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Here's Why Your Car Rattles on Cold Starts

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Added by intercd
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Do you hear a rattle from your car's engine on cold starts?


The reason is the variable valve timing actuator pin can wear out and not engage when the vehicle is parked. Once all the oil drains out overnight, the actuator rattles before catching itself back into place until oil pressure is built up.


In this video, we take a look at where the VVT actuators are located on a 1MZ-FE V6 Toyota VVT-i engine, take it apart and examine the wear on the VVT-i actuator.



The remedy for this issue is to replace the actuator which involves removing valve covers, the timing belt side of the engine and the camshaft. Typically at the age these fail it its not worth replacing, and it shouldn't be of severe harm to your engine. A heavier oil weight or stabilizer (such as Lucas) might help dampen the sound, but ultimately the wear on the metal components will still exist.


Make sure you change your car's engine oil on time!
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Category
HOW TO

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