Hesco is a good source for adjustable fuel-pressure regulators and larger injectors, as well as other 4.0L fueling components. Turbo City has an adjustable MAP sensor, or Edge Products offers an electronic controller as part of its Trail Jammer package that does essentially the same thing. Quick Specs Gas Mileage 15 mpg City/21 mpg Hwy Engine Gas I6, 4. In lieu of (or in addition to) an injector upgrade, you can try an adjustable MAP sensor so the ECU thinks the engine is under more load than it really is and will give correspondingly more fuel. However, OBDII ECUs revert back to pre-mapped fuel tables, so even if you bump up your injector size to 21-, 23-, or 24-lb/hr units, the computer will simply fire the injector for a shorter burst so it delivers the same amount of fuel your stock 19-lb/hr units would. For the earlier Renix and HO OBDI systems, you can simply install an adjustable pressure regulator or swap injectors to higher-flowing units to get a little more squirt into your cylinders. Adding fuel to a '96-up OBDII returnless Jeep injection system can be a tricky undertaking. Learn the ins and outs about the used 2004 Jeep Grand Cherokee-6 Cyl. and 7,400 lbs across various years and trims. Once you add the amount of air going in and out of your 4.0L, you can increase your fueling. Home Towing Capacity Jeep Grand Cherokee Jeep Grand Cherokee Towing Capacity (2002 - 2023) Researched By AutoPadre Last Updated Jeep Grand Cherokee Towing Capacity Overview The Jeep Grand Cherokee towing capacity ranges between 3,500 lbs.
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