What is causing valve train rattle when I first start the engine from cold start

Asked by criket1010 Jan 29, 2016 at 07:07 PM about the 2006 Toyota Avalon Limited

Question type: Maintenance & Repair

When I first start the engine I hear a loud valve train rattle for about 1 to 2 seconds.  I get this every time the cars sits off for about 3 to 4 hours.  Once on the car is quite and very smooth.  I change the oil religiously every 3K and only use Mobil 1 synthetic.

3 Answers
223,915

Rowefast answered 8 years ago

There is clearance for the moving parts so when the engine warms up and oil pressure builds up, then the engine quiets down.

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F_O_R answered 8 years ago

Cam chain rattle until the oil pressure driven tensioner takes up the slack in the chain.

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65,510

firebird338 answered 8 years ago

Try adding some Lucas Engine Oil Stabilizer for synthetic oil. No promises but it my help.

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