09TcSedan

so ive had my car in twice now for this cold start noise. they replaced a couple of parts,cam phasors but i forgot the invoice on what they replaced at my work on my desk.

the NOISE is still there on cold starts!!!!! IDK what to do!

a good friend of mine works at the dealership and he hasnt worked on my car but he did take it to lunch and found out the front control arms needed to be replaced (he noticed a slight clunk)and he got them replaced under warranty. so after a week of the dealership having the car,i finally picked it back up yesterday but this morning i go to fire her up and the noise is still there!!!!

so i called my buddy (who works at the dealership) and told him the noise is still there. he said they will replace the timing chain next... WHAT THE EFFFFFFFFF DO I DO? be a picky ass customer or on of 'those' customers??

the noise is more annoying than anything. i dont think it is hurting anything but idk that.

here is the other thread i was talking with a couple others who had the same issue

https://www.cobaltss.net/forums/08-1...art-up-267514/

rogersj

if you could get a video maybe we could pin point it better

09TcSedan

ok ill try to get to get one tomorrow when i leave work. its the shortest noise ever. all i have read on these cars ive never herd of anyone saying anything about a cold start noise being normal.

Frogstofall

iTrader: (1)

Sounds like a quick moving dry grinding noise right? Mine does it every now and then. There is a TSB for it. Check this thread... https://www.cobaltss.net/forums/08-1...art-up-267514/

Edit: just noticed you linked the same thread. Haha. My bad...

09TcSedan

i got a video of my car on a cold start today but im just leaving work so when i get home i will upload it. never uploaded a video on the internet before,anyone have any tips?

user 72239

iTrader: (4)

I noticed my car makes a wierd noise on startup, but only for 2-3 seconds then its fine.

09TcSedan

prolly the same noise mine is making. drives ya nuts

nobody2u

Mine makes this like 'rattling' noise for a second on cold starts every now and then, same sorta thing?

user 72239

iTrader: (4)

Yeah its a tad bit annoying, but that TSB says only 09-10 SS's are affected and mine is an 08. Is it doing any harm?

09TcSedan

from what ive experienced,no. but i am not 100% sure on that. im not mechanic though lol

user 72239

iTrader: (4)

huh. interesting. Let us know the outcome of your repair, I dont have a warranty on my car and I dont even want to think what the charge would be to repair it if I didnt.

09TcSedan

im waiting for a call back from the dealership to bring my car in for round number 3 to try and fix this cold start noise. its driving me nuts!!!!!!

AndrewSS/TC

Mine used to, disabled cat warm up and it stopped.

RomeDiggy

I'm going to try this, only does it when it is about 35 or lower out. My 2010 only has 11700 miles. I hope it isn't messing anything up.

cubaniche

iTrader: (1)

Look guys, the best that I can come up with in theory about this issue(cause Ive been trying to figure it out after about 10mo of owning the car, it started) is that the chain tensioner is somehow loosing its pressure and allowing slack in the chain to develop while the car sits for more than a few hours. Then when you start it the chain slaps a bit on the chaing guide while the slack is taken out. I believe that is the sound that we are hearing for that first second at startup, the chain slapping the guide cause it was a little slack.

My only issue with this theory is that Ive had my tensioner replaced twice already LOL

09TcSedan

lol^^

my buddy who works at the dealer said that if the sound is still there,they will start with replacing the timing chain and tensioner.

of course i have a video and you can hear the noise but now my damn phone wont let me upload the video onto my computer.

xodus

iTrader: (3)

^^^^ same for me also.

cubaniche

iTrader: (1)

Here you go! Told you the tensioner was the cause. Took mine apart this weekend because my chain guide snapped. I suspected that the tensioner was loosing pressure thus releasing its hold on the chain, allowing it to go slack. Then, once you start the car the chain slack moves to the intake side where it slaps up against the chain guide there. In my case it caused a failure.

The seal in the tensioner was the culprit! It had come apart and was allowing the oil to seep passed. This caused the hydraulic pressure to lessen. Anyways, I replaced the o-ring with a slightly thicker more robust version I found in an o-ring seal kit, metric not standard. Pics!:
Carnage:


Tensioner apart:


Seal broken:


What it looks like almost put back together. See how the seal is supposed to keep the oil IN the tensioner? That whole assembly sits inside right at the edge of the tensioner keeping the oil in so the piston stays snug up against the chain(guide):


After I replaced the seal and installed the new guide and set timing and put all that **** back together...LOL...she hasntONCE done that sound again. And she has sat overnight without issue, whereas before she'd be off for an hour or two and Id get that noise. Just sharing my experience. I have two other tensioners that I took apart and checked, both the same....seal torn. Why does it keep happening to me? I have no freaking idea but I hope this new o-ring holds up. Also, it still could be the chain or some other cause for you guys, but this seems the most likely.

09TcSedan

holy **** man! im calling the dealership. i still havent called them yet! ive been searching for a leaking pipe in my house for the last week but i fixed that problem so tomorrow im calling the dealership asap for this,when i had my car in the last time they said if the problem was still there they would move to the timing chain and check alll the parts around that. i hope it dont happen again to you man! thanks for the pictures and stuff!

cubaniche

iTrader: (1)

Glad you got the leaky pipe at home fixed! lol

No problem man. Were all here to help eachother out. I hope it doesnt happen again either. So far so good. Why my particular engine is killing the seals on these last three tensioners is beyond me.

09TcSedan

yea dude for sureeee. from the leaking pipe problem to the car now. never ends

cobalt mini bullet

trying to get ahold of the dealership to get this checked out... its a ******* joke. yet again... history repeats itself

cmiller8006

iTrader: (3)

Sounds like the cam actuators.

cobalt mini bullet

its coming right from the timing chain area. Either way the motor is under warranty. Just waiting for them to get back to me, an give me a rental

Chevrolet Cust Svc

I hope everything goes well, and if I can be of any assistance please be sure to let me know!
Sarah
GM Customer Service