2012 knocking during start up - Page 2
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  1. #11
    Junior Member
    Join Date
    Jan 2015
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    Oklahoma City
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    2013 Azera with 20800 miles. Sounds like a bag of bolts is thrown into the engine on a cold start and after cars sits an hour or 2 when cold out. It's embarrassing because people look, often say "what's wrong with your car? Listen to this video, listen on good speakers/stereo to hear well.....
    Here is what mine sounds like every day, and if cold out....after sitting just an hour or two. This can't be normal.

    http://2013 Azera cold start noise: ...VwxOq5n2xw</a>

    https://youtu.be/UVwxOq5n2xw
    Last edited by Woofmaster01; 03-27-2015 at 04:39 AM.

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  3. #12
    Junior Member
    Join Date
    Aug 2012
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    3
    The problem is worn valve timing chain tensioners. (See other comments re: tensioners). The original design had ratchet teeth to hold position on shutdown; apparently they fail due to wear and/or breakage. Result is that if the engine sits for a while and the oil drains from the oil filter (relatively high on the engine) and the tensioners, there is slack in the tensioners allowing the timing chain to slap around (rattle) for several seconds on startup until the oil has a chance to build up pressure, actuating the chain tensioners and stopping the loose chain and its noise. This is an apparent design flaw of the 3.3L engine in all Hyundai and Kia products. There is a service bulletin for replacement of chain tensioners ( http://novaresource.org/Hyundai/06-20-002.pdf ) issued in 2006 for the earlier engines, and one would expect that the "updated" item would be used in the later models (like my 2012). Does not seem to have been totally effective.

    I am not confident that just letting it go is appropriate, but the dealer says the rattle is "normal".

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