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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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  #1  
Old 05-14-2011, 06:10 PM
jjtap jjtap is offline
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Location: KY
 
Join Date: Mar 2008
Posts: 13
Mein Auto: 2005 330xi
Engine Rumbling Knocking Noise 330xi

Just changed out plugs yesterday. (2005 330xi) Car really ran smoothly and quiet. Short trip today.On the way home I noticed a knocking sound. Kind of deep underneath the normal engine sound. Not sure if this is related to a simple plug change. Also changed air filter, cabin filter, spring day off activities. Is this sound something anyone can pinpoint or has experienced before. No codes or CEL. No apparent leaks or blown hoses or what not.
Here is a link to a short video. Underneath normal engine is a rhythmic thump.
Any Clues? Or ideas where to start are appreciated.
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  #2  
Old 05-16-2011, 09:00 AM
Shoalin Shoalin is offline
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Location: Wake Forest, NC
 
Join Date: Apr 2011
Posts: 271
Mein Auto: BMW 330i 2003
I wish my car was idling as well as that. Sorry, I'm no help.

I'm sure you put that silver metallic cream on the spark threads before you put the spark plugs in. I'm sure you're more experienced then I and wouldn't overlook such a thing.

When I did my spark plugs for the first time I didn't know I needed that silver cream on the threads. The auto parts person was the one who educated me on it and saved me from myself. He told me I'd have all sorts of problems if I didn't do it.

Last edited by Shoalin; 05-16-2011 at 09:07 AM.
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