DIY Fuel Injector Upgrade: Transforming Your YJ Jeep’s Performance
This Simple Jeep Hack Will Transform Your YJ’s Performance The humble YJ Jeep Wrangler is a capable machine, but like any vehicle, it has its quirks. One of the most notorious is the factory single-port fuel injector system, which often leaves owners frustrated with rough idling, difficult cold starts, and lackluster fuel economy.