High Pitched Revs on Startup

Hi guys,

Apologies for creating so many posts the past few days, and sorry if this has been asked before. I searched but could not find anything.

I've had my truck (5.7, non-FFV) for about 3 weeks now. This morning I started it up and drove to work. I go down a large hill for the first part of the drive so I tend to downshift into S2. This morning I heard this loud, high pitched revving from the engine which I have never heard before. I'd say I was up around 1500rpm. It sounded like my old Subaru pulling up a climb. It went away as the engine warmed up, and by the time I got to work it was gone, even when downshifting. I didn't hear it when accelerating on the flats, but by that time the engine had warmed up a bit.

Is that totally normal? I don't have a CEL or anything, but it surprised me since I haven't heard the engine sound that high pitched before. I'm used to the deep rumble, even when cold. Probably just over-analyzing but I want to be sure.

Thanks!

 

You answered your own question, seems to me that it was because it wasn't fully warmed up, our engines rev a little higher when cold, mine surely does. I say it's normal.

Also like the way it roars when you haven't drove it in a while.

 

Thanks for that. The only thing that is a bit disconcerting is that I haven't heard it that high pitched before and I've made the drive a dozen times or so. This was arguably the warmest morning we have had as well. It almost sounded like I stacked my Subaru engine on top of my Tundra and both were revving. I'm probably just an overly protective new truck owner, but you can't fault me for that! I'll keep an ear out.

The bonus to all my posts is that I'll be able to sell my pro shift knob soon! Gotta pump those post numbers up, mine are rookie numbers.

 

Yea definitely keep an ear out, do you listen to the radio/music? Was it off that day that made you notice it more? But yea it's good to be receptive to your truck.

 

Music was the same as it always is. I'm 90% sure it's new. I'll try leaving it in drive, letting the engine warm up etc. It only has 1500 miles on it so I can't say I'm used to what it should sound like.

 

You have an SSTS??

(Secret Squirrel Turbo System)

 

Here's a question, do any of you guys manually downshift when slowing/stopping? I keep reading about warped brake rotors, but maybe my downshifting habit isn't necessary at all and could be putting undo stress on the transmission.

 

You don't need to downshift manually. It downshifts just fine all by itself. In fact, it downshifts and provides more engine braking than any automatic I've ever owned (and I've had a lot of 'em). I believe this to be intentional on Toyota's part, and accomplished by their AI (artificial intelligence) transmission control, which has been designed to anticipate the driver's intentions.

You can of course use the xmsn manual downshift feature to facilitate engine braking on steep hills when you feel it's needed. Otherwise, I'd leave it alone.

 

I usually let the truck run for a full minute or so. I usually drive after the loud fan stop. But on a colder morning, I let the car run for a while. And the truck will down shift if you let go the gas while going down hill.

 

I started noticing the noise on acceleration yesterday. I don't know if I'm hypersensitive now and it's always been there. Can't imagine it has, it sound like there's a separate engine driving quickly in reverse on top of my normal engine sound. I've also noticed that when I let off the gas I hear a slight hiss from the vents for maybe a second. Still no CEL. I'm taking it in to the dealer next week. Any other thoughts on what it could be? I haven't noticed a drop in power or any ticking, just this new rev sound.