Hey guys, im getting a weird chatting/metal on metal knocking noise coming from the timing chain / cyl 1

at 1,100rpm its really bad, at idle it sounds like chattering in a loop. im trying to upload a video now

when driving i cant really hear it or when revving over 3k

My buddy who is a technican says i almost sounds like piston slap, how ever after looking at it for a while says it sounds more like chain tensinor issues, i found a video on youtube of a more violent version of my noise, and the issue was a broken chain tensioner bolt.

Anyone with simlar issues or know of anyone with this

Thanks.

Is yours a 07? Myself and a few others with the 07s had an issue with the timing chain tensioner going bad, and it has the chattering sound at idle you describe, its more noticeable at start up

Mine is an 06 built 10/05 i saw the TSB on the late 06/07 timing chain issue.

I think its more noticeable during cold but not 100% sure

Im due for an oil change so im going to get on that and see what happens

dude i TOLD you it was ur tensioner, sit tight and bring it by tomorrow

Yeah i know man, i just want to get as much info as possible

Anyone else have something to add?

here is a video, not the best but better then nothing

http://www.youtube.com/watch?v=PuB2DkS8st8

def your tensioner dude, im on my third one. make sure you get the revised one from c.e.d.

Thanks man, is it an easy install or what?

Im under warrenty so im gonna prob take it to the dealer ship

it has to look like this...
http://www.crateenginedepot.com/store/Ecotec-Timing-Chain-Tensioner-12608580-P2216C133.aspx

its a breeze unscrew old screw in new.

Ah okay, i assume you take off the valve cover and it will be there? would anything else have to be done, i dont think i would be comfortable doing this, done lots of things, but this i dont think i would try

you dont have to take nothing off, its on the back of the motor. the old unscrews the new one screws in its that simple.

it take me 10 min tops

Oh really. Thats interesting, i have never seen it, So i did a bit of research and it seems a few people have this issue, and this is the fix for it?

Will it be okay to drive on? no boost, just get me from a to b

Thank you for your help.

bump

bump for help please :)

Anyone else?

I'd advise against driving on it, simply because its a critical part of the engine. That thing fails and timing jumps, say bye bye to a bunch of shit.

Ok thanks, anyone got any other guesses as to what it is?

Take it to the dealer and get it done under your 5 year powertrain warranty(100,000km) look in your car info that came with the car when you bought it ,should be a copy of your warranty in there.

Heard the video and would think if it was the tensioner it would have more of a rattle to it.
But let us know what happens.

hey i got same issue. fixing mine tomarrow

it sounds like there is something lose inside the head by cyclinder 1. makes sense.

My car sounds exactly like this! http://www.youtube.com/watch?v=v9huwAibdBo

Tensioner .......Had the same issue and replacing the tensioner fixed it. Some people just unscrew the old one and pop in the new but thats not the proper way.

You should release the tensioner before turning the car over. If you just screw it in when it's compressed (and it has to be compressed for install) ....you have to wait for oil pressure to release it. For the little bit of time it takes to pop the valve cover off it's worth it . Otherwise you risk jumping a tooth on the timming chain. With the Valve cover off ... give the chain a tap at the tensioner and it will releases. The valve cover gasket is reuseable so to me it's crazy to take a chance like that to save time .

i had the same problem on my 05 replaced it and now back to normal