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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 05-02-2015, 04:39 PM
M-sport 325 M-sport 325 is offline
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Location: Qld Australia
 
Join Date: May 2015
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Mein Auto: E46 325
cold start idle issue

Hi, I'm looking for ideas on where to look for a cold stat idle issue. e46 325 2003 will not idle when cold revs sit around 600-700rpm then dip to around 400 and dies. It idles fine once warm. Well maybe a tiny bit rough.
So far
-cleaned idle control unit. no change
-cleaned maf unit. no change (even when you unplug it)
-remove vanos exhaust connection. no change
-sprayed brake cleaner around the air inlets looking for a leak in there. no change
Is there a simple way to increase the idle slightly maybe 100rpm or so to see if this makes a difference? excuse my ignorance.
Any ideas where i could look next/ check would be much appreciated. I'm running out of ideas.

Thanks in advance.
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  #2  
Old 05-05-2015, 05:28 AM
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ahull ahull is offline
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Location: Carolina
 
Join Date: Apr 2006
Posts: 4,235
Mein Auto: ist schnell! (03 330i SC)
You need an advanced programming tool to up the rpms. Could be your throttle body. Hard to say.
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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 05-18-2015, 02:24 PM
M-sport 325 M-sport 325 is offline
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Location: Qld Australia
 
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Posts: 4
Mein Auto: E46 325
I found the problem and it was the ccv or oil pressure regulator. Problem solved, replaced the pressure veleif vale and it runs like a dream again.
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Old 05-21-2015, 04:34 AM
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ahull ahull is offline
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Location: Carolina
 
Join Date: Apr 2006
Posts: 4,235
Mein Auto: ist schnell! (03 330i SC)
Quote:
Originally Posted by M-sport 325 View Post
I found the problem and it was the ccv or oil pressure regulator. Problem solved, replaced the pressure veleif vale and it runs like a dream again.


Glad you got it figured out and thanks for the update. The CCV can cause running problems when it clogs although the typical symptoms are different than yours. But, another reason to replace it preventively somewhere up around 80-120k miles, depending on climate, oil change frequency, length of commutes, etc.
__________________
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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