Rattle at cold startup..maybe not wastegate?

gizmo335i · 08-02-2011, 05:27 AM

I read through most of the wastegate rattle threads and I know this is common. And I know there are fixes that sometimes work.

But everything I read it seemed people get this rattle when driving? Or am I mistaken about that?

When I start my car when completely cold, there's a rattle right away that lasts about 5 seconds. It just started. It only happens then at idle.

Is it possible it's something else?

samchoi604 · 08-02-2011, 05:39 AM

Could be the valve in the exhaust. Do the actuator unplug DIY and see if you still hear the rattle. If you do, then it's not the exhaust valve.

gizmo335i · 08-02-2011, 06:08 AM

Quote:

Originally Posted by samchoi604

Could be the valve in the exhaust. Do the actuator unplug DIY and see if you still hear the rattle. If you do, then it's not the exhaust valve.

Would that apply even if I don't have the OEM exhaust anymore?

Zasquatch · 08-02-2011, 07:12 AM

I find that there is a whole orchestra of different rattles, buzzes, and various other noises for the first ~90 seconds after a cold start. Once the RPMs settle to idle, the only audible noises are the pure sex coming from the exhaust and the rediculous ticking of the injectors.

Randomaccess335 · 08-02-2011, 07:30 AM

Yeah I get a shit ton of noises on cold start up, after a few seconds it nothing but what you paid for

C4sF80M3 · 08-02-2011, 10:14 AM

If you actually shine a flashlight on the turbo actuator arm you would see at initial startup that the arm is in the "open" position. Continue to watch it and you will see it eventually close up and the rattle goes away. It's annoying, but that's what is going on. At least with my car.

jpsimon · 08-02-2011, 10:15 AM

I got rattle during starts (and driving) and the actuator arm tightening fixed it all

Syndicategt · 08-02-2011, 11:41 AM

I had a similar problem yesterday, a metal sounding rattle at idle. I knew exactly what it was so I put my car up on the lift and whalla, the metal exhaust support bracket came loose and was ratteling around. Try to look under your car for it while the car is idle, the location is about 1 foot down from the downpipes or directly under the shift knob. FYI, it's a 12mm bolt.

gizmo335i · 08-02-2011, 04:32 PM

Believe me...the sounds at cold start I understand...but this was a new one. It definately feels like it's coming from under the hood. And I had heard "Wastegate" rattle so many times and having to get turbos replaced. I only had 3 months left on my warranty. So I'm thinking about whether I should fork out the cash to get the extended. I read a lot of threads on the wastegate and now that I'm seeing there's a fix...I'm not so worried about it..

08-02-2011, 05:27 AM	#1
gizmo335i Colonel 169 Rep 2,979 Posts Drives: 07 SBM E92 335i 6MT Join Date: Oct 2009 Location: New Jersey iTrader: (51) Garage List 2007 E92 335i [9.42]	Rattle at cold startup..maybe not wastegate? I read through most of the wastegate rattle threads and I know this is common. And I know there are fixes that sometimes work. But everything I read it seemed people get this rattle when driving? Or am I mistaken about that? When I start my car when completely cold, there's a rattle right away that lasts about 5 seconds. It just started. It only happens then at idle. Is it possible it's something else? __________________ In the process of restoring an 07 335i
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08-02-2011, 05:39 AM	#2
samchoi604 Colonel 64 Rep 2,334 Posts Drives: black on black Join Date: Mar 2009 Location: Burnaby, BC iTrader: (3)	Could be the valve in the exhaust. Do the actuator unplug DIY and see if you still hear the rattle. If you do, then it's not the exhaust valve.
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08-02-2011, 07:12 AM	#4
Zasquatch Captain 36 Rep 708 Posts Drives: '07 BMW 335i Join Date: Sep 2010 Location: CT iTrader: (15) Garage List 2007 BMW 335i [0.00]	I find that there is a whole orchestra of different rattles, buzzes, and various other noises for the first ~90 seconds after a cold start. Once the RPMs settle to idle, the only audible noises are the pure sex coming from the exhaust and the rediculous ticking of the injectors.
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08-02-2011, 07:30 AM	#5
Randomaccess335 Captain 70 Rep 868 Posts Drives: 07' 335I Join Date: Mar 2011 Location: boynton beach, Fl iTrader: (11)	Yeah I get a shit ton of noises on cold start up, after a few seconds it nothing but what you paid for __________________ JB4 G5 ISO , AR DP's, DO Meth kit Trunk Mount, ETS 5" Intercooler, M6 Rims, ER Charge Pipe, Fordged DV's, MMp relocated inlets, Ebay 4" chrome Tips, Lux Angel Eyes ********11.910 @ 117.091.851 60'*********
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08-02-2011, 10:14 AM	#6
C4sF80M3 First Lieutenant 26 Rep 303 Posts Drives: 17 F80 M3 ZCP Join Date: Oct 2010 Location: Raleigh, NC iTrader: (0)	If you actually shine a flashlight on the turbo actuator arm you would see at initial startup that the arm is in the "open" position. Continue to watch it and you will see it eventually close up and the rattle goes away. It's annoying, but that's what is going on. At least with my car.
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08-02-2011, 10:15 AM	#7
jpsimon Team Zissou 3154 Rep 10,200 Posts Drives: 2022 AWD M3 Comp - SMB Join Date: Dec 2006 Location: CT iTrader: (7)	I got rattle during starts (and driving) and the actuator arm tightening fixed it all
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08-02-2011, 11:41 AM	#8
Syndicategt Brigadier General 164 Rep 3,730 Posts Drives: 335i Join Date: Sep 2009 Location: Nor Cal iTrader: (11)	I had a similar problem yesterday, a metal sounding rattle at idle. I knew exactly what it was so I put my car up on the lift and whalla, the metal exhaust support bracket came loose and was ratteling around. Try to look under your car for it while the car is idle, the location is about 1 foot down from the downpipes or directly under the shift knob. FYI, it's a 12mm bolt. __________________ 2008 BMW 335i e90 - Sold - Rob Beck Turbos / PROcede V5 / Aquamist HFS-4 / AR Downpipes / AE Exhaust / ER Comp FMIC / ER CP / TiAL BOV / Custom Intake / RPI Scoops / Quaife LSD / Swift-Koni Coilovers / DSS HS / Morr VS8.2 Sig Black / Michelin PSS / P3 Boost Guage / M3 body / M3 steering wheel / Adam's Rotors / Hawk HPS / SS lines /
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08-02-2011, 04:32 PM	#9
gizmo335i Colonel 169 Rep 2,979 Posts Drives: 07 SBM E92 335i 6MT Join Date: Oct 2009 Location: New Jersey iTrader: (51) Garage List 2007 E92 335i [9.42]	Believe me...the sounds at cold start I understand...but this was a new one. It definately feels like it's coming from under the hood. And I had heard "Wastegate" rattle so many times and having to get turbos replaced. I only had 3 months left on my warranty. So I'm thinking about whether I should fork out the cash to get the extended. I read a lot of threads on the wastegate and now that I'm seeing there's a fix...I'm not so worried about it.. __________________ In the process of restoring an 07 335i
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