Hello everyone. Hopefully this is the correct place for this. If not please let me know.
I have a 2009 Cobalt LS XFE with 147,560 miles. I bought it about 5 years ago with 72,000 miles and have always performed routine maintenance (oil change every 3,000 miles, spark plugs, air filters, etc, etc). Once it got to 146,000, I knew it would be a good idea to get the timing chain, water pump, guides, balance chain, etc, replaced. I got a kit off of Amazon (it wasn't a Cloyes unfortunately) but I made sure I bought a new ACDelco timing chain tensioner (the dome type one) for it. I took it to a family friend, who is a retired mechanic to do the work.
The issue I have though is that after having all that replaced, my timing chain now rattles on startup. It only lasts 1-2 seconds and then instantly the sound stops. I have a video of it here: https://youtu.be/hrMnCITa9tQ
. It's driving me nuts trying to figure this out, as I love this car and want it to last as long as possible. The mechanic that did the work can't figure it out, so I've asked every other mechanic in my area (there are about 3 of them) to take a look, and each one has told me "That's normal for these Ecotec engines. Don't worry about it unless it starts doing it while driving it."
Anyone here ever experience this? I see a bunch of other threads where people get the noise BEFORE replacement, and changing to the new style tensioner fixes it. I unfortunately had the opposite happen. Never had any startup noise whatsoever and now after replacement I have the rattle on startup.
Any thoughts on what this could be? Bad tensioner? Installed wrong? VVT actuators? I would think if it was installed incorrectly I would have other issues. It has no check engine light, no rough idle, no other problems. It runs just as well as the day I bought it, it just has the rattle on startup. Any help or thoughts would be greatly appreciated!