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My 05 C2 has 41k miles on it.  the motor was replaced sometime after 2008 based on the motor number.  It has a very pronounced shudder between 1600 and 1800 rpm, in gear or in neutral, which gets worse as the car gets warmer.

 

There are no codes or cel illuminated.

 

Thoughts are greatly appreciated!

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have you checked the cat brackets, just saying as i recently replaced the water pump and started the car without this bracket, considerable vibration, also noticed the bracket was cracked. after fitting the bracket no vibration.

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This is difficult to define without audio clip, but if the vibration noise is barely audible outside the car and well audible inside the car, are the engine mounts suspicious.

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