Alright.. so later this evenign i noticed while i was sitting at the lights. that my car was vibrating.. I though it was just be, my gf said she felt it to.. My rpm's don;t jump around, but it just seems to shake?/ any ideas??

I am tottaly lost.. and the car is warmed up to.. i don;t get it.. its whenver i am sitting at a stop.

 

That happened to me once when the car had like 250mi on it. Lasted about 5mins while I was stuck in traffic then went away. Haven't had it happen again since then. I'm only at 2000mi now though.

 

It does it all the time? I'd guess either something with the exhaust (a clogging cat can cause bad vibration) or engine mounts.

 

ya it happens all the time.. its weird.. its comes and goes.. goes for like 3 or 4 secs and stops and then starts back up again. when i am stoped..

 

I red awhile back that a clogged cat can cause it maybe.

 

so i guess i got to take it to the dealer and get them to check the cat then.. i got my stage 2 going on tuesday.. so I guess I will get them to look at the cat as well

 

Good luck on your stage 2! I'd definitley get them to check it out. If your car is doing it all the time, hopefully it'll show the service guys what's wrong with it.
The only other thing I've experienced that can do intermittent shaking like that is something like an a/c compressor, or anything else that could be turning itself off and on and vibrating the car.. The cat should be doing it always, and you should have noticeable problems in driving as well.. and your exhaust should smell ******* horrid. You'd notice ifyou had a clogged cat.

 

Hell mines been doing it since I got it. I just thought it was normal...almost like a cammin' effect, except rocking forward and back instead of side to side...I got 16,600 on mine...

 

could be the cams to.. I dono.. its always loud at start up.. and i dono. its the supercharger usaully loud.. almost sounds like its scraping and such.. I am just totally lost.. I got no mods excpet for an injen intake

 

If I pop the hood and listen then yeah the supercharger does sound like a lot going on inside at idle, but to be on the safe side you'll be at the dealer anyways, just get them to look at it and tell us if they find anything...

 

FYI the "rocks in a tumbler" sound coming from the supercharger is normal. Good luck getting it worked out.

 

My Fiance's LS vibrates at idle as well...RPMs dont jump, but feels like its not normal.

I dont know, but its weird.

 

my car has done it since i got it, but it doesnt happen all the time. its only every once in a while

 

my car does the exact same thing and it drives me nuts. I think it might be a motor mount acuse on the dyno one time it looked like the motor was gonna jump out of the engine bay.

 

my car just started doing this. Is there a fix?

 

Same here on my '05 ss/sc....

 

sorry to bring that old thread back but mine is doing the same thing, i did a search and found this, did anyone with this issue found what was the problem with that idle shaking,

the car is shaking because the engine shakingback to front and rock the whole car, i went to the dealer and they told me its normal, i doubt it.

anyone found what was the problem?

 

I also have had some very light vibrations at idle that are odd.

After it rained hard, I live in AZ so it is rare, my car has done two things:

It has a little roughness (vibration) in the steering wheel upon acceleration that is random.

It has a little bit of a vibration at idle that did not exist before.

I have 10K miles.

Maybe these Cobalts do not like humidity or something.

 

when i have the ac on if i come to a stop my rpms just from like 500 to 1000 idk if thats normal or not but its only when i have the ac on

 

Ithink there is a reflash for your problem,the rpm should not be hunting like that.

But ive noticed when the A/C is on that there is aslight random vibration.I just think there is to much load on the 2 liter at idle for the A/C that makes it do that.

 

wierd because when i put my a/c on its actualy stop the shacking, the AC put a small load on the engine, just enought to make the shaking disapear.....

 

Wow, my new 07 does this exact same thing. I have only had the car for about 3 weeks now, has around 700 miles on her.

Mine started literally about 100 miles ago, lol! Happens ALL the time at stop lights, with or without the AC on, doesn't seem to make any difference at all!

Anyone find the fix for this yet, or is it just normal...?

 

My 06 does it all the time. I had the dealer look at it and he couldn't find it.....

 

i guess they just run rought.

 

Yeah, you notice it much more w/ ingals or solid mounts.