When I take my foot of the gas at lower rmp's it will make a fluttering noise and jerk the car a little. I first noticed it after I got an upgraded intercooler put on. Is this okay or do I need to do something about it? It does get Anoying....

 

try loosening it up as just read on a similar situation.

 

Loosen what up? The bov it self?

 

Who installed the intercooler? My primary intuition says that they reinstalled the diverter valve incorrectly which is a common mistake.

 

Mine does this sometimes also only at low low rpms

 

Loosening what up? Can you elaborate?

Carlos

 

mine does that too. it is quite annoying. i have a stock fmic though, so im guessing it must be on the wrong way?

 

here seems to be a similar situation and your answer

https://www.evolutionm.net/forums/ev...s-already.html

 

+1

Check the DV. The bottom port should be on the UICP.

 

The dv is fine and was never touched during the install. Any other possibilities?

 

this is the correct orientation right?

 

^ yes

 

Maybe run a new 1/4" vacuum line from the bov to the intake manifold, bypassing the small 5/16 oem line. Just something to try.

 

They are going to flutter a little, I kinda like it, but if you are trying to hold boost and they do it sucks, You can always get an aftermarket one, but really the Stock BOV, is great. I have had about 6 Bov's, stock one has about 11,000 miles, Greddy Type S Great sounds great mostly more flutter, HKS works great, sounds good, FRL, little crazy, does not hold well at boost, just had it for the sounds and weekend entertainment, I cant remember some of the others, but right now I use the Tial Q and I will not and can not complain at all about it. I love this BOV, and wish I would have got one right off the bat. Sounds good, holds boost, works great for light throttle, full throttle, no flutter at highway going up hills. never a problem at all. I am the happiest with this BOV and I will say it, THAT TIAL BOV IS THE BEST

 

Also I heard upgrading the intake pipe can make them flutter a little more.