Why does my car sound like there is stuff rattling around in the head? It's not obnoxious but the noise is noticable almost like a deisel engine? I have stage II with a 2.9. What causes this noise?

 

timing chain..... maybe

 

Probably a chain tensioner going bad.

Or, try this:
Pull the big allen plug from the front of the head. I had the top bolt for the fixed chain guide back out, made a nasty noise like that.

 

what year is your car? if its mid 06 and early 07 and comes from passenger engine compartment...most likely timing chain tensioner. if it rattles at idle then goes away when u rev up, then comes back again- timing chain tensioner. get it fixed before it gets worse. crate engine depot has them for 50 bucks or so. GM had the wrong part randomly put on the assembly line during those years which is why it is failing
hope this helps

 

mine has been doing the same thing, and it seems like it has progressively been getting worse..... I also have stage 2.

 

pic of bolt please this is new stuff

 

get the new tensioner before the chain stretches out and youl have to most likely get the whole assemble replaced.... iu tried bringing it in for warranty work but it would never make the sound for the dealer. also go to autozone and get RESTORE oil additive in the meantime- it works like a charm

 

That could make sense since I've noticed it shortly after putting the 2.9 on. Could it be that it just needs to be adjusted? And if so would I be tightening or loosening it?

 

I got nothing, I sold that head

The big plug on the front of the head, right by the upper motor mount. 10mm allen key. Take it out, the bolt is right behind it. Try it and see, just a suggestion.

 

the timing chain tensioner will tension the chain itself i believer, you dont have to do anything correct me if im wrong

 

Has nothing to do with the pulley, its the cam drive chain, inside the motor.

The tensioner is a large nut on the back of the head, like 30mm or something.

 

okie dokie- worth a shot
thanks

 

Yes, its hydraulic based, it will maintain constant tension unless it goes bad (which makes that nasty rattle sound)

 

Thanks Ill have to take a look when its light out. Sadly I'm in FL and I'm prob fairing better then most but I had window frost tonight lol.

 

thats what i thought- its powerde by oil pressure? which is why restore may be an effective oil additive lubricant

 

i still have factory warranty, just waiting for the time to take it back in

 

Yeah, its in the 40's down here already

Yeah, it has a spring to hold base tension, but oil pressure increases the tension, so it can keep up with higher RPM demands. Some of them lose the seal internally and collapse, or get stuck and can't increase tension. Then you get the rattle we all love so much.

 

geez didn't think it would get as cold a little bit further south. Is it difficult to access this bolt?

 

everytime i hear that rattle in public i rev it up....its so embarrasing- look like a ricer in the parking lot

 

Crap I hope it doesnt need to be replaced, I hate taking my vehicle in to dealerships.

 

im telling you lol it does! but its really not a big deal, just go in there and own them. find the TSB on here print it out, and giv em hell. this is a part you do not want to wait on

 

fak! I wonder how long it would take and if they have to disassemble a lot to fix this if it is an issue.

 

about 2 hours of work. they have to take off the valve cover, hold the cams, and change the tensioner- i believe that is it ( correct me if im wrong) it would be less of a headache to pay th 100 bucks and have a shop do it dealdership mechanics can be hard headed bastards

 

Nope, its a really simple procedure. I could do it in about 10 minutes, you can get to it without opening up the motor at all really. You do have to take off the valve cover to release the set on the tensioner, but thats the harderst part.

 

I don't have a mechanic so I'll let chevy take the fall. I haven't been given any grief as of yet with mine. We'll see how it goes I'll have to remeber to post back once it's solved ect..