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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 04-06-2013, 04:15 PM
Shaman2002 Shaman2002 is offline
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Location: Iowa
 
Join Date: Mar 2013
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Mein Auto: 2002 330xi
Tapping @ cold start

What's up!! . Hey need a little info. I have an 02 330xi, at cold start and only on cold start I'm hearing this tapping noise at top of engine. After it warms the sound would go away. If any feedback as to what this may be I'd greatly appreciate it.. Thanks!
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  #2  
Old 04-06-2013, 04:45 PM
cvx5832 cvx5832 is offline
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Location: Walnut Creek, CA
 
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Mein Auto: 325Ci, 325Cic, C300
What oil are you using? I experienced this using some oils, but not others.
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Old 04-07-2013, 09:21 AM
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ahull ahull is online now
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Mein Auto: ist schnell! (03 330i SC)
If it's like 3 taps per second then it's probably your valve lifters making noise until they get some warm oil. Not terribly unusual. If it's more like marbles in a can, you could either have a worn/broken DISA flap (plugs into drivers side of the intake manifold) or a rattling vanos (front of engine, pistons that control intake and exhaust cam variability). Depends on where it's coming from.
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2003 330i TiAg Sport Pkg ~90k miles
DIY MODS: AA Stage I supercharger, Meyle HD FCAs w Powerflex CABs, Bilstein shocks, Meyle HD Rtabs, Angel Eyes, Clear Corners/Markers w/ LEDs, LED tails, ZHP rims, Akebono pads, AUX input
DIY E46 Merit Badges: Sunroof resurrection, CCV, OFHG, VCG w/ VANOS seals, DISA, Cooling Refresh I, steering giubo, window regs, Magnetic Infandibulator (see wiki)
DIY On deck: Rear Diff bushing. UUC SSK, clutch job eventually, Wavetrac LSD
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Old 04-07-2013, 10:19 AM
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catso catso is online now
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Mein Auto: 2000 323i, 1988 528e
I would start by changing the oil and filter.
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