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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Random loud exhaust periods?



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      07-23-2016, 06:14 PM   #1
madmantwo
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Random loud exhaust periods?

For the last month or so, after driving for ~15 minutes my exhaust starts droning and crackling extremely loudly. It lasts for a few minutes, and then goes away. Could this be an exhaust leak that only appears when the metal expands to a particular point, then corrects itself? This existed even before I started using the MHD exhaust gurgle option.

For some background, I have an e92 with PE mufflers, kittyless DPs, resonators in place of secondary cats. TIA
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      07-23-2016, 06:53 PM   #2
ferocity02
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Mine does this too, it's because the wastegates are opening fully and random times, WGDC goes to 0%. Monitor With MHD and watch WGDC.

I have no idea why it does this, it's annoying. Someone mentioned that it might be the DME doing a check on the O2 sensors.
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      07-23-2016, 07:05 PM   #3
madmantwo
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Quote:
Originally Posted by ferocity02 View Post
Mine does this too, it's because the wastegates are opening fully and random times, WGDC goes to 0%. Monitor With MHD and watch WGDC.

I have no idea why it does this, it's annoying. Someone mentioned that it might be the DME doing a check on the O2 sensors.
Ah yeah I was wondering about that, definitely sounds similar to when one of my wastegates got stuck open. I'll log with MHD and verify that's the issue.
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