This is really messed up, had the same problem replaced 4 plugs, cleaned EGR, Same thing spent $500 solved nothing Clean oil, fluid levels full, no white smoke wtf 🤬

I just fixed mine today. I changed out the ignition coil. I bought one spark plug and 1 ignition coil. The check engine light say cylinder #1 misfire. I change the plug first and it didn't fix the problem. Then I changed the ignition coil and then it fix the problem. Thank you for the video.

This issue ussualy occcured in hybrid engine..especially in winter season ..When engine runs by battery carbon not burned properly.This case carbon remains in egr unit.! so engine canot ignite properly .. So this rattle sounds occurs! very simple solution ! clean the egr pipe and bulb..

Bad input Damper could be the issue as well.

2010 Prius, I pulled intake, EGR valve and cooler. Very dirty and clogged. Used a power washer and degreaser, finally re-installed all parts, like new. Take the time for this, well worth the work. Smooth throttle and gained six mpg.

The Toyota Prius has an Atkinson cycle engine. Almost nobody knows how to work on them.

one guy is selling me a Prius 2010 but per the seller, the prius started knocking & loosing power and he towed to his house, what it could be? He had 4 new ignition coils

Thank you for this excellent video. Do you mean that you changed the spark plugs ? thank you.

Good one bro👍

😂 it happens to my car as well and i was thinking the engine might fall apart😂

I have 2 year old gas and car doing that after running it for 2 days to try run out of the gas i noticed ENGINE GOT SUPER HOT is yours super hot

Mine sounded exactly like that and it was the head gasket, a rod was also bent

Hello Michael, thanks for the video it's fantastic, the problem with mine it only does it when the motor kicks in, I change the point all four, the sparkplugs are ok not that burn muy noise goes away, please help help.

What you are hearing is the clutch chattering, based on vibration from rough idle or misfire. Yes, they do have clutches. As they engage, if the engine isn't running smooth the clutch engagement will echo the vibration.

It can also be the coil packs. And for the truly unfortunate it can be a bad cylinder.

Thank you! Your instructions are easy to follow!

I change the spark plugs , and supreme gas …and it went away

Best video of this topic on utube! The video quality is the best to see all the details in all the tight areas. All the utube mechanics should follow your lead with the video works. I think you forgot to remove the masking tape on the lower exhaust gasket. Bravo nevertheless.

Mine makes that noise, but if I put it in N (neutral) it stops making the noise, does anyone know why?

It was spark plugs on my 2010. Also if you haven’t and have 100k plus miles. Change the transmission fluid. These cars have electronics in the transmission and when fluid degrades over time it can short the sensors causing very poor shifting. New fluid usually fixes the issue. It’s a specific Toyota fluid so get the right stuff!

Most time is head gasket

In the EGR cooler gasket, there's a small semi-circular notch, does the orientation make difference? Also what are your thoughts on Oil Catch Can to reduce oil build up underneath Throttle Body inside the in-take manifold? Thank you.

Thanks! Good video, very helpful 👍

Dude oven cleaner is corrosive for metal, do it again and you will spend a lot for a new EGR system, oven cleaner is used to clean burned grease from an enamel surface of the oven....your EGR IS NOT MADE FROM STAINLESS STEEL.....it has a stainless steel coating that you will remove using oven cleaner....research stuff before you tell people stupid stuff.

Thank you. This is exactly what I'm looking to do this weekend.

How difficult was it to take the cooler out? I heard it's very hard especailly taking out the hidden bolt underneath the cooler. Thank you.

did the car smell badly of gas? my mom is having the same code pop up and the car stopped accelerating when we were on the freeway, we had to pull over… & the engine started to throttle when we tried to start the car again

I just did headgasket on my 2012 ct200h. But it's misfiring and ratlling hard.not sure what happen.prior opening head there was only loss of coolant.no noise .help would be appreciated. Cleaned egr.and intake as well

The plugs are to be changed every 60 thousand miles.

The same thing happened to my car, but its only for 2 3 min

Headgasket

Thanks, i did changed the EGR, then spark plugs, then the fuel injectors and still the problem persist, 2010 prius 465000 miles.

Thank you for your video! I changed my spark plugs and it fixed my problem.

thanks very helpful

I have this same issue, took it to dealership. And had to pay for extended test ($704) to why its happening and was told after that i need a new engine

The US Army relied on trucks to keep its advancing Army supplied as it pushed its way across Europe during WW2. Any trucks that had a problem were simply pushed aside so the convoys could keep coming. 70 years ago, I knew two brothers who had been mechanics for the "Red Ball Express". Rislone and Marvel Mystery Oil were two products developed to help that are still used today. I tried the Rislone when I bought as a 2010 with 190K miles on it to replace one with 250K which had been pretty reliable. [I made a mistake!] The newer one had an EGR-relatated rattle. Rislone (a 2-part) cleaned it up and stopped the rattle. Stick with good quality gas. The additives make them different. Sunoco seems to be best. Compare the mileage you get from both. I believe the previous owner used cheap gas. The Prius is an incredible vehicle!! My "new" Prius had other problems. One caused by the dealer's Mechanic who changed the engine coolant without purging the air pockets. That had caused overheating on a long drive away from home. Purging the air pockets cured that. Be sure to use the proper coolant; don't make it worse!! I'm about to change inverter coolant for the same reason. Another chemical gem from WW2 is Marvel Mystery Oil. Still around after 85 years. Haven't tried it yet but expect it to try it as well. Additives have three purposes: Prevent corrosion, provide cooling, and reduce internal friction.

It could also be the transmission I think.. I had that problem and changed the plugs then I changed the O2 sensor downstream.. still knocking.. I was getting ready to change the upstream O2 sensor and my buddy told me check it out for first.. anyway after an hour or so we figured that it was in the transmission because when I put it in neutral it's not knocking anymore.. when I put it in drive it is knocking.. But amigo.. what country is it where a spark plug cost $125.. that is out of this world..

Head gasket 💯% You have low coolant there is lakes into the engine.. if any one have this problem fix it as soon as possible.

Very professional and competent not only in the installation but also in video-related. Thank you for your time and effort in doing this for the rest of us!

1:42 That's exactly what I thought! Ours does that very rarely. I just ordered 4 plugs for our 2012. Thanks!

when you say plug, are you referring to the spark plugs?

120$ per spark plug? Dammnnn

Thanks for the info. My 2013 has been doing this infrequently for the past couple years but only after the car has not been driven for several days, a cold start. Recently I changed the plugs using Denso OEM type. A week later on the first cool morning the rattle presented but only for 2-3 seconds. With the weather getting cooler I'm using a fuel injector additive, Tecktron, to see if that helps. I've used this additive and Lucas fuel system cleaner on other vehicles with good success. But this is the first hybrid I've ever owned and it's a different animal even though the engine is the same as other ICE. The order of remedies you suggest makes a lot of sense. So if the fuel injector cleansing doesn't help, I'll deal with the EGR. Thanks again for sharing your experience.

Good tip on not installing the nut of death.

Great video thank you! Showing which way the gaskets go back on is very helpful AND the masking tape trick for the exhaust side gasket is brilliant. Thank You 🙂💛

Ah hearing d accent trini

Yep that is my car now making that huge noise. 😭😭😭

No way it’s cleared all the way through with a can of cleaner

I change the spare tired and the noise stopped😆🤦🏻🤦🏻🤦🏻🤦🏻

Now mine start to make noise during start when car is cold