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Discussion Starter #1
Every blue moon, after sitting overnight the engine will start and idle very rough and with loud clacking noise (maybe from the heads?). I quickly turn off. Start engine the second time, the clacking and rough engine idle is only half as bad. Then finally smooths out to normal on the third start. I'm too scared to leaving it running for more that a couple seconds to see if it'll smooth out on first start. I've had valves click in cars before but never with a loud violently shaking engine too. Unnerving.

This issue has happened to me only a few times. I hoped the 60K service (timing belt change, etc..) would have cured it but it didn't. I now have 59K so I need to tell the dealer about this. Problem is that it'll proverbially never do this while at the dealership - even if I leave it there overnight - it's simply too random and intermittent to repeat therefore the dealership will probably through their hands up not knowing what to do.

Would the computer have recorded the incident this morning? Engine light didn't come on though.

What problem does this sound like? Any advise is greatly appreciated.
-eric
 

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You have what sounds like lifter bleed down. That’s where the oil bleeds out of the lifter(s) and upon startup, the oil has to fill the lifters again hence the clacking noise. Barring any other problems it can be a common occurrence. Do let the dealer know about. Let them check it even if it doesn't do it for them. It least is on record that you had an issue with it. It is tough to diagnose a problem we can't touch, hear, or feel. Like with all free advice get more than one opinion from different sources. HTH
 

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Correction. My wife (having better memory than I) reminded me that the Sorento hadn't been started in about 3 days (level parking). Oil bleed could definitely happen. But I can't imagine what I'm experiencing is normal behavior. Unless the engine is stopped in such a way the values and lifters hold the minimum amount of oil. And the temporary shaky/rough engine idle is bizarre. But again, it smooths out and no problems for a long while afterwards.
 

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Correction. My wife (having better memory than I) reminded me that the Sorento hadn't been started in about 3 days (level parking). Oil bleed could definitely happen. But I can't imagine what I'm experiencing is normal behavior. Unless the engine is stopped in such a way the values and lifters hold the minimum amount of oil. And the temporary shaky/rough engine idle is bizarre. But again, it smooths out and no problems for a long while afterwards.
We will assume only from your post and avatar and profile that you have @60,000 on a 2005 3.5L V6. Not where you live or climate. Next we would need to know your oil change sched (miles/months) and whom does it and what they use(all oil info and filter). After that more can be discussed and diagnosed. See below for help with what is recomended and most times shows NO problems like you have. Most all of our 3.5's at one time or other have cold start valve clatter after a LONG and yes three day weekend is a long sit for some of them. Mine has to sit at least a week before most times it will clatter.

Sched: 3-4 months tops or 3500+- miles tops on Dino oil and filter.

Oil: Kia recomends 5W20 or 5W30 depends on aval oil in your area. Dino oil is fine. Synth like I use is better and the change requirement is slightly diff form above. Will explain if you mail me.

Filter: Kia 26300-35503 or quality aftermarket like WIX 51334 Napa 1334 ect. Fram is not one of these and I do not care whom says so in here. They can use it on their Hondas and Pontiacs and Subarus. I do not even on a YUGO if I wish to keep a car trouble free.

As a side item that might cause after a long sit the same issues. Has the fuel filter been changed? And have you ever if so, put in as well an injector cleaner in the gas in the life of the vech? What RM gas do you use 87/89/91-93? Have the plugs been changed. Running RM89 you will get 60,000 or more out of a set. Running RM87 you will not. More so if you ran RM87 and never put in a cleaner.


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nstoolman1 makes a good point about oil bleeding, so you could try a good oil flush and a good synthetic oil, but more importantly, whats comming to my mind and it actually scares me is possibly the timing belt tensioner is bleeding down. I had a sorento just a few weeks ago that jumped 2 teeth on the timing because of a faulty tensioner.
 

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nstoolman1 makes a good point about oil bleeding, so you could try a good oil flush and a good synthetic oil, but more importantly, whats comming to my mind and it actually scares me is possibly the timing belt tensioner is bleeding down. I had a sorento just a few weeks ago that jumped 2 teeth on the timing because of a faulty tensioner.
And a sticking or bleeding down TB tensioner will show up as well from bad oil change habits. We still have not seen boo form him on his. So might be early to throw too much at the problem with no info. He might have a coked/slugged up eng for all we know. Waste of time till we know. HLA's do not like bad oil or slugge. 10w40/10w30 dino and 5000/7500/10,000 miles changes will do that. And a FRAM filter will not help matter at all. See my point. No info to base anything on yet. Lets see before we judge thing discounted/or causing it.


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how will bad oil change habits affect the timing belt tensioner? The timing belt tensioner is its own unit, it does not rely on engine oil pressure whatsoever to work. It has a built in spring with oil dampner inside it.
 

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nstoolman1 makes a good point about oil bleeding, so you could try a good oil flush and a good synthetic oil, but more importantly, whats comming to my mind and it actually scares me is possibly the timing belt tensioner is bleeding down. I had a sorento just a few weeks ago that jumped 2 teeth on the timing because of a faulty tensioner.
How will it effect it you ask now? You brought it up, see above. If the tensioner is bleeding down as you say above. And it is useing ENG OIL to get hydrolic pressure for tension as you suggested in the terms of the post above then. But now later I see change that to include it is a island on to itself with oil supply after I reply using that first post and data. Which I was lead to beleive was the case (it used small amount of eng oil/pressure) too, and you did not say other wise back then. Then dirty/bad/very beat with age and degraded oil will most certainly EFFECT it. Just as the HLA's do not like it so too does the tensioner systems. And that last I recall is called BAD OIL CHANGE HABITS at work. Mud/sluddge/watery dishwater is not a lube nor hydrolic worthy media. Or were you misquoted by me in your first reply and we misread your point up there. It was a good one, just supports mine too. Funny huh? But now if it really does in fact have its own supply, then I retract my statement. Since I assumed your defective post was supporting mine when it was not. Now that you cleared it up we move on. Unless the first two posts were right and the second is wrong. But we still have not seen any reply nor info from him yet to my question. So once again we can not make comments of anything other then a abstract nature till we do. Can be anything from bad (deglectful) oil changes to a mouse eating a wire. Nothing has been proven nor discounted form his none verbal further help to us to help him.


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