Question about 2000 Cadillac Catera

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Extremely loud clattering, clinging, knocking noise near the top of engine, as if there's no oil, recent oil change.

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Posted on Jan 02, 2017

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emissionwiz
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SOURCE: 1999 cadillac cateria, oil was low, put oil in.

U have a burnt out connecting rod bearing, u will need to replace/rebuild the engine

Posted on May 27, 2010

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When I start the engine first thing in the morning it makes a clattering sound,until it runs for a minute


the clattering is most likely valves rattling until the oil gets up to top of engine,recommend change the oil and filter,use a good filter like fram oil filter,i've always used castrol 30 weight oil in winter,then summer 40 weight, also recommend you add lucas oil treatment,1 bottle,add with your oil change for top end lubrication,the oil stays and clings onto valves and adds a whole lot more of top end lubrication to your engine than just regular oil.it's just a treatment,i have a 1994 ford explorer with 450.000 miles on it.just trying to see how far i can go with original motor.but i always use castrol oil,fram oil filter and always add lucas oil treatment every time i change my oil.thank you for choosing fixya.com good luck!

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It all depends how loud the knock is. A tapping valve can be caused by low oil level, or dirty oil. Topping up or changing oil will solve the problem. A really loud valve tapping is abnormal. Cars sometimes make what you call a spark knock when accelerating hard. Extremely loud knock coming from deep within the engine is a bad sign, which means the engine has failed. Further examination would reveal metallic residue on the dipstick.

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I'd consider some fresh, clean oil & filter change first of all, if it hasn't been done . drive it for a while providing it isn't too bad, & see if it goes away, if not get back to us.

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how is the oil level and pressure?, how many miles on engine? is this a loud knock or rather a clatter/ticking noise? knock is engine rod or crankshaft bearings, clatter loud ticking is valve follower noise. how long before it (the noise) goes away?

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