My car started making a knocking noise after I gunned it pulling out onto the highway, why?
2 Answers
The engine will shift due to torque when the throttle is released. You may have lost an exhaust hanger and part of the exhaust may be hitting a cross member, frame, or floor boards when the engine shifts.
I believe it's a gas octane problem. Under a load it knocked. Maybe buy gas from a better station or go up to the next pump.