Does it increase with the RPM's. Sounds like a belt or something in the pulley assembly. Old timer trick is to hit the belt with a puff of baby powder......but that's more for a squeaky belt.

 

Take that video again with the hood up. Include the actual start. Attempt to focus on the noise area.

 

It is easy to check the idlers for the drive belt by releasing the tension and pulling the belt off and away from the crank pulley. Then restart cold to eliminate belt idlers or accessories. That sounds a bit different than a squeaky idler though. Have you checked trans. and power steering fluid levels?

 

I'm not positive that it increases with RPM. I'll need to check to be sure. If I have to guess what it is, I'm going to say it's the electric air pump. I'm trying to get a video of the sound it makes when I turn the key OFF too. I know it sounds like a quick vacuum noise normally, but in my mind I could put the other sound it makes and the noise in the video as the same component.

UPDATE: Here is the air pump noise.... it sounds a whole lot more normal in the clip that it does in person. I'm assuming that this is normal from what I'm hearing. In person it sounds more like plastic gears grinding.

http://s154.photobucket.com/user/hotrod53/media/IMG_0731_zps554d3a2f.mp4.html

 

HotRod53, I've listened to your cold start noise several times and something is bugging me about it that I can't quite put my finger on. The noise is definitely not normal.

This is probably a very long shot but I heard a noise like that coming from an A/C compressor one time that was self-destructing. It too went quiet when the thing warmed up. Are you cold starting your truck with the temp. control set on the A/C mode or the bi-level mode where the A/C compressor is engaged? On the other hand I might just dismiss the possibility of a bad compressor on a new truck.

Just for fun I took an air pump apart one time to see what was inside. As I remember there was a simple foam air filter and just a plastic vane pump. Not sure it could make that type of noise.

Power steering pumps also like to make strange noises until warm especially if low on fluid or air is present..

IDK, at other times it sounds like a belt is rubbing or there is a rough idler bearing.

 

Taco'09, this noise is on a cold start without the defroster running. I think I can eliminate the AC compressor based on that. I'm guessing a rough idler bearing as you said, or maybe the electric air pump.

I have to take it into the dealer, just haven't had time yet. I'll surely update when I do.

I appreciate your input!

 

UPDATE: I stopped in to see my Toyota Service Manager today and played the video for him. He pulled one of the techs in to hear it and he thought as I did, maybe a tensioner or idler. He wants me to bring it in and leave it when the weather gets down into the 20's. Neither had seen a Tacoma that does this nor was there any TSB that was related.

 

Another UPDATE: I realized today that it does in fact change with RPMs. I took it to the dealer last week and played the video, I'm dropping off the truck on Monday night.

Today it was in the 20's, I started the truck and it didn't do it. While I scraped off my windows, it started to do it and then stopped again, and NO, the defrosters were not ON. It really sounded like an idler this time.

 

ADDITIONAL UPDATE: my truck has been to the dealer for 2 days and it's cold out, wouldn't you know that it hasn't made the noise yet even though it did it the day I dropped it off!

My dealer has taken my audio/video that I sent him and forwarded it to the factory. They said that once they figure it out, it may be released as a TSB.

Looks like my truck will be there another day or so. No matter, they gave me a 2014 Corolla to drive while I wait.

 

^^^ I hate phantom problems with vehicles. Its as though they know to quit misbehaving when taken in for repair, and everyone has experienced this.:dunno:

 

We think the problem is found! The Dealer said that they got noise from pulley #2, bad bearing. Time will tell, it's a drive an listen mission now.

Hopefully fixed, just in time for the next problem..... my '06 XLE V6 broke a front spring today!

 

Hotrod53, is pulley no.2 the one with the metal shields they use to sort of keep gunk out?

 

I'm not sure which is #2 but I'll look this afternoon and see if I can tell which one was changed. It may be hard to tell being that I'm only at 4500 miles.

 

Its hard to distinguish between brand new and almost new, but it appears that the one that was replaced was the one on the passenger side next to what may be the steering pump. There are two, one above the other, on the drivers side, they appear to be original.

 

Glad you got it figured out! My 08 makes a very similar noise. It has done it off and on for years, especially when it is cold out. I will be replacing all idlers when I replace the serpentine belt.

 

Well fellas.... the Taco is back in the shop again! The hopes that it was repaired were squelched this week when the temperature dropped. I suggested that they change the rest of the idlers, we'll see what happens.

 

Bad news today .... potentially REALLY bad news!

My dealer is working with the Toyota Factory, they have zeroed in on the noise and todays thought is that it is a main bearing in the motor! They feel that the noise is radiating out and therefore was thought to have been an idler.

I should know more on Monday, but for now I'm driving a 2014 Corolla.... not a Tacoma, but it will due for now. Of course we're expecting big snow this weekend and I'll have no 4x4... just my luck!

I sure hope that this is wrong I only have 4500 miles on the thing and really hate for them to pull out my motor! At that point, I really don't want it rebuilt, I'd rather see it short blocked and I'd want some additional warranty since Toyota only offers 60K.

Depending on the results, I may close this thread and start a new one so people can find the bearing issue in the title, if that is in fact what it turns out to be.

This is one of those times where I'm glad that I already bought 3 Toyotas from this dealer and the Service Manager has always been great to work with.

:OMG:

 

Yeah, that sucks. I agree on the new thread idea if that ends up being the result, or we can modify the title of this one. Either one is fine.

 

Wow, keep us posted on that. I'll have to listen to your audio recordings tonight, since I also have a '13.

 

Bummer HotRod53. Let's hope for the best.

Not saying this is the same thing as yours but this guy initially thought he had a bad pulley too and ended up with a trashed engine. Have you seen this thread? http://www.tacomaworld.com/forum/2nd-gen-tacomas/73107-sounds-like-bad-pulley-wish.html#post1384704

 

Dude take it to the dealer.... Let it sit outside for an hour or 2 and let them start it


Sent from AutoGuide.com Free App

 

The dealer has it and they are the ones working on it, it's been there since last Tuesday. The Toyota factory is assisting in diagnosing the problem.

Just my luck... snowing like crazy out and I almost couldn't make it home yesterday. More snow on the way again today, sure would be a good time to have a 4x4! This Corolla that they gave me as a loaner sucks in the snow!

 

Well.... it's like a bad dream. Toyota has authorized pulling the front of the motor apart, if pieces are found, the pan comes off next. As far as I know, the motor is still in the truck at this point.

The factory rep is going to the dealership personally to see the motor for himself. If it turns out the way that they think, rebuild will not be an option, but motor replacement. Apparently Toyota is big into "root cause analysis"... which is good as far as I'm concerned.

No complaints about the dealership though, it's just one of those things and it's all going to plan so far...... as I would have expected.

Taco'09 ... I had not seen that, THANKS! I forwarded that to my Service Manager. He knows that I frequent Tacoma sites and the last time I was there he asked my what I found on the web about it ... LOL.

 

in your original post you said that the noise seems to go away when the engine warms up. is this true? if the noise goes away it could be piston slap and is common in some engines, but completely unacceptable for a new vehicle IMO.

 

Yes it does quit when its warm, here's an update since yesterday:

UPDATE: got my truck back yesterday.. new oil pump, new front engine cover, new timing chain idler gear and bearing, new chain sliders, new chain tensioners... 12 hours later the noise is a bit less but never the less still there.

It was 17 degrees when this was heard today, usually it starts around 20 degrees. I fully expect it to be worse when it warms up outside.

It's looking like new engine time. I was told that if this didn't fix it, that was most likely the next step.