Rattling from engine when letting off throttle

FirstBMWLA · 03-28-2010, 10:50 PM

Lately been noticing some strange rattling when revving the engine and releasing the throttle while in neutral. It only happens when releasing the throttle never while applying it. I popped the hood and it definitely seems to be coming from the engine. Any ideas as to what this could be and if it's a problem?

Thanks

NiVeDh · 03-28-2010, 10:57 PM

Could be the infamous wastegate rattle.

oner · 03-28-2010, 11:32 PM

Sounds like WG rattle to me.

FirstBMWLA · 03-29-2010, 12:11 AM

Yeah, I guess I'll be making a trip to the dealer this week. What is the normal coarse of action with this issue? I had read that they first try a software update, is that right? My car is a 4/07 production I believe so it's software is probably quite old. Any danger in losing performance with the latest software out now. I know that was a big source of complaints earlier own.

I've got to make a list of everything I'm going to complain to service advisor about lol. I'm also getting the squeel when starting from stop without brakes
being applied. Also have an issue with passenger weather seal that I only discovered by taking the car up to 140mph. Finally I have the issue with driver side mirror moving to random positions. Luckily all of these issues seem to have been documented pretty well so hopefully they don't give me any trouble.

Thanks for help all

jpirelli · 03-29-2010, 12:12 AM

WG rattle seems right.

lonatic · 03-29-2010, 12:25 AM

mine is in right now for wg...

FirstBMWLA · 04-03-2010, 04:01 PM

Update:
Car is still at the dealer. Went from updating software to replacing both wastegates now they think both turbos need replacing. Just waiting on authorization from BMW NA for them.

I guess that is a good thing right, new turbos? I assume it should drive good.

cotmfk · 04-05-2010, 12:13 PM

Sounds like it worked out well for you!

euromoda84 · 04-05-2010, 12:58 PM

I got mine replaced a couple months ago. I was happy

Jed · 04-05-2010, 01:18 PM

Quote:

Originally Posted by FirstBMWLA

Update:
Car is still at the dealer. Went from updating software to replacing both wastegates now they think both turbos need replacing. Just waiting on authorization from BMW NA for them.

I guess that is a good thing right, new turbos? I assume it should drive good.

Yep. Went through exactly the same thing you did-my dealer went through all the steps until finally they replaced both turbos. And yes, it's nice to have new turbos!

FirstBMWLA · 04-05-2010, 08:43 PM

Took them 2 days to convince BMW NA it was necessary. They said they kept requesting more test data. Hopefully I'll have it back by Wednesday. That will be 1 week total.

Irishace · 04-05-2010, 08:58 PM

Were you always fully stock?

FirstBMWLA · 04-05-2010, 09:14 PM

Yes always stock. I'm the second owner of this car but previous owner wasn't even aware of tuning mods for this car so it has been stock for the 20k miles it has on it.

This is actually the second 335i I've owned. I have a JB2 from my old 335i that I'm planning to put into this car though. Anyone think it would matter if I put the JB2 in immediately or should I give the new turbos a while before putting in the JB2?

bulldog_yyc · 04-05-2010, 09:19 PM

Quote:

Originally Posted by FirstBMWLA

Yes always stock. I'm the second owner of this car but previous owner wasn't even aware of tuning mods for this car so it has been stock for the 20k miles it has on it.

This is actually the second 335i I've owned. I have a JB2 from my old 335i that I'm planning to put into this car though. Anyone think it would matter if I put the JB2 in immediately or should I give the new turbos a while before putting in the JB2?

i would wait to make sure all the issues are sorted out, then get a JB3 instead!

FirstBMWLA · 04-05-2010, 09:24 PM

Would love to have a JB3 but I bought the JB2 when they were $380 so don't really want to drop anymore money into tunes. Was gonna just install the JB2 and be happy with that. Maybe a BMS intake at some point.
Was definitely gonna make sure it's running fine but I was wondering are there any technical reasons as to why I should or shouldn't wait to put a tune on new turbos. Maybe someone that knows will chime in.

FirstBMWLA · 04-07-2010, 05:23 PM

I guess the fun never ends. They got the turbos installed and during the test drive a coolant line to one of the turbos began leaking. Of course they didn't have that part in stock so now I'm waiting till tomorrow for car. Seems like murphy's law in action here.

I thought the turbos were oil cooled. They SA said they are cooled by the coolant system.

