Shuddering on deceleration

[yowen]

Yesterday at lower speeds while slowing down w/o braking my car was doing a bit of shuddering/shaking/hesitation, enough to where I thought "this shouldn't happen"... It does it at idle once in a while too. Has anyone experienced this?

 

[SHOdded]

Any codes set?  Misfire?  Turbo piping clamped down?

 

[DRII]

yes i have, but mainly only at idle...

i have a 2010 MKS EB.  i first noticed it after having the SP534 plugs installed; it doesn't happen often but i have noticed it.  i had someone run deep diagnostics on the engine.  he said everything passed.  there was one cylinder that was closer to the limit but was less than 4% off of where it should be, so the guy told me it really wasn't necessary to do anything.  in the future i'll probably get a new coil pack for that cylinder's spark plug or wait until an engine code actually comes up and the extended warranty will cover it (thats already happened once).

 

[yowen]

Any codes set?  Misfire?  Turbo piping clamped down?

Nope, no codes. Maybe 6 months ago I got an O2 sensor code, but it went away and never came back.

Not sure of the current state of turbo piping...

 

[yowen]

yes i have, but mainly only at idle...

i have a 2010 MKS EB.  i first noticed it after having the SP534 plugs installed; it doesn't happen often but i have noticed it.  i had someone run deep diagnostics on the engine.  he said everything passed.  there was one cylinder that was closer to the limit but was less than 4% off of where it should be, so the guy told me it really wasn't necessary to do anything.  in the future i'll probably get a new coil pack for that cylinder's spark plug or wait until an engine code actually comes up and the extended warranty will cover it (thats already happened once).

Interesting, I am about to put 534's in and get a tune, but this scared me a little bit.

 

[Spartn27]

Have you had the transmission check valve TSB done? It is a simple fix for an annoying problem.

 

[yowen]

That could be the problem... I do have an early 2010 model and it's entirely possible no TSB's got performed on it.

 

[elund126]

It could be normal. I don't have my owner's manual with me, but, in one of the chapters, it talks about how the car will feel like it is braking when you let off the gas. Apparently it is a gas saving feature. I don't like the feel and have never got used to it.