A thumping heard and felt in the floor is often caused by failing engine mounts. A failing mount allows too much movement of the engine, and will require replacement.
Car problem reports
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Most reported 2003 Nissan Murano problems
A damaged or broken seat adjuster assembly on the seat bottom can cause the seat to rock back and forth and possibly squeak. It can also cause the seat to not adjust forward or backward, or up and down.
A faulty fuel damper can produce a ticking noise, which can be heard inside the cabin when the engine is idling. Replacement of the failed dampener should correct this problem.
The fuel filler door actuator relay can fail and prevent access to the gas cap.
A creaking or clicking heard while the vehicle is accelerating can be caused by dirt and corrosion build up between the splines of the front hubs and CV axle shafts.A creaking or clicking heard while the vehicle is accelerating can be caused by dirt and corrosion build up between the splines of the front hubs and CV axle shafts. Removing, cleaning, and applying a light coat of grease on the axle shaft splines will commonly correct this concern.
My 2003 consumes fuel so so so much and when am driving,if i slow down to climb a speed braker,i have to step on the acceleration so hard before it will pick and all of a sudden it will pick up at once but it cease at first before picking.Could the problem be the fuel pump? If the fuel pump is bad,could it make the car consume fuel so much?