Vacuum issue causing WG rattle, help me track down

YoungBlood · 04-09-2016, 04:46 PM

Ok, so I've developed a wastegate rattle, and tracked it down to my rear turbo, as is usually the suspect. Tried to adjust the actuator rod length, 5 full turns and 0 improvement. However, with the car started, the slop in the arm/bushing is taken up, so I'm thinking it's not that either. I think I'm possibly just not getting enough vacuum to seal the WG tight. So what to check? Is the actuator generally the culprit? Or maybe the vacuum canisters? Let me know your thoughts. Turbos are still making great power and I get 0 rattle out of the front.

Sgop335 · 04-09-2016, 05:12 PM

Fyi, wit car started depending on sw setting, solenoid closes the wg. Five turns seem excessive.

YoungBlood · 04-09-2016, 05:27 PM

Indeed, I backed it down to 2. It actually is being less noisy now, but time will tell. So I'm thinking, actuator or boost solenoid possibly? Since it comes and goes..

Sgop335 · 04-09-2016, 05:59 PM

Relatively simple to check solenoids, need a vacuum gage and a helper. Some wg rattle seems normal for old turbos, esp if boosting fine.

04-09-2016, 04:46 PM	#1
YoungBlood LongDongSilver 274 Rep 706 Posts Drives: e90 335i Join Date: Mar 2016 Location: Utah iTrader: (2)	Vacuum issue causing WG rattle, help me track down Ok, so I've developed a wastegate rattle, and tracked it down to my rear turbo, as is usually the suspect. Tried to adjust the actuator rod length, 5 full turns and 0 improvement. However, with the car started, the slop in the arm/bushing is taken up, so I'm thinking it's not that either. I think I'm possibly just not getting enough vacuum to seal the WG tight. So what to check? Is the actuator generally the culprit? Or maybe the vacuum canisters? Let me know your thoughts. Turbos are still making great power and I get 0 rattle out of the front.
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04-09-2016, 05:12 PM	#2
Sgop335 Colonel 650 Rep 2,020 Posts Drives: 07 335i e92, 08 535i Join Date: Jun 2014 Location: MD iTrader: (1)	Fyi, wit car started depending on sw setting, solenoid closes the wg. Five turns seem excessive. __________________ 335i e92 TPC 19Ts
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04-09-2016, 05:27 PM	#3
YoungBlood LongDongSilver 274 Rep 706 Posts Drives: e90 335i Join Date: Mar 2016 Location: Utah iTrader: (2)	Indeed, I backed it down to 2. It actually is being less noisy now, but time will tell. So I'm thinking, actuator or boost solenoid possibly? Since it comes and goes..
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04-09-2016, 05:59 PM	#4
Sgop335 Colonel 650 Rep 2,020 Posts Drives: 07 335i e92, 08 535i Join Date: Jun 2014 Location: MD iTrader: (1)	Relatively simple to check solenoids, need a vacuum gage and a helper. Some wg rattle seems normal for old turbos, esp if boosting fine. __________________ 335i e92 TPC 19Ts
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