Hey guys I'd figure I would finally try and figure out what's wrong with my cobalt.....when I accelerate I get like a grumble(makes my car sound like junk) cant even hear my supercharger whine over the grumble....any help would be great

 

exhaust leak?? where does it sound like it's coming from?

 

Honestly have no idea couple people have told me exhaust manifold gasket...do these tend to go? My Balt has 39000 miles

 

What year is your Cobalt, caileighpaige?
Sarah
GM Customer Service

 

Start with the flex pipe. A LOT of people find that there's a hole in it. It could be a gasket, but like I said, I'd check the flex pipe first. That's the most common exhaust leak source.

 

2006 ss/sc

 

Mine has been making a hissing sound when I accelerate and it's incredibly annoying. Sounds like a vacuum leak almost. It's not the exhaust, either.

 

Because lsj

 

I can look to see if there are any open recalls or anything associated to your car if you wanted to get me the last 8 digits of your VIN in a PM.

Sarah
GM Customer Service

 

holy low miles batman--

-- anyways-- i would go with what Alley said- sounds like flexpipe which is exactly what is wrong with my 06 atm. ZZP=win just sayin

 

Its not the flex, its coming from inside the engine bay. My 06 ss/sc has aways made that sound its on the low rpms and has something to do with the engine itself. Mine did it since day 1 wit 0.2 miles on it and i went through everything looking for the same issue. 6 yrs later and in the low rpms it still makes that sound and i jus broke 30k

 

Noooo it didn't make this noise until about a month ago I'll check flex pipe

 

hahaha WTF kindof a noise description is its like a grumble? haha. ive never heard anybody describe a noise comming from a car as a rumble, except maybe someones new exhaust and they LIKE the rumble its making

 

If you don't figure it out you're more than welcome to come to the mod day and I can take a crack at it.

 

if anything its the manifold gasket leaking then as it gets hotter it expands and seals

 

if anything its the exhaust manifold gasket

 

yeah that would be awesome....whens this? and whats a mod day haha



ok finnnnnne how about it makes my cobalt sound like a falling apart piece of **** civic?

 

dude it has to be a leak i sealed mine about 3 weeks ago and it just went bad last week, they told me that i have to replace the exhaust manifold.its an annoying noise i think the best is just getting a new manifold cuz im pretty sure the noise will come back again

 

Does it sound like this at idle?

Hissing - YouTube

 

I had a similar noise. At idle it was fine but with any throttle input, especially under boost it would sound like static coming from the P/S door speaker. I found it hard to check the flex, it seemed fine at idle and under load when trying to hear and feel for leaks. I replaced the down pipe anyways and it solved the problem. Get yourself a pipe from zzp, price is cheap and awesome quality.

 

i get that grumble noise when accelerating or running anthing under 2200 rpms...like if i shift to early into 5th or sumitn or in 2nd going really slow, when the rpm's are under 2200, engine makes a grumblin noise, dident notice it until around 30k or so..idk, never really noticed it. i have a 07, 105k on it now. still makin the same noise.

 

I have the zzp long tube header and downpipe combo. Still makes that noise. I initially thought it was my timing chain slapping around but that got replaced under warranty a month ago. And the noise was still there afterwards. I just got used to it.