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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Re: Engine knock noise on cold startup
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.
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Re: Engine knock noise on cold startup
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.
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The white smoke would indicate a blown head gasket. If water is getting into the engine it could cause that knocking noise. The other issue with the knocking could be as serious as a rod through the engine block.
it may need a lifter or valve adjustment when cold they will tick or knock depending on how loose or worn out then when it warms up they swell with heast and noise stops. after adjusting or replacing it will stop making noise
Hello onarock844...The Hyundai 2.4 litre and the 3.3 litre are known to have valve train noise. Some sooner than others.
The timing chain tensioners on the 06 and 07 Sonata 3.3 engines built before August 4, 2006 are well known for developing wear that allows them to make a tapping or rattling noise for a short time after a cold start. This noise can be mistaken for a lifter noise, although the actual source is in the front cover area of the engine. Hyundai has released a technical service bulletin on this problem, which describes installation of an updated design timing chain tensioner (part #24410-3C300) to correct this noise issue.
Ask your dealer to refer to Hyundai service bulletin #06-20-002 for information...If this has already been corrected,,,and the noise is coming from the upper engine area and not from the timing chain area, then the valve clearance will need to be adjusted. This is done by disassembling the valve train and installing slightly different size tappets to change clearance.
This is a fairly labor intensive process, so if you are still under factory warranty then you will want to go over the dealer's head and get the Hyundai zone rep involved to get it covered before your warranty coverage expires... I recommend useing a full synthetic engine oil, i know in a few cases where the noise has stopped when the oil was changed over to synthenic, also a high quality filter is important, such as a purolator. Good luck...i hope this helps...please rate me a fixya.
Is there any smoke when you first start it? what is happening is the valve seals are probably worn and letting the oil seep past them. when your engine is first started it has no oil or very little oil at the top of the engine, thus causing the knocking noise. could be more but this is a most likely answer. oh and is you haven't changed your oil every 3,000 miles you had beeter start doing it....
answer knocking sounds usually come from bottom of engine try a better quality and correct viscosity oil