2010 Prius knocking / rattle

How many miles on the Prius? Owned since new? Has this been noticed before?

 

did the 2010's get the erg or pcv advisory? i can't remember which.

 

That's the most recent recall. What @bisco is talking about I believe is the egr valve TSB, but for that to apply, it has to throw the P0401 code.

So no codes for your Prius when it does the shake and rattle?

So a previous oil change threw the "check hybrid system" alert? What was the battery level at on the HSI display? And it just went away when you powered down then powered back up? How long between today's occurrence and this occurrence?

What maintenance work has been done to your Prius? Just what was in the manual? PCV valve? Looked in the egr pipe (there is a thread of videos on how to do that)? How cold was it in your neck of the woods today?

Keep us posted.

 

Sounds like your Prius has lived an eventful life.

How long ago was the dear strike and where did it hit? Drivers from and just hit the pump behind the headlight assembly or go into the engine side and potentially get the egr system? Who did the repair and what did they replace? Any possibility they might have not gotten it all and missed something? Or pics are worth a thousand words if you have them.

We'll get to the middle of the onion eventually .

 

Can you take a video of the sound? How loud is it? Could you hear it in the car, or only when outside?

If this happened after a drive, this does not sound like the rattle on startup issue.

If it sounds more metallic, it could be a motor mount, or something that has worked its way loose. Could be when the car was reassembled after repairs something may have not been torqued down correctly.

Hope that helps.

 

Have you done the transmission drain and refill? If so, how long ago? If not, might be a good idea to do if you suspect something with the MG's.

If the sound only appears when the ICE is running, have you pulled the egr pipe and what does the deposit level look like? Depending on the quality of gas run, you might have some buildup in there.

Keep us posted.

 

I see you haven't been back on the forum for a while. There is a recall that deals with engine stumbling and knocking at start up. It is something that the dealer needs to hear to confirm the problem. I think it has something to do with the intake manifold.

 

I experienced some rattling/knocking sound before and it took me a few weeks to find out the type of petrol used: of different octane level.
I suggest to use a higher octane fuel. I don't experience ever since I use premium fuel (higher octane).

 

We have two Prius', both 2010's. Both have the dreaded engine knock once in a while. It appears that when stored for a long period of time (in our case six months) it sometimes knocks on the initial start up. Also, if the ICE starts but is turned off before it automatically turns off (such as moving the vehicle a short distance), the engine will sometimes knock on the next start up.

 

Dear Slicer89, Yaesu has a perfect reply I think.

"We have two Prius', both 2010's. Both have the dreaded engine knock once in a while. It appears that when stored for a long period of time (in our case six months) it sometimes knocks on the initial start up. Also, if the ICE starts but is turned off before it automatically turns off (such as moving the vehicle a short distance), the engine will sometimes knock on the next start up."

I have noted the same thing with my 2010. I can typically reproduce the knock at startup consistently by letting the ICE start after the vehicle has been sitting for at least a couple of hours, move the vehicle a short distance(in my case back out of the garage), then turn off the car before the ICE turns off automatically. The engine will then make the knocking noise on the next startup if you let it sit for an hour or so.
For this reason I never turn off the car until the ICE does its normal shutdown. Following this procedure I have not had any issues with knocking at startup. My understanding is the issue is related to condensation in the EGR system getting sucked into the engine causing a small amount of hydrolocking. There is a TSB out for a re-designed of the intake manifold. I am at 200K miles so well out of warranty. Since I know what I need to do to prevent the issue, I am not concerned with living with the issue.