Does anyone have experience with this engine "whistle" sound?

Talk2meg00se wrote

"gunk accumulates around the idle air valve so that it doesn't close 100% therefore causing a whistling sound"

this valve closes under acceleration?

That's my understanding. When the car is idling the throttle body butterflies are closed so the idle air valve needs to open so air can get into the engine for combustion. When you accelerate the idle air valve closes since the butterflies are now open.

iirc i did see an additional air hose on the idle control unit to let some amount of air pass by even when it's closed also.

So far i haven't been able to confirm anything besides the fact that the whistling goes away if i disconnect the idle air hose.

dreamspeed wrote

That's my understanding. When the car is idling the throttle body butterflies are closed so the idle air valve needs to open so air can get into the engine for combustion. When you accelerate the idle air valve closes since the butterflies are now open.

iirc i did see an additional air hose on the idle control unit to let some amount of air pass by even when it's closed also.

So far i haven't been able to confirm anything besides the fact that the whistling goes away if i disconnect the idle air hose.

"the whistling goes away if i disconnect the idle air hose."

sounds like you are very close to solving this riddle

this may be the source of my whistling as well, thought it was the ICV too

Route 16 wrote

this may be the source of my whistling as well, thought it was the ICV too

Whistling sound upon acceleration http://www.m3post.com/forums/showthread.php?t=1417824

Dreamspeed added this...

BOOF-M3 wrote

Whistling sound upon acceleration http://www.m3post.com/forums/showthread.php?t=1417824

Dreamspeed added this...

yup that's the other thread that lead it to me too, I'll try to add my videos replicating it

Sooo no one found out how to solve this damn riddle.. seems like it is not a major problem though

xjinpark wrote

Sooo no one found out how to solve this damn riddle.. seems like it is not a major problem though

I'm pretty sure we did figure it out?

I had this issue in the past and it was the Intake Plenum. There was a hairline crack in it.

jasonrp15 wrote

I had this issue in the past and it was the Intake Plenum. There was a hairline crack in it.

how did you figure that out?

Talk2meg00se wrote

how did you figure that out?

I had the techs at Active Autowerke take a look and that was the only location the sound seemed to come from during low rpms acceleration. Replaced and it was fixed!

jasonrp15 wrote

I had the techs at Active Autowerke take a look and that was the only location the sound seemed to come from during low rpms acceleration. Replaced and it was fixed!

I had a vacuum test done -- no leaks. Someone else suggested the seal between the exhaust and the engine. Not that either.

UPDATE: whistle sound **fixed**. A big thank you to Beverly Hills BMW for solving.

Part no.: 11-61-7-838-010

Talk2meg00se wrote

UPDATE: whistle sound **fixed**. A big thank you to Beverly Hills BMW for solving.

Part no.: 11-61-7-838-010

Is this the elbow?

My bmc filter used to do this, it went away with the eventuri kit and airbox lid.

Talk2meg00se wrote

UPDATE: whistle sound **fixed**. A big thank you to Beverly Hills BMW for solving.

Part no.: 11-61-7-838-010

So this part number is the entire intake plenum ?

How many miles do you have?

pocky wrote

So this part number is the entire intake plenum ?

How many miles do you have?

Google say so: https://www.ecstuning.com/b-genuine-bmw-parts/--m3-intake-manifold/11617838010/

Talk2meg00se wrote

UPDATE: whistle sound **fixed**. A big thank you to Beverly Hills BMW for solving.

Part no.: 11-61-7-838-010

Oh THANK GOD. heading over there ASAP. Happen to remember your service advisor?

Talk2meg00se wrote

UPDATE: whistle sound **fixed**. A big thank you to Beverly Hills BMW for solving.

Part no.: 11-61-7-838-010

Sorry to revive old thread but up to what mileage is this covered by federal warranty? I have the same whistle on my 97k mile 2013 M3 Coupe. I live in California. Is this an emissions thing that is covered under California warranty?