I have a 2010 Corolla S, automatic with 68,000 miles. Bascially, I have a Corolla that *sometimes* makes a rattle/grind noise for about a second during cold startup on cold days. I see there's a TSB out there for the camshaft timing gear on some 2009 Corollas, but of course my VIN is not elegable for the repair. Plus, my car's mileage is past the warranty - the issue occurred well within the warranty period, but the dealerships could never recreate the issue. So, I'm stuck. I emailed Toyota Corporate and basically got a "sorry, can't help you" response.
My questions are:
1) Is this something I can tackle myself without a ton of effort or is this something I should take into the shop?
2) If I let someone else fix it, what would a job like this run so I can shop around and find a decent price.
3) Most importantly, is this an issue that needs to be fixed, or is it just an annoying sound? If it doesn't cause any damage, problems, or pose any safety concerns, I may just deal with it.