Need help with my 4.0L V6 5 speed 4WD 190,000 mile Ranger. Over the last couple thousand miles the truck has been losing power. Now it will not go over 70mph and it takes some time and effort to get to 55mph. Gas mileage has dropped from 18 to less than 12mpg. It idles fine and does not seem to misfire on acceleration, it just won't accel. Changed plugs, with no noticable difference. Plugs were a rust brown color, not light tan that I was hoping for. Oil looks fine. Check engine light has not come on. If I try hard to accelerate or go above 70 the engine pings and the temp guage rapidly starts to climb. Any ideas?
- posted
18 years ago