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Old 04-05-2012, 06:36 AM   #16
Bobby330xi
Registered User
 
Join Date: Mar 2012
Location: Oregon Coast
Posts: 244
My Ride: '02 330 XI Auto
Almost positive its a leaking CCV hose or another vacuum leak. Good idea replacing the intake boots and air filter assembly with the OEM. Starting to sound like a parrot, but I just hit 122K and found a large hole/tear in the lower CCV oil return hose throwing intermittent codes. The car ran great and only had a very slight miss at idle on cold mornings. I used standard sized oil resistant hose (~$4) Its also a good time to replace your spark plug connectors (boots) and use dielectric grease on all contacts to prevent corrosion (better conductivity). These ignition systems put out 100K volts, so every bit of conductivity helps. There is a rather bad DIY on youtube where a kid found some pretty nasty looking connector boots on his ride.

Last edited by Bobby330xi; 04-05-2012 at 06:43 AM.
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