Throttle body whistle

[star_deceiver]

So here's the skinny:Whistle type noise from the engine area. Happens in every gear at any speed where the engine is above 2000 rpm on the gas with a vacuum reading between 12 and 9 in/hg. With the hood up you can hear the TB chirp when you pulse the gas to said vacuum levels. It started doing this right after I had the brake line recall done but is only realy noticable when a window is open. Had it at the deealer twice, they say it's normal. They also said that they test drove another 1.8L Vibe and it made the same noise. I've had no loss in mileage or power, it's just really (explative)ing annoying. I've poked and listened, sprayed some water around various vacuum line connections, replaced the Vacuum gauge line with the original, ran it with the air intake hose from the filter removed, no change - still annoying!!! After scouring whistling noises on-line and asking friends I've come to the conclusion that the throttle body spacer that was added for the recall is to blame. Various forums and ads for aftermarket TB spacers and the whistling caused by uneven/sharp edges have led me to this.Before the RecallAfterNow a question to all '09-'10 1.8L Vibe/trix/XD/Corolla owners who have had or havn't had the Brake line recall: Does your car whistle??? Next time your out driving; turn off the stereo, tell the wife and kids to hush, open the drivers and passenger front windows and drive around light to light - your normal routine. When you push the gas 1/4 to 1/2 ish while above 2000 rpm on acceleration can you get the car to whistle???Looks like I have something to do this weekend!!!

[dayday]

I've noticed a little whistle/chirp out of my 2.4L after installing the Typhoon intake. It happens just at the point where the throttle opens or closes.

[vibenvy]

Quote, originally posted by dayday »I've noticed a little whistle/chirp out of my 2.4L ever side installing the Typhoon intake. It happens just at the point where the throttle opens or closes.Same here. It appears to be normal with the installation of the Typhoon intake on the '09-'10 2.4L. It always makes me laugh because it almost sounds like a blow off valve type noise or something .

[Whelan]

First clean under the hood and you can more easily identify any problems. With that kinda crud coverage it'd be hard to discern a leak.

[star_deceiver]

The 2nd pic was taken in February... it's much cleaner now!

[star_deceiver]

Work in progress... Interesting design with the gasket... thinking about filing off that steel grate but not before I get another one to replace it (It's there for a reason, no sense in screwing with it yet). The steel is integrated into the top half of the gasket, making it only semi flexible.But with the TB off I can finally access the unused vacuum port buried on the botttom of the manifold!Note: The throttle plate gears under the rivoted plastic cover are squeaking....

[Silversn95]

This is one reason I haven't bothered with the brake hose recall on my Vibe. This is what I think might be happening: 1. The added spacer behind the throttle body may not be sealing correctly or may have a step into or out of the airflow (since the induction system was never designed to have that spacer in the first place).2. The additional zip tube length (this is the length of air passage between the plenum and throttle body blade) might cause a change in the air flow such that an induction whistle might be generated either at any of the secondary air inlets (brake booster entry - which has been repositioned by the spacer, PCV, purge and whatever else might be on the intake - I haven't really looked at it yet to be honest), or, the change in length between the back of the throttle body blade to the steel mesh of the gasket makes them ineffective. That steel mesh is a method to reduce induction noise common with composite intakes. The mesh is there to break-up the high speed flow off the end of the blade to prevent an induction whoosh and whistle as the blade is opened. It might be the combination of both items causing the whistle as well. I can see from the picture that the spacer has fairly large clearance holes for the throttle body bolts. This means that the relative position of the ID of the spacer to the throttle body bore and intake bore can easily have a significant step. I would start by first trying to re-assemble the throttle body and spacer trying to line-up the ID's as much as possible.

[star_deceiver]

Quote, originally posted by Silversn95 » I can see from the picture that the spacer has fairly large clearance holes for the throttle body bolts. This means that the relative position of the ID of the spacer to the throttle body bore and intake bore can easily have a significant step. I would start by first trying to re-assemble the throttle body and spacer trying to line-up the ID's as much as possible. It's sealed, there's no vacuum leak.I aligned it the best I could, sound changed slightly. I'm going to hunt down another mesh and maybe even a TB if I can find one cheap enough at the wreckers, take it apart and see how the DBW works. But colder weather's coming and with the windows rolled up the noise is barely noticeable....

[09vGT]

I was just going to start a thread on this whistling.. lol.. Just curious what it was..

[Atrixz]

You know what...now that you brought it up, my whistle also started occurring after I brought it in for the recall. I had no idea they added a throttle body spacer. Didn't mention anything about it nor have any type of paperwork stating it was installed. But keep us updated on any new findings/solutions. The whistle is fine at times, but also annoying at other times.Also on the other hand, why did they add this throttle body spacer? Was it even necessary?

[star_deceiver]

The spacer was added for the rerouted vacuum line for the brakes... I can't remember offhand where it was routed before.