Rattling sound from engine

welcome to priuschat! it's probably a heatshield or something rubbing or vibrating.

 

Have you been good about checking the oil level in your car? An overfilled, or underfilled oil reservoir can cause numerous problems, including damage to your valve train/guides that could cause the rattling sound you describe.

 

Clutch? MG1, MG2 and the gas engine are all on the same shaft. Someone correct me if I'm wrong, please.

 

This is a weird possible culprit - we had a rattling sound only at low speeds (with or without gas engine) and it was a pebble that found its way into the rotor. It sounded almost as if it was coming from the cowling that surrounds the exhaust system but it was indeed a medium sized pebble.

 

i hope they didn't charge you for the tune up! anyway, why don't you take a new one for a spin with the toyota agent and see if it makes the noise?

 

Exactly what it sounds like, there is a space on the inside of the rotor (passenger side in our case) it would clang around inside it and occasionally hit the metal shroud that is probably there to protect it from debris (lol). They sorted it out by removing the passenger wheel and rotor - the pebble was between 1/2 - 3/4 inch in size and was nicely burnished from the time it spent rolling around in there - pulled the rotor off and it fell out.

 

I vote for heat shield against body/chassis somewhere, likely at back end.

 

I had a similar sound that sometimes occurred between 1600 and 1700 rpm (scangauge). It never sounded like an engine or mechanical problem, just a sort of tuned rattle. While touching and moving things in the engine compartment looking for the possible culprit, the one thing I was able to make noise with was the small black clamp that holds the rod that props the hood open. When the rod is clamped into it, it might act as a sort of tuning fork with a rattle.

I wrapped a rubber band around the base of the clamp and haven't heard the sound since.

I'll be tickled if this solves your problem as well.

 

Consider yourself tickled. I've been having a rattle sound as mentioned by the OP. When you mentioned the hood rod, I thought, I just changed the air filter. Did I forget to snap it back in its holder? Yup, I opened up the hood and the rod was just dangling there on top of the ICE. No more sound. THANK YOU!

 

Did you manage to find out the reason for this? I am also facing this issue with an Aqua 2013 I purchased in August 2015.

 

Maybe the gas you're using? Where I live gas is very poor quality, and when I fill up with 91(which is really about 88) as stated by the manual engine begins to rattle, therefore I use a higher octane gas and rattle goes away.

SM-J105M ?