Quote:
Originally Posted by bmwx5er
The reason I mentioned valve stems is because it happened to me. I experienced the a very similar "shudder" at stop lights while idling. There were misfire codes stored. First, they found the valve cover gaskets leaking, and they were replaced, along with new spark plugs. The misfire returned two weeks later. Then they diagnosed it to be valve stem seals -- a couple of new plugs were covered in oil as well. After the valve stem seal job, the car runs fine. The shudder is now a much less pronounced occasional vibration (apparently normal - IIRC, DME is programmed to run a bit richer when idle, and the vibration is a result of the injectors working harder as a result).
Could be bad injectors too. Do you have Rheingold or the carly app? They're very handy for diagnostics.
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Thanks, going in tomorrow lets see what they say this time.