Thump from hybrid (like a bass drop)

[DWN2RTH]

I've had the LX for four days now and it's been bittersweet. The ride is exceptional and the looks of the OT in Earth is absolutely amazing and eye catching. The bitter part is that every time the vehicle is slowed, or stopped and at idle, the engagement of the gas motor causes a thump that sounds like a bass drop in music. It's often louder than the actual bass in my music. And it's not just the sound, when this occurs during deceleration, there is a leaching feeling like the brakes temporarily fade and not it doesn't stop in a linear fashion (jerky). Took to the dealer, they said it's normal. But............if that's the case, then why doesn't the Sequoia or Tundra with the iForce do the same thing?? I drove several before this purchase and can definitely say that I have never felt or heard this thump in any of the other 700's or Toyotas.

Has anyone else experienced this? If so, what were you told or what was the fix?

 

[ShottsCruisers]

Hmm...2500 miles on mine. I do get the various sounds this baby makes. Varies by motor on or off, idle vs step on the gas, blah blah. None of the sounds bother us at all because overall the thing is super quiet and smoooooth. That said...when we're idling for some time the motor will kick in. Most of the time the noise (yes, lower freq) is slight. You simply hear it start. But every now and then it will boom when the motor kicks in at idle. Not sure why...but it's random and it doesn't bug us.

 

[DWN2RTH]

Thanks for the info. Mine was pretty serious and it also caused a bit of inconsistencies in braking. I returned it for a full rewind of the deal two days after purchase and after an inspection from service, which as expected said it was “ normal”. It was really hard as I love the look and quiet of the vehicle overall.

Back to shopping.

 

[ShottsCruisers]

Thanks for the info. Mine was pretty serious and it also caused a bit of inconsistencies in braking. I returned it for a full rewind of the deal two days after purchase and after an inspection from service, which as expected said it was “ normal”. It was really hard as I love the look and quiet of the vehicle overall.

Back to shopping.

Oh ya...you mentioned braking. Hmmm...no issues with ours.

 

[henke]

Yes, mine does too. But, it's no more loud than other low frequency noises from when you run over a bump or something similar.

I just notice it more because I subconsciously associate it with my actions controlling the engine. Otherwise it fades into the background for passengers.

It's also strange that it doesn't seem to happen with the auto stop start with the 600.

Not a deal breaker for me, but maybe they'll come out with a muffler or a diffuser or something...

 

[ShottsCruisers]

The LX600 doesn't do this because it simply starts with a starter like any other vehicle. The 700h engine starts from the hybrid system/motor, thus the difference (though not sure why this would not be as smooth).