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Old 02-15-2010, 07:32 PM   #5
msb046
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Join Date: Dec 2009
Location: seattle, wa
Posts: 96
My Ride: 2001 330xi
Most likely solution - replaced the two pre-cat O2 sensors the other night and at the same time cleaned the MAF. Although it wasn't as cold this morning (about 45 degrees) absolutely no shaking/shuddering was noticed. This makes me think that it was most likely a heater in one or both of the O2 sensors that had failed, so the sensors wouldn't work properly until engine temp was high enough.
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