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hondaminhtt

Rattle

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2004 Corolla 1.8L, hearing a rattle from below the engine when cold and in gear. Goes away when warm.

I was underneath the car checking the exhaust. Sounds like its coming from the oil pan area.

It has new belt tensioner, belt, and timing chain tensioner.

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As long as it goes away when warm - nothing much to worry about.  The 1ZZ-FE engines are known to be exceptionally noisy, especially from a cold start with a car with some mileage on it.  Mine sounds like a blender with a handful of bolts tossed in, until it just starts to warm up - then it quiets down considerably.  Got over 253K miles on my 2002 (nearly the same 1ZZ-FE that is in your 9th gen Corolla).

If that noise is really bothersome - and you've ruled out the simple stuff (loose exhaust pipe / cracked exhaust, etc.) - then you might try experimenting with different motor oil brands.  Something like Mobil 1 synthetic is known to shear down with use, meaning that it gets thinner over time - but others, like Amsoil, Castrol Edge and Pennzoil Platinum tend to shear thicken - getting thicker with time.  Have to experiment and see what helps with the cold running noise and which runs best in your engine.  For mine - Mobil 1, Redline, and Valvoline Synthetic work the best - fuel economy and overall oil lifespan and protection (used oil analysis results).  But something like Pennzoil Platinum and Castrol - noise is less, but my MPG tanks - dropping an easy 10-15% and off no additional protection (comparing UOA results).

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