[Scrippy]

So I bought my 07 335i with 38,000 on it. Love this car! It's my first car in general. It's made me a huge fan of BMW and DTM lol! I was an offroad SCORE truck guy prior. I'm learning a lot here from everybody and you guys are awesome. I cannot keep replacing parts to figure this out but I can't troubleshot any further. So I have wastegate rattle on low RPM engine deceleration. Sounds like the front turbo too! It's extremely prevalent on cold start up. I've replaced all Vacuum lines in the entire system. I also removed the vacuum line for the exhaust flap in the engine bay just after the start of the system and caped it. I have verified my 25Hg at the top of the tanks. Today I placed a T inline between the wastegate actuator and the output of the boost solenoid and ran a gauge into my car through the window. As I drove there was no measure of vacuum until I aggressively pushed on the pedal. When I did that the Hg" value changed and ultimately caused the gauge to flicker around 6Hg. It would hit 23-25 then collapse to 6Hg" and spaz out (flicker). When I say flicker, I mean it oscillated kinda like it was the two solenoids cycling as they do......Or my solenoids allow the boost of vacuum and then leak\fail? I don't know enough yet and I don't know if this is normal. I did this T method for both actuator lines off of their prospective solenoid outputs. I know the two outputs are bridged together but I was looking for a reason as to why only one wastegate appears to rattle. Any help would be appreciated.

[Epic404]

Do you have jb4? I had a bad wastegate rattle until I installed it.

[joeyt]

I would say that sound like its either failed control solenoid/s or possibly a failed wastegate actuator.

[tjobeid]

keep us updated. Im in the same boat as you and did all that, i just gave up. only time i minimal rattle is if i put menu 10 on 2k rpm on the jb4, but that lags the sh!T out of the car. Any other setting it rattles like a kid and a frying pan.

Try finding a friend with a n54 and just swap solenoids for a few minutes and drive the car around.

[sankohuy]

Correct me if I'm missing something here, but, couldn't you bring it into the dealer and have them replace your turbos? It's covered up to 8 yrs/80,000 miles.

[Scrippy]

Originally Posted by joeyt

I would say that sound like its either failed control solenoid/s or possibly a failed wastegate actuator.

That's where I'm leaning. I think it's a solenoid too.

[Scrippy]

Originally Posted by Epic404

Do you have jb4? I had a bad wastegate rattle until I installed it.

No I don't, I'm completely stock. How does the JB4 correct wastegate rattle? It changes the default state of the wastegate probably huh?

[Scrippy]

Originally Posted by sankohuy

Correct me if I'm missing something here, but, couldn't you bring it into the dealer and have them replace your turbos? It's covered up to 8 yrs/80,000 miles.

The car has 138,000 on it. To be honest with you I'm extremely let down by the dealerships. They all (4) just want to replace turbos for $4,000. None of the dealers I contacted will touch the actuators. If I put new turbos on, I'll do it my damn self with some RB Turbos. I will not let the stealerships crappy techs f#ck up my baby. Just found that I paid for all my fluids to be changed and they didn't even replace my radiator hoses. When I was doing my vacuum lines the overflow line from the radiator blew up because it was brittle. My waster pump failed after they did their shitty service too. Which cost me $2500 for a new water pump and thermostat......AND THEY STILL DISNT CHANGE MY HOSES. If you guys know a good HONEST dealership in the SoCali area let me know. Beverly Hills, Valencia , center and Crevier have all extremely let me down!!!

[Seanpatio]

Charlie at McKenna of Norwalk is legendary in the SoCal area. You said 38k then 138k witch is it? If you are 138k those snails are fried. Jb4 will help but if you've got the money pick up some RB's.