Unknown Power Loss

I hear a similar sound from the engine but seems to drive fine so I make the radio louder.

 

Starting at 34000mi? I was wandering if maybe some got “broke in” in the exhaust. Seemed like it to me when I first noticed it

 

That’s the rpm when the

The ACIS/TVIS System
Acoustic Control Induction System

Kicks in.its normal.

edit to add that if it is a loud whistle I would get get the intake system checked out. It may not be functiininnproperly.

 

I don't even think i've ever revved my truck engine that high.

 

I bet it's the A/C

 

Even though it wasnt turned on?

 

@JaCado
My commute has the most hilly terrain and about a 3/4 mi steep climb. I tried 4th but the truck seemed to override and go to 3rd.

The truck is really stuggling on the hills now. I can feel the loss of power and see my rpms drop where it has never did this before.

The whistle is almost like a harmonic high pitch sound and while climbing a steep hill will manifest at around 3500 rpm, fade while letting off gas, then even return at 2500rpm. It will fad after letting off gas.

But once i have got back to fairly level ground, the harmonic whistle will not want to return.

I average 21mpg on my daily commute. It read 14.9mpg this morning.

Im really frustrated and scratching my head.

High pressure fuel pump?

 

Most likely the cause

 

whistle? what is this an obs 7.3 with a wicked wheel? lol

 

After I run this tank through, Im going to get gas from another location and maybe add some injector cleaner.

...just incase it was bad gas

 

its normal for hot looking babes to whistle at a 3rd GEN Tacoma

 

Thats true Bill. I just wish thats all this was

 

That's about the point these trucks wake up, 2nd gear at 3500 it takes off.

 

Update

The truck seemed to improve alittle even before I ran that tank through.

Added a bottle of chevron fuel treatment/injection cleaner. Filled up with 93.

Now back to 87 octane.

No whistle anymore. Doest seem like the truck struggles on the hill as much but definitely still notice a power loss on hills.

Even had my wife drive and she did mention a power loss on hills.

Not sure where to go from here...

 

Don't know how steep a hill the op is climbing or what speed going, but i've never had my truck go any higher than 3,000 rpm unloaded while maintaining a decent highway speed here on steeper hills. Its only when i had to pull my 2k lb. boat that needed more beef.

 

Really? I have never noticed that. It only applies to AT im guessing?

 

Bad gas or did they start winter blend already

 

Probably. I don't have a MT to try it on

 

You are missing out brother.

 

My truck will pull to redline at any gear. Going uphill or flat roads. That would drive me insane if it lost power at high rpms, since thats when most of the power is made.