metallic sound

woodga16 · 10-12-2011, 09:13 PM

On cold starts I get a loud metallic raspy sound. Goes away during any revving or once the motor heats up...any ideas? Sounds like something rattling in the piping?

NiVeDh · 10-12-2011, 09:15 PM

Wastegate rattle.

tibra1 · 10-12-2011, 09:17 PM

I was thinking wastegate too..but wouldnt that sound persist even when the car is hot..

woodga16 · 10-12-2011, 09:19 PM

^and that's what I'm thinking...it goes away once it's up to normal running temp.

shootfirst83 · 10-12-2011, 09:21 PM

Is the sounds coming from the front or rear of your car? I had the same problem and it turned out to be the butterfly valve in the muffler.

woodga16 · 10-12-2011, 09:23 PM

^that could be it...heard some people had these problems. It sounds like it's coming from a little past mid section of car. Hard to tell exactly where it's coming from.

tibra1 · 10-12-2011, 09:24 PM

Woodga,,i suspect its exhaust related... clamps, v/band clamps..try to slide under the car when u first start it up and have a listen which direction its coming from.

woodga16 · 10-12-2011, 09:27 PM

it started after I put my raceland dps on...they didn't fix exact, but made them work...I'll check it out. Thanks

tibra1 · 10-12-2011, 09:30 PM

Quote:

Originally Posted by woodga16

it started after I put my raceland dps on...they didn't fix exact, but made them work...I'll check it out. Thanks

HA>.im not taking the bait..

///M3THOD · 10-12-2011, 09:31 PM

Quote:

Originally Posted by woodga16

it started after I put my raceland dps on...they didn't fix exact, but made them work...I'll check it out. Thanks

Check your clearance between the DP's.

I had a clearance issue with my AE exhaust and the supporting bracket that sits underneath it. It would occasionally vibrate on cold starts. I would put the car up, let it sit overnight and crank it in the morning. You'll sort it out really quickly.

Quote:

Originally Posted by tibra1

HA>.im not taking the bait..

..lol

woodga16 · 10-12-2011, 09:34 PM

Quote:

Originally Posted by tibra1

HA>.im not taking the bait..

I was referring to since I went ***less dps I could hear the already existing problem. I also have my butterfly valve always open so that could be it. Not trying to say I'm unhappy with the raceland pipes.

secretsquirrel · 10-12-2011, 09:38 PM

DPs make wastegate rattle more pronounced. My money is on them.

tibra1 · 10-12-2011, 09:38 PM

Quote:

Originally Posted by woodga16

I was referring to since I went ***less dps I could hear the already existing problem. I also have my butterfly valve always open so that could be it. Not trying to say I'm unhappy with the raceland pipes.

Ok.. its no secret on this forum how I feel about RLs..

I will just add that I have gone to a couple of car meets..w guys running RLs and complaining of some noise w them..like Meth said hopefully u can sort it out.

woodga16 · 10-12-2011, 09:45 PM

I will probably go a different dp route when funds allow, but wedding costs priorities took car funds out the door at the moment

woodga16 · 10-12-2011, 10:01 PM

//M3THOD, I have to disregard anything you say now that I see your an Alabama fan ha ha JK. The tide kicked our a$$, and LSU...not looking good for auburn either seeing we're on our 3rd string qb...anyways, back to garage talk. I pull for all the SEC teams when we're not playing them. I went to UF...not just a fanboy. Thanks again for all the help...I'll do a follow up soon.

///M3THOD · 10-12-2011, 10:19 PM

Quote:

Originally Posted by woodga16

//M3THOD, I have to disregard anything you say now that I see your an Alabama fan ha ha JK. The tide kicked our a$$, and LSU...not looking good for auburn either seeing we're on our 3rd string qb...anyways, back to garage talk. I pull for all the SEC teams when we're not playing them. I went to UF...not just a fanboy. Thanks again for all the help...I'll do a follow up soon.

I went to Bama as well.

GL sorting it out.

thebigragu99 · 10-13-2011, 12:13 AM

Quote:

Originally Posted by woodga16

On cold starts I get a loud metallic raspy sound. Goes away during any revving or once the motor heats up...any ideas? Sounds like something rattling in the piping?

This is normal ,it's the secondary pump activating for cold starts and warming up the the cats up .The sound is more pronounced due to the catless downpipes,it normal don't worry car is fine!

Syndicategt · 10-13-2011, 11:57 AM

Here's another option to check out. Visually inspect the bolt and the W shaped clamp that holds the exhaust in place. It's located just after the downpipes on the passanger side of the car. My bolt loosened up over time and was rattling very bad (metallic sound) on cold starts.

