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Startup Clatter--Timing Chain Tensioner?


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I've got (and have had for some time now) a loud, metal on metal type clatter noise on startup. After trying various 'fixes' (oil weights, etc) I'm still hearing it. The sound lasts for approx ONE second, on COLD starts as the engine does its intial reving to 1-2K rpm upon turning on ignition. (only cold starts). The noise is almost grind-like, but could sound like a chain or clatter...

Never hear it after that initial start. Any chance that could be a loose/snapped "Timing chain tensioner"?

Brought to dealer, but could not replicate it for them.

Also, perhaps more importantly, assuming that is what it is, can I leave it alone...or will it worsen/damage other compenents.

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I've got (and have had for some time now) a loud, metal on metal type clatter noise on startup. After trying various 'fixes' (oil weights, etc) I'm still hearing it. The sound lasts for approx ONE second, on COLD starts as the engine does its intial reving to 1-2K rpm upon turning on ignition. (only cold starts). The noise is almost grind-like, but could sound like a chain or clatter...

Never hear it after that initial start. Any chance that could be a loose/snapped "Timing chain tensioner"?

Brought to dealer, but could not replicate it for them.

Also, perhaps more importantly, assuming that is what it is, can I leave it alone...or will it worsen/damage other compenents.

Are you sure it's not just the hydraulic tappets refilling with oil pressure that you hear (perfectly normal). I found that using a very good quality oil with a high Ester content (such as Silkolene Pro S - this 'sticks' to the metal surface to add protection - similiar to 'Magnatec' but far better quality) and have experienced a much reduced 'clatter' at start up. The noise is still 'there' but not as alarming as hearing metal to metal if the car has been left for a week or so (like it did when it had Mobil 1 0w/40 in it ... ) <_<

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