Humming Noise when accelerating and under load

[LittleRock80]

Will do. Thank you.

 

[Freddyfoxx]

Figured out that it was the kazoo tsb. Fixed

 

[Freddyfoxx]

Hi guys, I've had this noise:
Have 203K miles on it. Would appreciate it if you can help. It happens when the temperature is hot outside like above 90C. It happens at highway speeds. It sounds as if I'm riding on off road or oversized tires but mine are standard Michelins. thanks in advance.

Turned out to be the kazoo noise tsb. Fixed. it's heard at high speeds especially with high cross wind. There's a leak in the weather stripping causing a noise. It's hard to diagnose since everyone thinks it's coming from tires or something. Simple fix by putting some sort of filler in the weather stripping near the top of the driver side window: Cross Wind front window noise TSB Update. - https://www.tacomaworld.com/threads/cross-wind-front-window-noise-tsb-update.530653/

 

[Freddyfoxx]

For the past 2-3 months, there is a humming/low frequency sound, that appears to be coming from the left front. It is louder when accelerating, and does away as the trans shifts gears, and then reoccurs as you accelerate under increased RPM's. At cruising speed it is not there. However as you accelerate, you do hear it. Seems tied to shifting and engine RPM. Seems more pronounced on uphills?

Trans was serviced 5000 miles ago, and shifts very smoothly, both upshifts and downshifts. No slippage at all. Noise has not gotten any louder. No vibration in th floorboard, and normal slight vibration in the shifter, same as when the truck was new.

Seems to occur under load while accelerating. No noise at cruising speed in OD.

Any thoughts? Thanks

If you are still having this issue, it maybe the Kazoo noise. it's heard at high speeds especially with high cross wind. There's a leak in the weather stripping causing a noise. It's hard to diagnose since everyone thinks it's coming from tires or something. Simple fix by putting some sort of filler in the weather stripping near the top of the driver side window: Cross Wind front window noise TSB Update. - https://www.tacomaworld.com/threads/cross-wind-front-window-noise-tsb-update.530653/