My car started making a knocking noise after I gunned it pulling out onto the highway, why?

Asked by Dec 08, 2014 at 04:28 PM about the 2007 Suzuki SX4 Base AWD

Question type: Maintenance & Repair

It only makes the knocking nice
when I need to shift from one gear
to another.

2 Answers

11,945

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.

5,565

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.

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