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Anyone ever dealt with a similar issue. After pushing the ignition button, there is a strange loud rattling sound coming from the engine compartment. I was able to replicate the noise on two different start ups. After a bit, the engine stabilizes with no rattling. Debating if I should run it to the dealership or tow it.
2012 CT 200 h with 105k miles on it.
 

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Check your oil level, this happened to me twice before. Both times the oil level was two quarts low. I’m just shy of 200k miles now.


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Common problem on these and the Prius.
Clean out the EGR system and run some fuel/injector cleaner through it.


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I’ve had this problem especially in cold temperatures. Either doing a oil change or cleaning out the injector has resolved it. I typically put on less than 3000 miles a year so I opt to do oil change.
 

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Your engine is on its way to throw a rod. That is what mine was doing. It threw a rod and i had to replace the engine.
There is a bad flaw with this engine design.
 

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Don’t listen to scare mongering stories like above. There are no design faults and they don’t just throw rods


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The CT uses the same engine as the Gen 3 Prius .. As with the Prius there was a service action with the intake. There is a lot of information on the Prius forums regarding the problems.

The intake is plastic and has separate pathways for the EGR system -- the pathways can become clogged with soot from the EGR system and cause various running issues. Also the intake can accumulate condensation -- this is often the knock on startup.

Most of the problems are from the EGR system. Exhaust gas is taken post cat and directed through a cooler -- this is a matrix with engine coolant surrounding the assembly -- it then goes to the EGR valve that controls the introduction of these gases through to the intake. Soot from the exhaust clogs the matrix and often gums up the valve ... in the 100k range it's often built up where it no longer flowing all that much ... eventually it will clog everything. We had a fleet of Prius and the 11's with lots of miles started to have the issues.

The fix is to clean every part of the system. In our case since we needed the cars so we could not take the time to clean the cooler and valve -- we replaced the valve and cooler. Cleaned everything else up.

As the system clogs engine performance can suffer --- also as the cooler is coated the gasses are hotter going to the heads ... eventually it stops flowing. We had oil use issues -- I surmise from the hotter gasses going to the head.

Do a few searches -- I have a long explanation in a few of the Prius forums. We had a bunch of the Gen 3's -- all gone now .. but we still have two CT's . They all had the issue -- we never had any head gasket problems ... but many do. all of our went way past 200k
 

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Teddy -- I'm afraid not. If the coolant is leaking it needs to be fixed ... if the engine is burning coolant because it getting by the head gasket ... you have to replace the gasket
 

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Anyone ever dealt with a similar issue. After pushing the ignition button, there is a strange loud rattling sound coming from the engine compartment. I was able to replicate the noise on two different start ups. After a bit, the engine stabilizes with no rattling. Debating if I should run it to the dealership or tow it.
2012 CT 200 h with 105k miles on it.
Change your plugs Right Away
as in NOW..!

Do Not let it continue to bang..

Atkinson Cycle engines allow exhaust gas blow-by with the retarded valve timing, with a plug not firing it over saturates the cylinder head with fuel, then flashes out of order with another cylinder detonating the fuel (bang bang).. Thermal Condition that heats the head unevenly, taking head gasket out and explosion pressure takes the intake gasket out..

to Replicate the issue-
Simply unplug a coil, start engine..

Replace plugs Now, and as Stormchaser said- throw a bottle of Lucas injector cleaner in the gas tank

Do Not Run Engine
Do Not Drive
 

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I have 2012 CT (just passed 80K) and the same issue as well.It seems happening more during cold weather when garage temp dropped during the night (19406). I am also seeing this happening more when engine oil had more than 8K miles on it. I had shown dealership similar video clip before, but they could not offer any solution nor giving any warranty-free repair. To me, it could be both the cold and oil life since I normally has oil change around winter. I plan on shorten the change interval (6K or 8K instead of 10K) then see if that will prevent this happen again.
 

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I have a 2013 CT200h with over 100k mileage. After the oil and filter change in 2018 it did the shudder (few days or about a week and a half later) after starting the car. Then it did that couple more times within few months. Since I did the oil change(with proper oil and filter, following the proper procedure) I got worried whether I've done some damage and whether there was a trick to the maintenance job after the oil and filter change(before starting the car). However, it did for the third time after some time of not making the violent engine shudder. I opened up the bonnet while it was doing it and realized for the first time how violent the engine shudder is. Basically it looks like only a one or two cylinders are firing while the other's not doing anything. I turned off the power and turned on again and the shudder didn't come back. It wasn't particularly cold that morning but colder than the average early Autumn day in Melbourne, Australia. So, I'm not sure about the cold weather as the cause of the noise.
I've read posts in this forum indicating the problem is in the EGR system and the intake manifold(soot and dirt buildup over time). I am about to clean up the EGR system and intake manifold as a preventative maintenance for this issue. Hopefully it will prevent the engine from possibly getting damaged because I've read few posts about head gasket or rod blowups in CT200h and Prius.
 

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I've had 3 Priuses and 1 CT200h and they have all done this on ocassion. We traded the last Prius for another one at 150K miles, my CT has 108K miles. Doesn't seem to cause an issue at all.
 
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