Closed loop means there are sensors that monitor the water temperature, the crankshaft position, the oxygen in the tailpipe, the manifold pressure, etc. There are cheaper Throttle body kits available (Howell), but they are not closed-loop. It can be serviced at any Jeep dealer, if needed. The system consists of all new parts for a 1995 Jeep. This system is designed and made by Jeep as a complete upgrade package. So I got rid of it all and replaced it with a Mopar Closed-Loop tuned-port fuel injection system, complete with computer. They never run right, are very expensive to repair and no mechanic can troubleshoot the mysterious vacuum leaks. The biggest problem with this Jeep model is the notoriously bad carburetor and emissions system. I also put a new exhaust and muffler on last year, sounds quiet. Front brakes were replaced a few years ago and are fine. Last winter I put on new Raybestos rear brakes and had drums turned. I still get compliments every time I drive it. We have owned it since new and it has been a great vehicle.
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