If you had wastegate issues, you would hear it on accel and deccel .... not just idle.

stratos_335 · 10-13-2011, 12:29 PM

did you check the rear exhaust heat shield?

10-12-2011, 09:13 PM	#1
woodga16 First Lieutenant 16 Rep 378 Posts Drives: BMW 335i Join Date: Mar 2011 Location: US iTrader: (0)	metallic sound On cold starts I get a loud metallic raspy sound. Goes away during any revving or once the motor heats up...any ideas? Sounds like something rattling in the piping?
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10-12-2011, 09:15 PM	#2
NiVeDh Major General 422 Rep 8,003 Posts Drives: '08 E90 335i, '99 E36 M3 Join Date: Apr 2009 Location: Houston, TX & Atlanta, GA iTrader: (132) Garage List 2008 BMW 335i Sedan [8.66]	Wastegate rattle.
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10-12-2011, 09:17 PM	#3
tibra1 Banned 129 Rep 6,773 Posts Drives: 2011 ZCP M3 - 2007 335i crashd Join Date: Apr 2009 Location: NYC iTrader: (4)	I was thinking wastegate too..but wouldnt that sound persist even when the car is hot..
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10-12-2011, 09:19 PM	#4
woodga16 First Lieutenant 16 Rep 378 Posts Drives: BMW 335i Join Date: Mar 2011 Location: US iTrader: (0)	^and that's what I'm thinking...it goes away once it's up to normal running temp.
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10-12-2011, 09:21 PM	#5
shootfirst83 Enlisted Member 2 Rep 43 Posts Drives: Blindfolded Join Date: Jun 2011 Location: US iTrader: (0)	Is the sounds coming from the front or rear of your car? I had the same problem and it turned out to be the butterfly valve in the muffler.
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10-12-2011, 09:23 PM	#6
woodga16 First Lieutenant 16 Rep 378 Posts Drives: BMW 335i Join Date: Mar 2011 Location: US iTrader: (0)	^that could be it...heard some people had these problems. It sounds like it's coming from a little past mid section of car. Hard to tell exactly where it's coming from.
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10-12-2011, 09:24 PM	#7
tibra1 Banned 129 Rep 6,773 Posts Drives: 2011 ZCP M3 - 2007 335i crashd Join Date: Apr 2009 Location: NYC iTrader: (4)	Woodga,,i suspect its exhaust related... clamps, v/band clamps..try to slide under the car when u first start it up and have a listen which direction its coming from.
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10-12-2011, 09:27 PM	#8
woodga16 First Lieutenant 16 Rep 378 Posts Drives: BMW 335i Join Date: Mar 2011 Location: US iTrader: (0)	it started after I put my raceland dps on...they didn't fix exact, but made them work...I'll check it out. Thanks
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10-12-2011, 09:38 PM	#12
secretsquirrel Colonel 130 Rep 2,291 Posts Drives: f80 Join Date: Dec 2010 Location: Far North Dallas iTrader: (2)	DPs make wastegate rattle more pronounced. My money is on them.
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10-12-2011, 09:45 PM	#14
woodga16 First Lieutenant 16 Rep 378 Posts Drives: BMW 335i Join Date: Mar 2011 Location: US iTrader: (0)	I will probably go a different dp route when funds allow, but wedding costs priorities took car funds out the door at the moment
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10-12-2011, 10:01 PM	#15
woodga16 First Lieutenant 16 Rep 378 Posts Drives: BMW 335i Join Date: Mar 2011 Location: US iTrader: (0)	//M3THOD, I have to disregard anything you say now that I see your an Alabama fan ha ha JK. The tide kicked our a$$, and LSU...not looking good for auburn either seeing we're on our 3rd string qb...anyways, back to garage talk. I pull for all the SEC teams when we're not playing them. I went to UF...not just a fanboy. Thanks again for all the help...I'll do a follow up soon.
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10-13-2011, 11:57 AM	#18
Syndicategt Brigadier General 156 Rep 3,730 Posts Drives: 335i Join Date: Sep 2009 Location: Nor Cal iTrader: (11)	Here's another option to check out. Visually inspect the bolt and the W shaped clamp that holds the exhaust in place. It's located just after the downpipes on the passanger side of the car. My bolt loosened up over time and was rattling very bad (metallic sound) on cold starts. If you had wastegate issues, you would hear it on accel and deccel .... not just idle. __________________ 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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10-13-2011, 12:29 PM	#19
stratos_335 First Lieutenant 36 Rep 332 Posts Drives: BMW 335i Join Date: Sep 2009 Location: Greece iTrader: (0)	did you check the rear exhaust heat shield?
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