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BMW 3-Series (E90 E92) Forum
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Intake noise question,( do I have an issue)
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05-23-2019, 04:44 PM | #1 |
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Intake noise question,( do I have an issue)
Hello
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 Thanks, Matt |
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