ive taken my 07 LS to the dealership 3 times for this sound and they say theyve performed tests and everything but theres a ticking in it. it gets quieter after it warms up it seems. their saying its the fuel pressure regulator that ticking and that my engine is perfectly fine.. im about to roll over 84,000 and i dont believe them... im thinking its the valvetrain.. and that they dont want to fix it due to LAZYNESS and its still under warranty. Any thoughts or experience with this?

 

If the ticking keeps a pretty steady beat, then I would be inclined to believe the dealer diagnosis.
Now if the ticking gets faster and slower(i.e. with the engine rpms), I would suspect the valvetrain or other internal noise.
While in neutral with the hood raised, listen to it at idle and slowly increase the rpms. Have a helper operate the gas pedal. You should be able to narrow it down to engine rpm influenced or not.

 

Is the noise coming from the passenger side of the engine?
Is it more noticeable on cold starts? Has the timing chain tensioner ever been changed?

 

My injectors sound like a sewing machine. I am too LAZY to worry about it.

 

Possibly the high pressure fuel pump if it's an SS. There is a TSB on the ticking sound as it's the same problem on the Sky Redline's and the Solstice GXP's.

Here's a link to a post on this site with numerous TSB's which has this one listed.

https://www.chevyhhr.net/forums/showthread.php?p=368648

 

oh with RPMs increasing it gets louder. thats why i call BULL**** on the dealer

 

PROD- it sounds more center if not a little more driver side. im not sure of the chain tensioner i bought her at 74,000 back in 8-2-2012. and the sound was there then, but very very faint..

 

At this point changing the tensioner wouldnt be a bad idea, but that would be coming from the timing chain cover on the rounded side of the engine.
If it were an older car Id say a worn connecting rod bearing, but these ecotecs are pretty good for that.
Do you know the trick of pinpointing engine noise using a long ratchet extension or other solid rod? Touch one end to the running engine, and cup the other end to your ear. Try it in several places to see where the noise is loudest.

 

the ticking is up high for sure. it doesnt sound underneath, ive crawled under to see if that was it *had that issue with my 99 grand prix 3800 series 2*

 

Got a cellphone or other way to get sound/video? Maybe post a video on youtube?