Question about 2006 Hyundai Sonata

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Engine knock noise on cold startup

2006 Hyundai Sonata on cold startup the exhaust puffs blue smoke and the car knocks almost like a lifter noise for about 30 seconds or so. Very loud and doesn't do it all of the time. Mechanic suggested that it is from using purolator oil filter cartridge and the oil is leaking out of the oil filter and is dry on startup...I did not think it was the oil filters job to keep oil at the top end of the motor when not being used

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  • Anonymous Jan 24, 2009

    My Hyundai Sonata does the same thing and I have never figured out why?
    It makes a weird catching noise if it has not been started for a while.


  • Anonymous Mar 22, 2009

    cdfghjk

  • alokjerry Mar 22, 2009

    i have same lifter problem after cold start. i took it to the dealership, they say its all fine and normal. i also confirmed for long drive. they say it was good to go. and finally my car broke down. i could see a part that came out from the engine. can any one give me the solution. i love my car and dont want to sell it.

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These 3.3l engines are equipped with timing chains. if vehicle has prolonged down time, typically more than 4 hours, vehicle makes a chatter until the timing chain tensioners put tension on the chain. you will need them replaced.

Posted on Feb 09, 2009

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This type of smoke on start is caused by worn valve stem seals and loose valve guides, if the noise is lifter noise ( sounds like it may be) replace the cam followers, that should cure the issue, on the other hand a tapping noise is not bad, an actual knock is very bad, and means either the car has piston slap or a defective rod or main bearing.

Posted on Nov 29, 2008

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Hello onarock844...The Hyundai 2.4 litre and the 3.3 litre are known to have valve train noise. Some sooner than others.
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Time for a new vehicle...

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