might have to go in for this

 

I experience this as well.. Happened right around 35k miles.
The engine starts up normally, then a second or 2 later the noise happens. I was always under the impression it was the starter not retracting fast enough due to it being cold outside, as once I do it for the day it doesn't happen again unless the car sits for an extended time.

 

im taking mine in right now lol

 

Mine has done this since new.

Fiancee's Carolla makes the same noise. Funny because her brother said it's not an issue.

I was like How can a loud engine rattle not be an issue?

 

yea i dont get it. mine still dose the noise. maybe a little less then it did before i took it to the dealership. i called my buddy who is a tech at the same dealership and hes going to go talk to the tech who worked on my car and see what he did. if not shes goin back in!!

 

Those are the CAM Phaser solenoid part numbers I think. The two cylindrical objects sticking up off the valve cover to the left. But the TSB says to replace the phasers(actuators) themselves (the sprockets on the cams). Interesting because Ive had this same issue.

 

i just talked to my buddy who works at the dealership and next week im going back into the dealership next week and get it fixed. im pretty sure you gotta pull the valve cover off to access these selenoid,right?

i will see what happens next week.

the noise is more annoying then anything. idk if its actually hurting anything but we'll see what happens

 

Well, to replace the solenoids(the two cylindrical parts sticking up from the head on the left side) can be replaces without pulling the VC. Its just a bolt holding them in place and they have their own gasket and rubber seal that keeps everything from spewing up out of the head. Now, the CAM sprockets, the actual ACTUATORS or PHASERS ar on the CAMs. That requires the VC to come off and the timing cover to come off and the timing needing to be reset afterwards.

Let us know what comes of this. I replaced my CAMs and Sprockets with new ones but not the solenoids and I still get the noise from time to time. Im probably going to go ahead and replace those ASAP just in case.

 

My car does this, I have had a plan to change the actuators this winter since thats where I think mine was coming from, I already have changed my tensioner with no resolve.

 

When are you going back into the dealership? If I can be of any assistance, please let me know (although it sounds like you already have some great help at the dealership).

Sarah
GM Customer Service

 

Yeah, I think thats what may have caused this, only on a more severe level:





I have since then replaced the intake sprocket and I just put in brand new stock CAMs. I still get the sound though so now Im wondering if I should replace the solenoids too to be safe and the exhaust sprocket.

 

im going to see how this goes next week when i go in. ill prolly be there watching while my buddy will be working on my car. so ill see how this goes.

 

Anyone have the part numbers for the actual actuators and the solenoids? I'm replacing my head and cams as soon as comp cams fixes their cam machine according to a e-mail I got from zzp, so I guess I'll replace them and the solenoids since it seems to be a common issue and I have it every once in a while as well, but haven't noticed it since I temporarily fixed my stock head and boost leak. Maybe I'll recover a few ponies as well.

 

Nevermind....was looking for this...
http://www.crateenginedepot.com/stor...ings-C276.aspx

 

OP, you got an update on your issue? Im interested to know if they replaced just the solenoids or the phaser sprokets as well.

 

my car does this sometimes too....but my question is.

DOES ANYONES CAR STUMBLE OR HESITATE ON THE COLD START TOO?

basically i start the car when its cold and the rpms jump to around 1500 like normal. then almost immediately i get the sound you guys are describing on occasion but its almost always followed by a drop in rpms to 900-1200. then after a second or two it jumps back up to 1500 rpms to continue the cat warmup cycle.

 

Mine never did that. Only time it ever stumbled like that was on foggy/humid mornings. And that was on my old AEM and HAHN CAI. Its never done that while on the K&N SRI.

 

Yes but not a real bad stumble. Like a couple hundred RPMs at the most.

 

I understand that a visit to the dealership is not always a preferred option, but if you were to decide to go in for a diagnosis, please let me know.

Best,
Sarah
GM Customer Service

 

thats what mine does. on colder mornings i fire it up and initially it revs at 1500 rpms and then the cam phasor problem kicks in and the rpms drop down to 900-1000 and then the rpms go back up to 1200 until it gets warm and slowly idles down

 

09TCSEDAN....did you replace anything that actually fixed the problem?

you say cam phasor....is it just the solenoid part or was it a whole different issue?

 

Weird, mine makes the sound almost immediately when it first turns over, lasts a few seconds, then goes away all together. It's not associated with an RPM drop since the motor has literally just turned over. Since the dealer I go to is basically now an expert at LNF teardown having done the valve replacement on 4 of them, maybe I should ask them to take a look .

 

well the dealership says they replaced the cam phasor. i put the part numbers up in this thread before. i looked at the receipt and thats what it says they did. but i dont think they did. they prolly half assed it. im calling right now cause its starting to **** me off

 

To the person that said Does anyones car stumble on Cold starts??!?

Mine always has quite a few stumbles during the cold start. I wasnt sure if it was an issue because no codes are tripped or anything and I know our cars have typical missfires during cold starts from factory. It feels like it drops a 100rpms or so every stumble and it does it maybe 15 times during the cold start cycle. Once its out of cold start it idles fine though.

I havent heard this sound everyones talking about though.

 

well i brought the TC in. the dealership kept her over night and this morning they did the cold start and herd the cold start noise. they are going to pull the VC off tomorrow and go from there. they think its a timing chain,rocker maybe. they will have my car for a week or more they said. its good to know people who work at the dealership and take care of you. well see what happens