2007 335i BLUE SMOKE PROBLEM AFTER CATLESS DOWNPIPES

TUR8OMAN · 05-24-2011, 02:16 PM

hi everyone i have 2007 335i. i loaded evotech software before then today evotech catless downpipes installed. then i go for test and figured out that blue smoke comes. it comes when i move slow(too much smoke) in average 1500-2500rpm or stop(few smoke). when i accelerate, it stops. we tried only catless downpipes installed and no other exhaust parts , it comes no smoke.service workmans dont understand anything and me too. can anyone understand the problem please explain to me. thank you.

jdbretz · 05-24-2011, 03:08 PM

If there was some sort of coating on the downpipes, it could just be that burning off. See if it still does it after a couple days. It is weird that there was no smoke with the rest of the exhaust off. It only occurs when you are driving slowly or at a stop?

TUR8OMAN · 05-24-2011, 03:14 PM

there is no coating on the downpipes. yes it comes when i stop or move slowly.

Mikes12985 · 05-24-2011, 04:29 PM

This began to happen when my stock turbos started to die out. It only got worse and now I ended up with bigger turbos.

TUR8OMAN · 05-24-2011, 04:56 PM

did your cats off the car while this happened? i fixed the smoke by installing the cats back.

Joe@TopGearSolutions · 05-24-2011, 04:58 PM

It could be the new exhaust pieces burning off but that usually goes away after some short drives.

Might be the turbo seals going?

vasillalov · 05-24-2011, 05:01 PM

Quote:

Originally Posted by TUR8OMAN

did your cats off the car while this happened? i fixed the smoke by installing the cats back.

I don't think you've fixed anything. Most probably your cats are just burning the smoke once it gets in them. This is what they are designed to do: reduce emissions.

Chances are you either have a leaking turbo seals or there is a lot of blow-by gases causing oily air to be mixed with clean air through the PCV system

Mikes12985 · 05-24-2011, 05:03 PM

Quote:

Originally Posted by TUR8OMAN

did your cats off the car while this happened? i fixed the smoke by installing the cats back.

Yes this happened when I was completely catless. I never returned the car back to stock because I upgraded the turbos which fixed it. But I had a friend of mine that had the same mods and was catless he had the same smoke we had. He returned the car back to stock (catted) with the blown turbos, had no more smoke and then traded the car back to the dealer for an M3.

Mikes12985 · 05-24-2011, 05:05 PM

Also the other two posters are correct. Its the turbo seals that begin to let oil leak out and then the oil is burned which causes the smoke you see when letting off the gas.

STONEY_M5 · 05-24-2011, 06:32 PM

i had the same problem, took it to the dealer and spent 1100 and still didnt fix the issue...

Forcefed3 · 05-24-2011, 06:33 PM

Quote:

Originally Posted by vasillalov

I don't think you've fixed anything. Most probably your cats are just burning the smoke once it gets in them. This is what they are designed to do: reduce emissions.

Chances are you either have a leaking turbo seals or there is a lot of blow-by gases causing oily air to be mixed with clean air through the PCV system

+1 replacing the cats wont fix anything.

dicostal · 05-24-2011, 06:35 PM

how can this be fixed then? only solution is new turbos?

TUR8OMAN · 05-24-2011, 07:05 PM

Quote:

Originally Posted by M335i Oreo Package

i had the same problem, took it to the dealer and spent 1100 and still didnt fix the issue...

what did you spend 1100$ for?

ScorpionT · 05-24-2011, 07:08 PM

The catalysts can remove some of the smoke from the exhaust, so likely the turbos are failing. They are most likely leaking from the CHRA or oil control rings. Your best bet is to make a trip to the dealer and have them pull the turbos.

Just an interesting bit of information for everyone, turbochargers dont have seals.

TUR8OMAN · 05-24-2011, 07:10 PM

Quote:

Originally Posted by Mikes12985

Also the other two posters are correct. Its the turbo seals that begin to let oil leak out and then the oil is burned which causes the smoke you see when letting off the gas.

can this turbos going to be fixed or do i have to replace them?

TUR8OMAN · 05-24-2011, 07:16 PM

Quote:

Originally Posted by ScorpionT

The catalysts can remove some of the smoke from the exhaust, so likely the turbos are failing. They are most likely leaking from the CHRA or oil control rings. Your best bet is to make a trip to the dealer and have them pull the turbos.

Just an interesting bit of information for everyone, turbochargers dont have seals.

can chra or oil control part change fix the leak problem?

vasillalov · 05-24-2011, 08:03 PM

Quote:

Originally Posted by TUR8OMAN

can this turbos going to be fixed or do i have to replace them?

Quote:

Originally Posted by TUR8OMAN

can chra or oil control part change fix the leak problem?

Dude,

We all told you what could be wrong! We can't possibly know for sure until someone disassembles the car and checks things out. Quit asking stupid questions! Take your car to a dealership or a private shop and have them look at it. You can't expect us to diagnose your problem with 100% certainty over the internet.

TUR8OMAN · 05-24-2011, 08:12 PM

relax man i'm just asking questions and forums for questions and solve the problem. if you dont want dont read it.

TUR8OMAN · 05-25-2011, 04:00 AM

I was talking to my service and he told me that they tried without install cat pipes and there is no smoke comes. they didn't understand exact reason of this. can anybody understand?

ScorpionT · 05-25-2011, 11:11 PM

Quote:

Originally Posted by TUR8OMAN

can chra or oil control part change fix the leak problem?

