I know this has been discussed in the past, but it's worth a shot. Supposedly, the cam phasers don't "park" correctly. For people that have the rattle can sound after start-up, try turning the car to the "ON" position (engine off). Let it sit for 10-15 seconds (prime the HPFP); then, start the car. Obviously, you might have to replace the cam phaser solenoids, but it might help/fix the problem. Just looking out for you guys.

 

interesting. sub'd for further info

 

I'm curious to see if this helps/eliminates the issue. It usually happens in colder weather.

 

My car does like to make sounds, ill give it a go

 

Subby sub'd.

 

Definitely report back to see if it helps.

 

sub'd

 

interesting....I had this happen on my LE5....in for futher info as well

 

so this would be a VVT issue correct? im pretty sure, just dont want the SC and L61 guys thinking they could have this issue.

 

ive had this happen to me before in the past. I have be putting my key in the ON position for about 5-7 seconds before I start it and it hasnt happened yet. I dont know if its the solution or if my car just decided to stop doing it lol

 

no....not only the LSJ and L61 people can have it....because I had that on my LE5

but thankfully not my LNF

 

can someone post a video of what this sounds like...? i might have this in my LAP, if possible

 

let me see if I can find a video to psot, because I never recorded my LE5 doing that noise....I should have done it though

 

It's tough to get a vid at least for me cause it only happens like 10%< of the time.

 

I really think it has a lot to do with it.

This is the only video I could find with the sound (best one):

 

i thikn that is the noise.... but mine happens much longer

 

My car does this on cold starts too. The guys at GM said that its normal for our cars because of the variable valve timing.

 

That might not be good. I hope it's the cam phaser issue, lol. There's supposed to be a thread whereas this GM engineer said it was "normal." I probably didn't look hard enough or something.

 

True, the cars do have the VVT; however, like the MS3's DISI/VVT, they have to replace the VVT solenoid. But, I've heard "normal" thrown around a $hitload of times, haha.
As long as it doesn't do it more than a couple of seconds (constantly), I think we'll be ok.

 

Hmmm.... Never bothered to pay attention if my car did this or not. Thanks guys, just gives me more weird sounds from the car to worry bout lol.

 

Well, ive been doing this for a week or so, and it does seem to be stopping the noise id say almost completely

 

is the solenoid the actual thing on the gear? or the sensor?

 

Mine has made that noise for years now on cold start ups. Lasts for no more than a couple of seconds. Am I worried? No.

 

Good deal!

 

Here's a good thread on this: https://www.cobaltss.net/forums/08-1...14/index3.html

Here's a good post within said thread:

"This "ratcheting" noise at cold start up (when it's really cold outside) has been answered long ago by a GM engineer (Bill if I remember correctly) and it is the cam phasers. He went on to say that it does NOT hurt the car and it's basically the phasers running dry for a few secs and once they get oil it stops. I run 0w-30 for the winter and that noise has never come back after 2 winters."



I wish we could find Bill to answer this, lol, or at least find the thread.