I had the same problem recently, including the LOUD backfires that it had never done before, here is my story...

https://www.cobaltss.net/forums/general-cobalt-68/09-ss-tc-new-engine-%40-24-xxx-miles-219564/

 

Im having horrible problems with my car, refer to other threads posted on for details. Dont feel like retyping lol. Anyways the dealer replace the boost sensor once and they claim its the problem again. this is the third time for the problem. I told them i either want the car fixed or lemoned so frustrated with it. My car got so bad sunday that it buck viloent when driving in third gear about 35 mph so i turn right around and went home and had tow truck pick it up and take it to the dealer. The problem only gets worst believe me lol.

 

I don't think I have the same issue as you because I'm not missing any coolant.

 

I only started to lose coolant about 3-4 days before they replaced the engine, up until then I still had all the stock fluids

 

Hmmm.... Where was the hole in the block at.....now I'm worried. Then again, I never had this issue until they put the kit in, the car worked perfect before.

 

Noone really indicated, and I was so taken back that they were giving me a new motor, I didn't ask any of the questions I should have. When I get the car back which was supposed to be yesterday, and now they've told me friday, I will make sure to ask all the questions I can, and hopefully be able to give some more information. It couldnt have been too obvious though, because they didn't find it until the second time I came in for the loss of coolant, and they had already put some dye in there so they could pinpoint it.

 

Had it for 6 months and one day I was boosting only to 5psi so I parked, went to work. Came out to my balt after work and popped hood and randomly decided to push my MAF sensor in (thinking it might be loose) started car and punched second gear and boost was back. Did I fix it or did it just come back..... Chevy checked codes, and nothing. They had nothing say but a simple shoulder shrug

 

I just replaced my plugs and they look like they were firing thru the porcelean.

 

This could be your problem..your first post on getting the GM1:

I just had stage 1 installed on my ss/tc and the tech didn't even test drive it which part of my was happy nobody did any spirited driving in my car. But on the other hand i was a little worried if it was correctly installed. So far so good.

https://www.cobaltss.net/forums/show...14&postcount=8

I think shoddy installs combined with a kit that has invites shitty installation is the root of many problems. The sensors don't mount as they should and wiring/splicing can be dicy. That was one of my main concerns when I downloaded the instructions prior to receiving the kit. I lucked out discovering a tune already installed on my car and sold the kit. Not knocking the kit...but I was not looking forward to having it installed. I don't think GM really did their homework designing the kit and /or educating techs how to install it . Call any GM service dealer and he'll say >>>> when you ask him about this kit! They don't know JACK shi**T.

 

This "flutter" you guys are talking about? Is ithat the sound you get when after accelerating hard and then lifting your foot off the throttle quickly you hear a fluttering noise for a split second? THAT'S normal. Your turbo is producing more boost now with the upgrade. Under full, or just heavy, throttle the boost is coming out of the turbo, through the IC and associated plumbing through the throttle body and on into the engine. This is all happening at BOOST. Under PRESSURE. When you slide your foot off the throttle the throttle body butterfly slams shut, and leaves that residual BOOST PRESSURE with no place to go so it just exits the loop via the bypass circuit into the exhaust to equalize the pressures in the loop. There's your flutter. It gets MUCH more pronounced with the mods in my sig. Old ladies on the side of the road jump and the gators run for the canals.

 

i got trifecta, boosting 22psi and i dont have any flutter at all. even at 24psi i didnt have any flutter.
I think most of these wire problems would have been solves if gm would have made all the wires a diff color. why all white? thats just dumb.

 

I pull 20 solid and spike at times to 22ish. Never hear *flutter*.

 

I promise most people have some form of flutter they just aren't hearing it ...

 

I have had no problems with the GMS1. With all of my mods I pull 22 solid and can easily get 24. After punching it and letting go quickly I'll hear some flutter but as its been said, completely normal.

 

whats not normal is only boosting 5 psi... lets assume for a second flutter is indeed normal and put it outta our minds... however like i stated b4 only boosting up to 5 psi is an indisputable issue. and the fact that some cars don't flutter what-so-ever tells me that's probably an issue as well...

 

do you have an oiled filter? I had the same issue with my car would flutter badly due to the MAF sensor being dirty with fuel trims off, but it would be a good place to look. the other problem related was I had a boost leaks with both my CP and Intake, but that was later fixed, and never occured again. Those are two places I would look at. My sensors on my GMS1 has been good to me and my stuff was professional installed without a hitch.

 

I'm having no issues at all with my GMS1 just trying to bump the thread back on course... people with trifecta and what not saying they don't have issues isn't helping this thread move along is all i was trying to say in politer terms

 

NEWSFLASH: Just happend to me today in a 2 day period 3 times, but it kicked into LIMP mode and never backfired or misfire. So I'm just gonna restore my car back to factory and give up on this damn thing. This car isn't worth the hassle to modify, get rid of all my mods and keep my GMS1.

 

not cool .... sorry to hear that... if my car starts i'll probably do the same thing however i only have GMS1 and a K&N intake so its not like its hard to go back to stock ... I wonder what K&N will do for us folks with just their intake... their warranty says if the dealer claims the intake as the cause they will go to bat for you ... food for thought i guess...

 

I already sold the Hahn intake to someone. Getting rid of TWM, ZZP (I might keep), and Injen CP. Gotta order some stock parts like charge pipe and STS parts. Fix my front bumper and right rear rim. so no offense to anyone who has done mods, but this fast and furious bullshit is for the birds on these cars.

 

I don't have GM1..tune only. I'm new to all this, but there definitely seem to be more *problems* with those having intake, charge pipes,DP mods with GM. I don't know if that's in combination or what. Seems that having a tune (as opposed to GM) with these aready on is the way to go for sure..but even then, some may have problems. Personally I don't need the extra HP obtained with them.

Bone stock (with HTP tune) and driving a VERY fast car

 

Almost 19k miles on my 09 SS/TC, last 2k with GMS1, no issues. Had it on all summer long

 

Wow, I keep hearing back n forth on these cars having problems with GMS1, then Trifecta, and even stock.... damnit I need to make a year of payments or two then sell it apparently

 

Modifying almost any car can present problems, its kind of the give and take with modding.

If you think i slapped a cam/heads/intake/built trans/rear and full suspension without some quirks then you are mistaken.

Changing headers on cars can cause all kinds of weird issues. CEL's, burnt wires etc, just kind of the nature of the beast.

 

I bet I got a leak in the Injen CP which might be causing the LIMP mode, not the first time its happend, but not sure yet. It went LIMP mode today, but never backfired or misfire like the last 2 times.

well I guess I was right, found a rip on my coupler at the turbo inlet, which I'll post a pic soon. Lucky I still got my 2" injen coupler.