Depends on the issue. If the turbos are leaking, a basic rebuild could do the trick. That would solve a problem with the control ring or CHRA.

STONEY_M5 · 05-26-2011, 11:00 AM

Quote:

Originally Posted by TUR8OMAN

what did you spend 1100$ for?

I| had oil in my antifreeze, and a leak down and compression test..

MyE92 · 06-03-2011, 12:57 AM

Is the blue smoke coming out of both exhaust or just one side?

Pinched oil return line?

05-24-2011, 02:16 PM	#1
TUR8OMAN New Member 3 Rep 8 Posts Drives: bmw e92 335i Join Date: May 2011 Location: istanbul iTrader: (0)	2007 335i BLUE SMOKE PROBLEM AFTER CATLESS DOWNPIPES hi everyone i have 2007 335i. i loaded evotech software before then today evotech catless downpipes installed. then i go for test and figured out that blue smoke comes. it comes when i move slow(too much smoke) in average 1500-2500rpm or stop(few smoke). when i accelerate, it stops. we tried only catless downpipes installed and no other exhaust parts , it comes no smoke.service workmans dont understand anything and me too. can anyone understand the problem please explain to me. thank you.
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05-24-2011, 03:08 PM	#2
jdbretz Captain 54 Rep 923 Posts Drives: '18 X5d, '12 M3 ZCP, '12 F30 Join Date: Dec 2010 Location: FL Panhandle iTrader: (10)	If there was some sort of coating on the downpipes, it could just be that burning off. See if it still does it after a couple days. It is weird that there was no smoke with the rest of the exhaust off. It only occurs when you are driving slowly or at a stop?
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05-24-2011, 03:14 PM	#3
TUR8OMAN New Member 3 Rep 8 Posts Drives: bmw e92 335i Join Date: May 2011 Location: istanbul iTrader: (0)	there is no coating on the downpipes. yes it comes when i stop or move slowly.
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05-24-2011, 04:29 PM	#4
Mikes12985 Lieutenant 37 Rep 526 Posts Drives: X3M, 530i, X7 (on order) Join Date: Apr 2007 Location: NY (LI) iTrader: (10)	This began to happen when my stock turbos started to die out. It only got worse and now I ended up with bigger turbos.
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05-24-2011, 04:56 PM	#5
TUR8OMAN New Member 3 Rep 8 Posts Drives: bmw e92 335i Join Date: May 2011 Location: istanbul iTrader: (0)	did your cats off the car while this happened? i fixed the smoke by installing the cats back.
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05-24-2011, 04:58 PM	#6
Joe@TopGearSolutions Major 267 Rep 1,173 Posts Drives: BMW Join Date: Mar 2011 Location: USA iTrader: (3)	It could be the new exhaust pieces burning off but that usually goes away after some short drives. Might be the turbo seals going?
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05-24-2011, 05:05 PM	#9
Mikes12985 Lieutenant 37 Rep 526 Posts Drives: X3M, 530i, X7 (on order) Join Date: Apr 2007 Location: NY (LI) iTrader: (10)	Also the other two posters are correct. Its the turbo seals that begin to let oil leak out and then the oil is burned which causes the smoke you see when letting off the gas.
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05-24-2011, 06:32 PM	#10
STONEY_M5 MAAD HEAD 64 Rep 1,122 Posts Drives: 2010 X5M 2013 M5 Join Date: Jan 2010 Location: NYC iTrader: (4) Garage List 13 F10 M5 [0.00] 2010 X5M [0.00] 07 335i [9.26]	i had the same problem, took it to the dealer and spent 1100 and still didnt fix the issue... __________________ F10 M5 e70 X5M Sold E90 335i
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05-24-2011, 06:35 PM	#12
dicostal Lieutenant 55 Rep 495 Posts Drives: 2007 335i Join Date: Jun 2010 Location: Italian in CT - USA iTrader: (0)	how can this be fixed then? only solution is new turbos?
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05-24-2011, 07:08 PM	#14
ScorpionT Private First Class 6 Rep 101 Posts Drives: 335i, SL65 Join Date: Apr 2011 Location: Arctic Circle iTrader: (0)	The catalysts can remove some of the smoke from the exhaust, so likely the turbos are failing. They are most likely leaking from the CHRA or oil control rings. Your best bet is to make a trip to the dealer and have them pull the turbos. Just an interesting bit of information for everyone, turbochargers dont have seals.
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05-24-2011, 08:12 PM	#18
TUR8OMAN New Member 3 Rep 8 Posts Drives: bmw e92 335i Join Date: May 2011 Location: istanbul iTrader: (0)	relax man i'm just asking questions and forums for questions and solve the problem. if you dont want dont read it.
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05-25-2011, 04:00 AM	#19
TUR8OMAN New Member 3 Rep 8 Posts Drives: bmw e92 335i Join Date: May 2011 Location: istanbul iTrader: (0)	I was talking to my service and he told me that they tried without install cat pipes and there is no smoke comes. they didn't understand exact reason of this. can anybody understand? Last edited by TUR8OMAN; 05-25-2011 at 02:07 PM..
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06-03-2011, 12:57 AM	#22
MyE92 El Presidente 282 Rep 6,961 Posts Drives: your mom wild. Join Date: May 2007 Location: NJ iTrader: (24)	Is the blue smoke coming out of both exhaust or just one side? Pinched oil return line?
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