03-28-2010, 10:50 PM	#1
FirstBMWLA Major 188 Rep 1,104 Posts Drives: 2007 335i Coupe Join Date: Oct 2007 Location: Dallas,TX iTrader: (11)	Rattling from engine when letting off throttle Lately been noticing some strange rattling when revving the engine and releasing the throttle while in neutral. It only happens when releasing the throttle never while applying it. I popped the hood and it definitely seems to be coming from the engine. Any ideas as to what this could be and if it's a problem? Thanks
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03-28-2010, 10:57 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]	Could be the infamous wastegate rattle.
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03-28-2010, 11:32 PM	#3
oner Second Lieutenant 26 Rep 214 Posts Drives: BMW Join Date: Jul 2009 Location: Earth iTrader: (0)	Sounds like WG rattle to me.
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03-29-2010, 12:11 AM	#4
FirstBMWLA Major 188 Rep 1,104 Posts Drives: 2007 335i Coupe Join Date: Oct 2007 Location: Dallas,TX iTrader: (11)	Yeah, I guess I'll be making a trip to the dealer this week. What is the normal coarse of action with this issue? I had read that they first try a software update, is that right? My car is a 4/07 production I believe so it's software is probably quite old. Any danger in losing performance with the latest software out now. I know that was a big source of complaints earlier own. I've got to make a list of everything I'm going to complain to service advisor about lol. I'm also getting the squeel when starting from stop without brakes being applied. Also have an issue with passenger weather seal that I only discovered by taking the car up to 140mph. Finally I have the issue with driver side mirror moving to random positions. Luckily all of these issues seem to have been documented pretty well so hopefully they don't give me any trouble. Thanks for help all
	Appreciate 0 Quote

03-29-2010, 12:12 AM	#5
jpirelli Power is nothing without control 34 Rep 762 Posts Drives: E90 + E92 Join Date: Apr 2009 Location: Southeast/Southwest iTrader: (3)	WG rattle seems right.
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03-29-2010, 12:25 AM	#6
lonatic Private First Class 25 Rep 110 Posts Drives: E90 M3, E36 M3 Join Date: Feb 2010 Location: NVA iTrader: (0)	mine is in right now for wg... __________________ Alpine E90 M3 Dakar E36 M3
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04-03-2010, 04:01 PM	#7
FirstBMWLA Major 188 Rep 1,104 Posts Drives: 2007 335i Coupe Join Date: Oct 2007 Location: Dallas,TX iTrader: (11)	Update: Car is still at the dealer. Went from updating software to replacing both wastegates now they think both turbos need replacing. Just waiting on authorization from BMW NA for them. I guess that is a good thing right, new turbos? I assume it should drive good.
	Appreciate 0 Quote

04-05-2010, 12:13 PM	#8
cotmfk Major General 2067 Rep 6,136 Posts Drives: M3 Join Date: Mar 2009 Location: Somewhere between DC and FL iTrader: (12)	Sounds like it worked out well for you! __________________ When you say impact instead of affect/effect, you are communicating that you don't understand the difference between the two words, and are too lazy to learn.
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04-05-2010, 12:58 PM	#9
euromoda84 Private 10 Rep 77 Posts Drives: f30 335i Join Date: Nov 2009 Location: So Cal iTrader: (0)	I got mine replaced a couple months ago. I was happy
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04-05-2010, 08:43 PM	#11
FirstBMWLA Major 188 Rep 1,104 Posts Drives: 2007 335i Coupe Join Date: Oct 2007 Location: Dallas,TX iTrader: (11)	Took them 2 days to convince BMW NA it was necessary. They said they kept requesting more test data. Hopefully I'll have it back by Wednesday. That will be 1 week total.
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04-05-2010, 08:58 PM	#12
Irishace ElevenPointFive 327 Rep 2,450 Posts Drives: E90 335 Join Date: Oct 2009 Location: Toronto iTrader: (1)	Were you always fully stock? __________________ 2008 E90 335xi - N54 Daily Driver MHD Stage 2+ ~ CPE DPs ~ BMS Intake ~ AMS FMIC
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04-05-2010, 09:14 PM	#13
FirstBMWLA Major 188 Rep 1,104 Posts Drives: 2007 335i Coupe Join Date: Oct 2007 Location: Dallas,TX iTrader: (11)	Yes always stock. I'm the second owner of this car but previous owner wasn't even aware of tuning mods for this car so it has been stock for the 20k miles it has on it. This is actually the second 335i I've owned. I have a JB2 from my old 335i that I'm planning to put into this car though. Anyone think it would matter if I put the JB2 in immediately or should I give the new turbos a while before putting in the JB2?
	Appreciate 0 Quote

04-05-2010, 09:24 PM	#15
FirstBMWLA Major 188 Rep 1,104 Posts Drives: 2007 335i Coupe Join Date: Oct 2007 Location: Dallas,TX iTrader: (11)	Would love to have a JB3 but I bought the JB2 when they were $380 so don't really want to drop anymore money into tunes. Was gonna just install the JB2 and be happy with that. Maybe a BMS intake at some point. Was definitely gonna make sure it's running fine but I was wondering are there any technical reasons as to why I should or shouldn't wait to put a tune on new turbos. Maybe someone that knows will chime in.
	Appreciate 0 Quote

04-07-2010, 05:23 PM	#16
FirstBMWLA Major 188 Rep 1,104 Posts Drives: 2007 335i Coupe Join Date: Oct 2007 Location: Dallas,TX iTrader: (11)	I guess the fun never ends. They got the turbos installed and during the test drive a coolant line to one of the turbos began leaking. Of course they didn't have that part in stock so now I'm waiting till tomorrow for car. Seems like murphy's law in action here. I thought the turbos were oil cooled. They SA said they are cooled by the coolant system.
	Appreciate 0 Quote