Whistle on deceleration and idle.

[Stmguy42]

I have a annoying whistle on deceleration and idle. Mods on the car are: Punishment racing full intercooler kit, 1g bov and injen intake. My guess is two possible issues. Throttle body seals or 1g bov.. Any input would be great. I have owned a evo for 10 years prior to this car so im not used to the typical dsm issues..

 

[1MeanTSI]

Is it a really prominent whistle like a turbo whistle on a piped diesel at idle or is it more faint? I would think the BOV could deffinitely cause that. I've also heard some pretty cool noises come from leaky TB's too. Maybe run a blt to see if you can narrow it down that way.

 

[Stmguy42]

its like a stove pipe whistle. or whistle like herbert (the old man from family guy) its annoying.. im going to do a boost leak cheak when i get the car back from the body shop (currently doing a 95 talon-99 eclipse conversion on it, so my rear bumper support is getting welded)

 

[jrohner]

Probably the BOV

 

[Stmguy42]

What do I have to do to the bov to fix it?

 

[blktalon3]

Are you venting? If you are its probably the BOV. Mine did the same thing.

IDK if crushing would fix it or not. The bov is slightly open ay idle is the problem.

 

[Blue Talon Boy]

The 1g bov is a rare case to leak unless you are pushing more than 20psi from a stock turbo. In that case you can just "crush" it to raise its holding potential. Sorry I can't link to it, I'm on my phone. BLT would be a good idea to narrow down where it may be coming from. On decel and idle though, you would be under vacuum. Are you getting a weird idle to go with it? That would indicate a vacuum leak somewhere. Check out your vacuum lines.

 

[Stmguy42]

Im going to do a full blt when the car is home again.

 

[blktalon3]

If the bov is leaking at decel or idle your under vacuum, so a boost leak test wouldnt tell you anything.

 

[Bouche Dag]

Attach a pipe or something to the end of the BOV and vent it towards the ground. That'll at least make the noise less audible.

 

[RacintheReaper]

Sounds like Bov I had same issue with a crushed 1g but it was at the end of its days . Try a pressure tester as stated above if Bov is leaking off that alone should produce the sound.

 

[Stmguy42]

I am thinking its a vacuum leak.. But this car needs a boost leak test as well ..

If the bov is leaking at decel or idle your under vacuum, so a boost leak test wouldnt tell you anything.

 

[fparedes07070]

Hey bro my car a similar annoying whistle that I traced to the rear speakers. call me crazy, but it was sure coming from there. Just thought I'd throw that out there. The whistle would get louder as rpms went up.....

 

[Stmguy42]

Thank you for the heads up.

 

[96ETT]

I had the same whistle with same setup as you in my old fwd. Now I have a mostly stock awd with a 1g bog and the noise came back! I think its a 1g bov thing.