During startup, the bad bearing will create rattling noise, which typically goes away after it is lubricated by oil or after it heats up and slightly expands, making it run quieter and smoother. There are other reasons your engine can make rattling sounds at startup, which goes away shortly. It may also be because the pulley belt is already.. High Mileage. Improper Repair. Worn Accessory Components Cause Engine Knocking On Startup. Worn Main Bearing Causes Engine Knocking On Startup. Oil Drain-Back Causes Engine Knocking. Conclusion. Sure enough, you give it a few moments, and once your car runs for 30-60 seconds, maybe even a minute or two, the noise goes away and your commute goes.

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5 Reasons Why a Car Engine Knocks on Startup then Goes Away (How to fix it) Piston slap. A piston slap is often a cause of a cold start engine rattling noise. Normally, pistons in the cylinder should have a smooth up-and-down motion when the engine is running. Now, a piston slap is when the piston(s) and the cylinder wall don’t have tight.. Start-up clatter & rattle issue solved. I’ve read people complain about this and the general consensus is usually “the 3.6 clatters on startup – don’t worry about it”. Well it really bugs me to think about parts rattling around without sufficient lubricant so I wanted to see if something could help. I switched to Amazon Basic synthetic 5w-20.