Hey guys, so I bought myself an Automatic 2009 335i E92 last week. 43k Miles. The car is modded which I know better than to buy someone’s already built car rather than getting it done myself, but I did it anyway and might be eating shit for it.
The car has:
Jb4 (Set on map 1 running 92 or 93 octane)
Vanguard V2 full catback exhaust
Helix Intercooler
Dual Cone Intake w/ Cowl delete
HPFP and Injectors were supposedly replaced/upgraded at 14,000 miles from recall/warranty.
I read all the horror stories of these 335i’s prior to purchase and it damn near made me puke, but I’ve always wanted this car and went for it anyway after the glowing pre-purchase inspection, but I’ve been on edge ever since just hoping something wouldn’t go out on me at least until I’ve had the car for a couple thousand miles.
So 500-600 miles into ownership, I just got back from a spirited drive to the tire shop, just dropped $600 on some new front tires. I parked my car in my enclosed spot and let it idle for a bit since I did some aggressive driving. I blipped my throttle and noticed what sounds like a “Sucking”/kind of rattley noise on deceleration, it does the same for a moment on startup (Car is hot) reading all these stories on Wastegate rattle and failing turbos, my heart skipped a beat as soon as I heard it. I haven’t noticed this noise before, but this was the first time I blipped my throttle while backed into my enclosed parking spot which amplifies noises, but I can hear it inside the car, so I’m not sure.
So I need some help here, would this noise classify as wastegate rattle? (Video below) I haven’t had the opportunity to hear it cold start yet so I’ll try again in the morning or later tonight. I’m hoping given the fact it has an aftermarket exhaust and the lack of rattle but more emphasis on the breathing sound, it might be nothing or something less bank breaking.
On a side note, as I said I have been on edge and I’ve been having panic attacks for any little stutter/noise or whatever, I’ve been doing a lot of horror story reading as well which is having the same effect as checking WebMD for a symptom and diagnosing yourself with 4 different cancers. However this one actually seems like it might be something, I’m far more concerned about the noise, and any help at all would be much appreciated. Any tips or anything of that sort would be awesome too, I’m still learning this car and I will take any help/feedback/information that I can. These are just a few other things I’ve noticed if you care to look:
Car seems to shift a little hard sometimes, it’s kinda jerky in low gears, but from why I’ve read that might be the norm. It bogs down a little sometimes when I’m molesting the gas pedal at low speeds (I thought this might be due to DTC as the icon will flash, can’t remember if it does it with DTC completely off) I have the rixster vent boost gauge and it typically stays at anywhere from -17 to -22 psi when not in boost. It seems to boost just fine, but this is going from a 323i e46 so a prius would feel like a twin-turbo rocket in comparison.
Car has a bit of a shake when warming up in idle, I’ll start the car and the exhaust will be mad loud for about 30 seconds then it quiets down and has just the slightest shake and stutter to it, almost unnoticeable but I’ve been over examining.
The car runs hot as hell, i can see the heatwaves coming off my hood, (Seibon Vented Carbonfiber hood) from the vents mostly, but the rest of it as well. My oil temps stay 230-240 but I can’t see water temps (Is there a Jb4 setting for that?) I’m worried about the infamous electrical water pump.
Thanks again guys, and sorry for the long post.