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.Google+
Car Problem Reports
Nissan Murano Failing Engine Mounts Will Cause Thumping in Floor
Nissan Murano Problem
Average Mileage: 90,187 mi (13,000 mi - 243,000 mi)
I have a 2007 murano that I have had a problem since it was under 36K. It has a drone in the motor when under a load at approx. 1500rpm and 40mph. You can feel a slight vibration in the drives compartment and in the pedals. I have been to 3 dealerships and it is currently at the forth for repairs. I have been told to replace the tires, exhaust and trans. fluid. nothing has fixed the problem and I have been told the the motor mounts are more than likely the problem but it is a $1500.00 guess. I do not feel that a vehicle of this price (fully loaded) should be having a problem like this with such low mileage.
Visitor, 2006 Nissan Murano, 68,000 mi
I felt thumping in the floor board also vibration and loss of power I did have the moter mounts fixed and paid $625.00, is this a fair price?
Visitor, 2005 Nissan Murano, 75,000 mi
Complined to dealer of clunk or thump heard in front and felt in stearing column on hard acceleration from stop. Dealer advised three motor mounts cracked and need repair.
Visitor, 2007 Nissan Murano, 93,000 mi
I've had the exact same problems as everyone else and I'm sure they are aware of the problem but my question is, why haven't they did a recall on these things? I love my Murano but after this I will never purchase another one new or used. I love Nissians period but next I think I'll try Honda!
Visitor, 2004 Nissan Murano, 243,000 mi
Same thump when you accelerate and vibration in steering
Visitor, 2006 Nissan Murano, 45,000 mi
Motor mounts replaced under my Nissan Extended Warranty
Visitor, 2005 Nissan Murano, 55,000 mi
Everyone... Go to Rockauto.com. Dirt cheap prices.... Motor mounts were extremley cheap as well as other parts i had to purchase. Lower right and left arm were damaged as well and they cost about a 3rd less than dealer or autozone....
Visitor, 2003 Nissan Murano
A knocking noise on the floor changed the struts and that wasn't the problem it's the motor mounts
Visitor, 2004 Nissan Murano, 114,000 mi
I had a "knocking noise' when accelerating. My mechanic is working on it now and says 2 mounts are damaged. They quoted over $700.
Visitor, 2004 Nissan Murano, 67,000 mi
Thumpin And Loss Of Acceleration