The Jeep 4,0L inline 6 cylinder engine was in use by AMC and later Chrysler as a prominent power plant for Jeeps from 1986 to 2006. This engine was designed with 1970's and early 80's technology and only moderately upgraded through its production life. It wasn't a modern engine in 1986 and it isn't a modern engine today.. Stop treating it like one!

In this video we will go over a simple "Saturday afternoon tune up" to try to bring a couple MPG back to the tired old 4.0

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We hope you enjoyed this video and will keep in mind that all information included is intended to be purely academic and in fact is only the opinion of D&E. We are not professionals, nor are we qualified to knight you a professional. D&E want to ensure that anyone modify or fixing their own vehicle does so in a safe manner which leaves the vehicle in a legal, roadworthy state. In short, DON'T BE A MONKEY WITH A TOOL BOX! If you don't know what you are doing, leave it the professionals!