Abnormal Sound From Engine Bay (Only At The Cold Start)

[Gamarala]

Hi Experts,

When I start the car (only in cold start), there is an abnormal sound keep coming from engine bay for about 5 - 10 minutes. But when the engine gets warm, this sound disappears. It is clearly a rattling sound from the engine bay. When this sound is present, I can feel a little vibration to the interior of the car. This happens only when I start the car in the morning. When the engine is warm, this sound is not audible. Issue started 2 weeks back. No repairs were done to the car for last 12 months . What could be the reason?

Car : Toyota Prius ZVW30 (mfd.year 2010)

ODO Meter : 88,000 km

Major Repairs : Complete steering rack and tie rods were replaced by Toyota Lanka 1 year and 2 months back due to a noise problem (at the cost of Rs. 114,000)

[RViji]

Ouch,new steering rack after just 88,000km?

Anyway about the rattling,try google for T-SB-0204-11. Some say it's due to carbon building due to non-aggressive driving style and goes away if you accelerated hard.

[gayanath]

Is your rattling sound same with this?