Well after bringing up my forum (https://www.cobaltss.net/forums/2-0l-lnf-performance-tech-153/whats-causing-my-car-flutter-216926/) about the fluttering issue with 5800 miles now, it came back bitting me in the ass in a bad way. My car is starting to **** me off with the bpv going bad. I was leaving my street merging onto incoming traffic. I hit the gas in first gear and felt something awkward, then hit 2nd gear my car wasn't boosting as fast in 2nd gear as I expected and saw my boost gauge hitting 5psi only, instead of 20psi normally. So I let off the gas and the flutter noise occurred and kept doing it to me the next couple of minutes. After 20 minutes, it went back to normal and never occur again. I was hitting my boosts level normally at 20-22psi. Now I'm going to the dealer to get it check out. Why is this happening to me?

 

i dont know why u get so upset dude, u got GMS1. who cares, u payed huge money to be able to bring your car to the dealer and not worry about fixing ****. All i have to say to this is "Go to the dealer, its freakin free"

I hear the GMS1 tune sucks, maybe u just need to get rid of it.

 

Dude...! Its the bypass valve acting up, not the tune. I had that tune for awhile and never experienced any issues since for a period of time. It sounds like that guys video I posted in the last forum http://www.youtube.com/watch?v=c97hKkihKl4, except I'm driving with 5psi instead of 20-22psi while the fluttering is occurring. I either got a leak in the damn thing, or something teared up, or the spring is weak. Sorry for being ugly man.

 

soooo remove your bypass valve and see if its leaking. but it seems to have fixed itself so my solution is "**** it, it works"

 

I agree with the other guy. Take it in and let the dealer worry about it. That's what warranty is for.

 

yeah, you know Jeff Gordon is going to say about removing the bypass valve, "you should have not done that son." My sh*t was acting up when I was driving to drop off some job applications. My car didn't want to boost at all. I was only pushing 5psi when I wanted to push 20psi to leave traffic behind in full throttle, the flutter occurred at the same time loudly. It did it to me only 2 times yesterday leaving the drive way in 2nd gear, then went away. As soon as I get a job, doing the alternative to mount a external bov onto the injen intake and get it welded and disable the bpv.

 

Earl i dont know what you want to hear man. your saying what, you dont want to bring it to the dealer but you dont want to check it to see what the problem is. So what are you posting for? just to complain about the problem? Bring it to the dealer and tell them the problem. Let them **** with it. If you remove the stock BPV and its torn or leaking, what are you gonna do? replace the leaking BPV and bring it to the dealer right? so might as well just go to the dealer in the 1st place. Let them looka t it, if they give it back and say I dunno, then your free to **** with it yourself

 

dude use the **** outta ur warranty or sell ur car. theres really no other way to say it. good luck with the car tho

 

Well I'm going to the dealer tomorrow in the morning. Its been scheduled since the problem occurred and getting the rotors checked.

 

I have the exact same problem. I have GMStg1/MPx catless DP/kn drop in air filter. Same thing happened to me today, flutter, 5 psi max, weird sounds. I parked it for 20 minutes came back and it was fine hitting 22-23 psi. Washed my car tonight, started it up and it was doing it again. So it's pretty common knowledge that this problem is because of the BPV?
I am very close to selling this car. with only 11K miles.

 

you described it better than me. you have the same exact case as me. I don't know much about selling cars to get rid of a loan and not have to take the hit on negative equity.

 

I will let my brother take a look at it (he's a mechanic). If he can't figure it out (which I highly doubt) then I will put my stock DP on and take it to the dealer and make them fix it. If this is another problem (Oh idk, the 6th problem with my ******* '09 SS/TC) then I will spend the next month getting this thing in perfect condition and then sell it.

I assume when you say BPV you mean bypass valve"? Or do you mean blow off valve?

 

some people say stock blow off valve and others say bypass valve, but both are the same thing.

 

Ah, well make sure you update this thread and let me know what the dealer found out. I'll update this thread and let you know what my brother finds, if anything.

 

well do...! glad someone said it better than me. I attend to exaggerate and not make any sense. If my car keeps it up in the longterm, goodbye I say. Take out the aftermarket parts and sell it, bring it to normal condition and get myself a reliable vehicle like the 370z or a V8 if I ever get in the car sales, which I'm applying for.

 

Exactly.... I have been having this issue mow for the last 3+ months.... Dealer doesn't know what's wring with it....car flutters all the time in first gear, doesn't pull hard at all, but still boosts 20-21 psi..... I had the same thing happen to me when I was pulling out in traffic and would only hit 5psi and no power..... Keep us posted as there are a tone of us with this issue

 

so this sorta problem was happening to my friend awhile ago. It was his intake and water. Was with the Hahn intake as well. I'd say put the filter on the pipe further. I've yet to have any issues with mine. I got a tune for 22-24 psi and the hahn intake with no problems

 

If it has to do with that, then I'm ripping off the intake and selling it, but it doesn't make sense. It should have occurred early, since i had the intake the first 1000 miles with no fluttering.

 

seriously try putting the filter on further and tighten it. his doesnt loose boost anymore.

 

It happened to a guy with the stock airbox with only the drop in filter.

 

woah woah woah you got the injen CP??? do you have the diff connectors?

 

yes, I have the Injen CP. With regular clamps connected to the turbo to the lower piece, expect the Intercooler has T-bolt's all over it. what connectors? I never had any flutter activity issues with the Injen CP. I had the CP first before I added the Hahn Intake after 2 weeks waiting on TTR to ship it off the intake. My car was responding effectively with the CP on compare to the stock one. Well, I do have my stock parts chilling in my trunk.

 

Yeah..... Mine flutters bad in first gear.... I have the stock airbox with k&n drop in.... I even put the stock filter in and it still happened..... I know the intake isn't the issue..... It's to do with the gm stage 1 kit because everyone who is having this issue has the kit!

 

Yes, all I have is GM Stage 1, a catless MPx downpipe, and a K&N drop in filter with stock air box (no airbox mod, nothing). Just those three modifications. I am dead positive it's not because of the intake. I am also dead positive it's not because of the downpipe. It's either because of the Stage 1 kit or the faulty stock BPV.

 

my buddy had the mid section of his injen disconnect as well, cause problem is if the tubes arent aligned it messes up. I've yet to have any problems nor boost to 5 psi. which is kinda weird that urs does it but i dont have the injen CP