Decel Wastegate Rattle

rborane · 10-16-2015, 12:14 PM

I am starting to notice a little wastegate rattle when I am in nuetral and rev the car to about 4k while stopped, only when the revs are coming back down.. I am also planning on buying a cobb tune or JB4 soon, will either tune help get rid of the little rattle I have, or can any pro tuner for Cobb tune it out?

Thanks!

Jaronbwall · 10-16-2015, 01:24 PM

I would start by checking all the vacuum lines (cracks, split lines) in the engine bay and check the WG solenoids.
The JB4 has a setting that can help remove the rattle, but it only helps so much. If your rattle continues you can tighten the rear WG by hand (front WG is impossible to reach).

ARDREAMS · 10-16-2015, 04:00 PM

I would take it in to the dealership to get it fix before I start modding. Cover under warranty for 8years or 82000 miles i believe.

rborane · 10-16-2015, 04:08 PM

Quote:

Originally Posted by ARDREAMS

I would take it in to the dealership to get it fix before I start modding. Cover under warranty for 8years or 82000 miles i believe.

Unfortunately already past the warranty. I guess what im trying to ask is what have people done with minor rattle only when the revs are coming down and foot is off the gas after revving the engine? It doesnt do it under load and doesnt rattle at all when revving the engine up...

Duperstar · 10-16-2015, 06:06 PM

Jb4 helps a lot. I have 130,000 miles on my turbos and they sound like rattle snakes inside of coffee cans full of pennies without the jb4. Worst on decel foot off the gas. Jb4 setting "future use D= 98 totally fixed that. I already have replacement turbos but these are still boosting with no smoke so I'm not in a huge rush. No Cobb. Go MHD if going flash only. Jb4 is worth it though.

3pointohhhh · 10-17-2015, 11:38 PM

I just tightened the waste gate actuator. It's super easy. Noise goes away.

rborane · 10-19-2015, 05:00 PM

Quote:

Originally Posted by 3pointohhhh

I just tightened the waste gate actuator. It's super easy. Noise goes away.

How many turns did you tighten? I can't remember from the DIY but do you push towards driver side to tighten or towards passenger side?

Snypa · 06-09-2016, 10:28 AM

bump. Anyone know the direction?

hoopvillian · 06-09-2016, 10:48 AM

If I remember correctly you turn it counterclockwise. Towards the passengers side tire.

10-16-2015, 12:14 PM	#1
rborane Captain 241 Rep 792 Posts Drives: BMW M4 Join Date: Mar 2013 Location: AZ iTrader: (3)	Decel Wastegate Rattle I am starting to notice a little wastegate rattle when I am in nuetral and rev the car to about 4k while stopped, only when the revs are coming back down.. I am also planning on buying a cobb tune or JB4 soon, will either tune help get rid of the little rattle I have, or can any pro tuner for Cobb tune it out? Thanks!
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10-16-2015, 01:24 PM	#2
Jaronbwall Driving cars and riding bikes really fast 285 Rep 1,002 Posts Drives: 2009 335i Join Date: Sep 2014 Location: Indianapolis iTrader: (0)	I would start by checking all the vacuum lines (cracks, split lines) in the engine bay and check the WG solenoids. The JB4 has a setting that can help remove the rattle, but it only helps so much. If your rattle continues you can tighten the rear WG by hand (front WG is impossible to reach). __________________ 335i, sport pkg, 3 pedals, Blacked out, LED markers, OZ Ultraleggera wheels, Firestone Indy 500s, x-pipe, vibrant 1792, PE mod MHD stage 2+, BMS DPs, ARM charge pipe, Tial BOV, ARM FMIC, dual cone, CSF radiator, M3 control arms, sways, HAWK pads. https://www.strava.com/athletes/8309149 Follow me on Strava
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10-16-2015, 04:00 PM	#3
ARDREAMS New Member 7 Rep 22 Posts Drives: 335i E90 Join Date: Nov 2012 Location: San Diego iTrader: (0)	I would take it in to the dealership to get it fix before I start modding. Cover under warranty for 8years or 82000 miles i believe.
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10-16-2015, 06:06 PM	#5
Duperstar Private First Class 23 Rep 113 Posts Drives: G30 540 Join Date: Aug 2012 Location: NYC iTrader: (1)	Jb4 helps a lot. I have 130,000 miles on my turbos and they sound like rattle snakes inside of coffee cans full of pennies without the jb4. Worst on decel foot off the gas. Jb4 setting "future use D= 98 totally fixed that. I already have replacement turbos but these are still boosting with no smoke so I'm not in a huge rush. No Cobb. Go MHD if going flash only. Jb4 is worth it though.
	Appreciate 0 Quote

10-17-2015, 11:38 PM	#6
3pointohhhh Second Lieutenant 14 Rep 208 Posts Drives: 2018 M550i Join Date: Mar 2014 Location: Everett, Wa iTrader: (0)	I just tightened the waste gate actuator. It's super easy. Noise goes away.
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06-09-2016, 10:28 AM	#8
Snypa Captain 37 Rep 656 Posts Drives: Like a mahdman ! Join Date: May 2013 Location: I-75 iTrader: (3)	bump. Anyone know the direction? __________________ SUPER SLOW E90
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06-09-2016, 10:48 AM	#9
hoopvillian Private First Class 21 Rep 178 Posts Drives: 335i Join Date: Apr 2010 Location: Dago iTrader: (0)	If I remember correctly you turn it counterclockwise. Towards the passengers side tire.
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