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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 > Intake noise question,( do I have an issue)

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      05-23-2019, 04:44 PM   #1

Drives: e92 335i
Join Date: May 2019
Location: BC,Canada

iTrader: (0)

Intake noise question,( do I have an issue)

I have a 2011 N55 335i x drive (135,000 km or so)

lately I have been getting a unusual noise at cold start (hot start this does not happen)

additionally the turbo noise seems louder than normal( have had the for a few years)

At first i though it was a bad pulley or something on the belt system(have changed the idlers and tensioner recently)

so i pulled the belt off for a cold start, same noise
at this point it was obvious it was coming from the intake(stock)

so i put my bluedriver on for a cold start and noticed there is about 20-30 grams/sec of airflow on cold start (for short time)
Q1) is this airflow at cold start normal

I also ran a scan while driving hiway home yesterday
peak boost is 181 kPa
and while normal driving long term and short term fuel trims average near zero (few percent off in general, 1 or 2 times out by maybe 10% for few seconds)
Q2), if there was a boost leak would the fuel trims show an issue?

I have no smoke from car and no codes

the only thing I changed recently was put in a fram air filter, but this noise was noticed a few weeks post filter change, don't think its related

Any ideas, or things to check, or is it nothing to worry about

Appreciate 0


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