How do you solve the engine clatter when accelarating?

So being it doesn't clatter in electric mode, a safe assumption is the noise is with the gas motor.

Usually a clattering noise is valvetrain noise, like a lifter not pumping up.

Low oil will cause this.

3 quarts low would probably definitely cause this!

You need to find out why you lost 3 quarts in only 80 miles!

Sounds like you got a bearing or push rod going out. Does it make a tickining sound. That could be a lifter. But if engine is makeing a metalic clattering sound, its about to let loose..

You will need to remove the valve cover and inspect it, otherwise it is anyone's guess what the noise is.

There is a variety of causes possible:

- spark plugs fouled or worn (likely after about 50000 km)
- low fuel pressure (maybe)
- ignition timing not correct (an ECU problem, is there any check engine light?)
- air leak into the intake manifold (the most likely)

These engines develop a split in the big hose from the air cleaner to the air flow body. Look for that first.

The engine needs to be replaced. Clatter can be the main and rod bearings or the lifters. Lifters clatter with no oil pressure. Low or no oil pressure is usually bearings. Oil pumps rarely go bad, they are a very simple set up And work forever. I have never replaced a pump because it was bad. And running an engine for 30 seconds would not do that kind of damage. But running a long time low on oil will.

more than likley it will be that it is low on oil or coolant, but it could be that you need a new thermostat

a toyota dealer has the kit to switch it off...leave it on its not doing any harm.....

Check your engine oil level.

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?