Random Rattle MANUAL Tacoma

I have a 2021 Tacoma TRD Sport Premium with this issue. Looking to see if anyone else has experienced and random rattle noise with their manual transmission tacos. It’s a couple second rattling noise and it sounds like it’s coming from the transmission, the noise will happen in any gear but never when in using the clutch or shifting a gear. I have taken the truck to Toyota dealer to see if they could see what it is and possibly under warranty but because it’s such a random noise I’m not able to duplicate it for them. The sound is similar to when the clutch is let out too much and not enough gas and right before it would stall. Horrible noise and it’s louder and quieter and times and is completely random when it happeneds. Does happen more when towing my cargo trailer at 4,000lbs.
Thanks for any feed back!

 

Welcome to the forum

It sounds like pre-ignition, sometimes called spark knock, octane knock or ping.
This is commonly caused by "lugging" the engine.

The engine is telling you it ain't happy and that it wants more RPM and more mechanical advantage (a lower gear) to do the work.
An automatic transmission will shift down as needed, the manual depends on the driver.

This engine had the off idle torque of a moped and needs to be well up in the RPM range to make power.

Under average (unloaded) driving conditions above about 2000 is usually adequate however on hills or towing a 4000 pound trailer you are going to have to spin it faster to get up in the power band.

For the most part you shouldn't use 5th & 6th gear when towing anything substantial.
Don't worry, this engine is designed to rev so running it at 3000 - 3500 in 4th gear isn't going to hurt it.

 

The springs in the clutch

 

Oh come on! Mopeds make way more off-idle torque than this engine!