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InlineVorex InlineVorex is offline
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Posts: 10
Join Date: Sep 2021
Car: 2008 BMW 335i E90
Default BMW 335i running rough low boost. - 09-07-2021, 11:58 PM

Hi guys! I just registered on here. I'm at my wit's end with this car��

I have a 2008 BMW 335i E90

The only mods is an aftermarket charge pipe. I have had all vacuum lines replaced. New throttle body assembly unit. New water pump. New boost solenoids from Germany however I think my car runs slightly better with my old solenoids!? Intermittently my boost would come back and exhaust note would go back to being how it's supposed to sound for maybe 5 minutes before going back to being rough and no boost.

Ive had the car for 6 months and maybe two of those days I've enjoyed the car.

Funnily enough my problems stated after running 98 octane. My car has never been the same.

List of symptoms

- Car is starting to skip and vibrate when idling. Idling slightly rough. Popping from the exhaust. Almost like a misfire.

- Absolutely awful fuel economy

- exhaust note sounds raspy and God awful. Almost like a Civic with a fart can .

- Engine sounds like a bus. I can't really explain it but it sounds like it's not running on all cylinders.

- Almost zero boost. Lost all torque and incredibly slow to spool.

- Blowing white smoke randomly

- lots of black soot on my exhaust.

- Bad wastage rattle

Ive taken it to numerous mechanics. They all tell me the car isn't boosting and running rough because I need to install an X pipe on the exhaust so the turbo's flow better ��

Another mechanic acknowledged I'm severely down on power and wastegate could be stuck open.

Do you guys suggest I invest in a MHD app to check logs?

Any help would be appreciated.

Last edited by InlineVorex; 09-08-2021 at 09:55 AM..
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