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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Mechanical Maintenance: Break-in / Oil & Fluids / Servicing / Warranty > Oil cap sucking air

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      Yesterday, 10:12 PM   #1
Drives: 325i
Join Date: Jan 2011
Location: Texas

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Oil cap sucking air

I recently had an overheating problem and Im in the process of replacing my EWP and TS. While i was checking under the hood for signs of overheating damage I removed the oil cap to check for water in the oil and noticed that after I put the cap back on ther was a hissing sound while the engine was running? Removing the cap while the engine was running caused the check engine light to come on and I cant get the hissing noise (vacume leek) to go away. This may sound like a stupid question but did I remove it incorrectly or is it normal to vent a little? The gasket looks fine BTW.
Shindog32 is offline   United_States
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