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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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Old 04-06-2013, 03:38 PM
kz1911 kz1911 is offline
Registered User
Location: houma
Join Date: Aug 2012
Posts: 50
Mein Auto: 325i
rough idle and shutting off on cold start 03 325i

car shuts off on cold start, i disconnect the mass air sensor and starts fine, reconnect sensor runs ok but then slowly develops a rough idle
I am at this point about to pull my hair out, i have done the following:
CCV revamp
O2 sensors revamp.....sometimes i still get the O2 sensor codes, not sure why
vacuum lines revamp

what i think it could be:
old gasoline....car has been sitting for a while and gas might be old, i did add some new but perhaps mixture is bad
air leak maybe? ccv and vaccum lines were done but not sure

some suggestions ive seen:
bad fuel filter, dying fuel pump

if anyone knows or suggest something different please let me know, im just overwhelmed right now
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