Thread: 5.9L vs 5.9L
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Old 09-14-2009, 01:23 AM
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Sounds to me like the Truck and Jeep have different PCM Engine Calibrations from Dodge and Jeep. They probably assumed that the truck would be used for Tow and allowed for more Timing changes on the fly to retard timing if spark knock was detected....... Or just simply Jeep wants people to use PREMIUM Fuel so that they can claim better longevity or just have a classy appeal to it???? If the Jeep pings with 87 or 89 then the Compression, Spark Timing, or ECM's are different....?
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