VZZZZTT sound 15 feet after start up

I have an '06 ACLB, TRD OR 4.0 auto 4wd. Every time after I start it and drive forward, it makes a VZZZZTT sound after I've driven about 15 feet. It doesn't matter if it's hot or cold, or if I back up first, or just drive forward, let it idle for awhile or just start it and take off. It doesn't correspond with letting off the brake pedal. That's the only time it does it. 1 time, then never again til the next time I start it. What the heck is it?

 

Does it come from under the hood? I get something like that, but I don't have to move.

 

I feel like mine has done something like that but I just don't pay attention to it. Always assumed it was some pump somewhere just doing its thing.

 

It does sound like some kind of pump or actuater. It must be normal, but I'm curious what the heck it is.

 

Part of your emissions system. Normal.

 

I was going to say the same, but has an '06 that doesn't have that pump in the engine bay.

 

I looked this up after getting into my "new to me" 06 DCSB 4.0 TRD OR. It is some type of safety check.

https://www.tacomaworld.com/threads/noise-after-shifting-into-drive.273/ Post #12 and #13.

 

Secondary air injection system. Sounds kinda like a turbo spooling up. Happens on shutdown too.

 

I think my noise might be different, as I don't have the emissions pump or an automatic.

I think my noise could be the radiator fan.

 

Not on an 06. Likely an abs self check

 

Yup, I got a little quick on the draw.

 

WooooHoooo!!!! That's it. Thanks.

 

OP.

Does your truck have the optional VSC package? If so its likely the master cylinder building pressure.

 

Happens to the best of us.

 

Nope, no VSC.

 

ah then its not that, but probably the ABS self check like others have stated

 

ABS check would make sense. I haven't heard the noise in a while because I pulled the ABS fuse. (ABS too sensitive)

 

You can get the ABS self-check to happen while backing up, too, if you go fast enough.

 

I'll have to try that.

 

Normal. Like others have said, ABS related. My '11 and '13 both do it.