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Discussion Starter · #1 ·
Just bought a 2020 Altima pre owned with just under 5000 miles, and had a performance question. When I am coasting at around 40 mph, and slow down slightly, and then accelerate slowly back to 40ish, there seems to be an engine rumble. when slowing and re accelerating to a slow speed theres a low grumble. Once speeding up more its fine. Maybe its normal? It has that CVT transmission and chassis control feature, so maybe its normal. Its not loud or anything. No issues that i know of. Was Certified at dealership. Could just be how it is at those low speeds when breaking and accelerating.

Also, when breaking, theres this slight brief surge before coming to complete stop. When coming to a stop its smooth, but near the end of the complete stop theres a very slight surge before fully stopping, Not sure "surge" is the best word. Something kind of gives. But no dash board warning lights or anything. Could be nothing.

Anyone else have a 2020 Altima that can relate?
 

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We call the first issue you're having the "Old Lady noise" because they only do it when you're lightly on the pedal, especially uphill. The Alties from '13-up all do it. It's the Torque Converter trying to stay locked while the engine is lugging. It's a gas-saving feature, keeping the TC in lockup for as long as possible, but with light pedal it has the side effect of causing vibration in the exhaust which translates into panel-drumming when it reaches the back of the car. Depending on what conditions you're braking from, you could be feeling the TC release before a stop as well. That will cause a tiny surge in engine RPM as the TC clutch lets go.
 

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Discussion Starter · #3 ·
We call the first issue you're having the "Old Lady noise" because they only do it when you're lightly on the pedal, especially uphill. The Alties from '13-up all do it. It's the Torque Converter trying to stay locked while the engine is lugging. It's a gas-saving feature, keeping the TC in lockup for as long as possible, but with light pedal it has the side effect of causing vibration in the exhaust which translates into panel-drumming when it reaches the back of the car. Depending on what conditions you're braking from, you could be feeling the TC release before a stop as well. That will cause a tiny surge in engine RPM as the TC clutch lets go.
Appreciate that It makes sense. Thank you :)
 
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