the cost of low end torque. Its not a big deal really. Both systems work well and put out comparable HP and torque. I would be more concerned with the Peugoet 5spd tranny that was mounted behind the non HO motors(upto 1990). They are only good for about 200,000 - 250,000kms and are NOT rebuildable.