2012 Shudder & Jerk
If you think a good mechanic is expensive, try hiring a bad one
Joined: Dec 2011
Posts: 32,017
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From: Midwest. Aiming about mid-chest
Rep Power: 517 
Thread Starter
Buckeye
Joined: Dec 2017
Posts: 31
Likes: 0
From: Northern VA
Rep Power: 0 
Re: 2012 Shudder & Jerk
Not sure how competent and knowledgeable he was (though he seemed to be), but yes. I did take him for a drive and caused the issue to appear both on surface streets and the freeway. He can back after identifying a broken engine mount...it was replaced and the issue remains.
If you think a good mechanic is expensive, try hiring a bad one
Joined: Dec 2011
Posts: 32,017
Likes: 256
From: Midwest. Aiming about mid-chest
Rep Power: 517 Re: 2012 Shudder & Jerk
Not sure how competent and knowledgeable he was (though he seemed to be), but yes. I did take him for a drive and caused the issue to appear both on surface streets and the freeway. He can back after identifying a broken engine mount...it was replaced and the issue remains.
No more 
If you think a good mechanic is expensive, try hiring a bad one
Joined: Dec 2011
Posts: 32,017
Likes: 256
From: Midwest. Aiming about mid-chest
Rep Power: 517 Thread Starter
Buckeye
Joined: Dec 2017
Posts: 31
Likes: 0
From: Northern VA
Rep Power: 0 Re: 2012 Shudder & Jerk
No codes ever appeared. Dropped the car off at a local shop. the mechanic called and said it was the COP on the #2 cylinder. When he moved it to the #1 cylinder, the problem followed. I'm assuming he has a 'super OBD' that can indicate cylinder misfires...?
Registered!!
Joined: Jan 2015
Posts: 1
Likes: 1
Rep Power: 0 
Re: 2012 Shudder & Jerk Had intermittent shudder and jerk for a few months. Car was throwing no codes and no check engine light. nothing on my scan tool.
Tried transmission drain and fill. fluid looked okay. Also changed out transmission filter. No changes.
Put in some STP fuel system cleaner. no difference.
Took it to a local foreign car mechanic.
His scan tool showed tons of misfires on bank 2 spark plug and then it would clear back to 0
He pulled the plug and the ceramic was cracked and looked to be arching.
Swapped all four plugs and replaced ignition coil on bank 2
Runs like new.
Tried transmission drain and fill. fluid looked okay. Also changed out transmission filter. No changes.
Put in some STP fuel system cleaner. no difference.
Took it to a local foreign car mechanic.
His scan tool showed tons of misfires on bank 2 spark plug and then it would clear back to 0
He pulled the plug and the ceramic was cracked and looked to be arching.
Swapped all four plugs and replaced ignition coil on bank 2
Runs like new.
