N52 exhaust pipe carbon build up

oli3 · 05-31-2017, 05:37 AM

Hi all,

I'm familiar with the N52 being a port injected engine rather than direct which means that carbon buildup on the intake is not an issue as far as I've researched. However what about the exhaust exit tail pipes?

My 325i has quite heavy carbon buildup on the exit pipes, after I clean it it comes back within a week. What are others' experience of this? Could my injectors/coils be on the way out? Spark plugs were changed around 15k miles ago according to service history and I have no engine related error codes.

Phil325i · 05-31-2017, 06:32 AM

Clogged air filter?

oli3 · 05-31-2017, 06:35 AM

Air filter was replaced Sept 2016. Could it be worth cleaning the MAF sensor?

cpie168 · 05-31-2017, 08:40 AM

I have the same thing on my exhaust tips. Is that not the way it's supposed to be?

max_330i · 05-31-2017, 09:31 AM

Quote:

Originally Posted by cpie168

I have the same thing on my exhaust tips. Is that not the way it's supposed to be?

I figured it was normal

hassmaschine · 05-31-2017, 09:33 AM

I don't think you have anything to worry about.

oli3 · 05-31-2017, 09:56 AM

I guess generally there's nothing to worry about, just wanted to hear some opinions.

hassmaschine · 05-31-2017, 09:58 AM

It's not a real problem. Every car will have a little carbon dust on the exhaust tips.

hassmaschine · 05-31-2017, 01:08 PM

^ Good god. Please ignore.

3002 tii · 05-31-2017, 01:10 PM

Quote:

Originally Posted by hassmaschine

^ Good god. Please ignore.

Not possible lol

hassmaschine · 05-31-2017, 11:53 PM

I should have quoted the post, it was too stupid to not reply. lol.

oli3 · 06-01-2017, 04:11 AM

Are you 2 serious right now? Cos if you are just Wow! Why don't you get of your high horses and pipe down a little yeh

hassmaschine · 06-01-2017, 09:30 AM

Quote:

Originally Posted by oli3

Are you 2 serious right now? Cos if you are just Wow! Why don't you get of your high horses and pipe down a little yeh

if you had been here longer you would understand.

either way - your question is answered. there's nothing to worry about having black residue on your exhaust tips. this isn't a real problem.

oli3 · 06-01-2017, 09:36 AM

Sure np

05-31-2017, 05:37 AM	#1
oli3 Private First Class 42 Rep 188 Posts Drives: BMW Join Date: Sep 2016 Location: Helsinki iTrader: (1)	N52 exhaust pipe carbon build up Hi all, I'm familiar with the N52 being a port injected engine rather than direct which means that carbon buildup on the intake is not an issue as far as I've researched. However what about the exhaust exit tail pipes? My 325i has quite heavy carbon buildup on the exit pipes, after I clean it it comes back within a week. What are others' experience of this? Could my injectors/coils be on the way out? Spark plugs were changed around 15k miles ago according to service history and I have no engine related error codes.
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05-31-2017, 06:32 AM	#2
Phil325i Brigadier General 639 Rep 3,216 Posts Drives: E92 325i MSport Coupe Join Date: Apr 2012 Location: UK South East iTrader: (1) Garage List 2009 BMW 325i Coupe [6.00]	Clogged air filter? __________________ E92 pre-LCI 325i - Ohlins R&T; H&R spacers; M3 strut brace; Swift thrust sheets; 3 x chassis braces; diff brace; N53 V-brace; 034 subframe inserts; BMS clutch stop; BMS CDV; RE g/box mounts; Delrin shift bushes; Saikoumichi OCC; Cyba scoops; BMW Perf Exhaust; HEL s/steel brake hoses; M3 rear spoiler; Recaro Sportster CSs; M3 white dash LEDs; LED Angels; LED side repeaters; BMW Perf black grille; CSL reps; SSDD carbon diffuser; Monster Wrap black roof/clear front
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05-31-2017, 06:35 AM	#3
oli3 Private First Class 42 Rep 188 Posts Drives: BMW Join Date: Sep 2016 Location: Helsinki iTrader: (1)	Air filter was replaced Sept 2016. Could it be worth cleaning the MAF sensor?
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05-31-2017, 08:40 AM	#4
cpie168 Major 173 Rep 1,117 Posts Drives: 2010 E90 328i 6MT ZSP BSM Join Date: Mar 2014 Location: K/W and GTA, Ontario, Canada iTrader: (1)	I have the same thing on my exhaust tips. Is that not the way it's supposed to be?
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05-31-2017, 09:33 AM	#6
hassmaschine Major General 3987 Rep 7,212 Posts Drives: "NBO" 330i Join Date: Jun 2014 Location: earth iTrader: (0)	I don't think you have anything to worry about.
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05-31-2017, 09:56 AM	#7
oli3 Private First Class 42 Rep 188 Posts Drives: BMW Join Date: Sep 2016 Location: Helsinki iTrader: (1)	I guess generally there's nothing to worry about, just wanted to hear some opinions.
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05-31-2017, 09:58 AM	#8
hassmaschine Major General 3987 Rep 7,212 Posts Drives: "NBO" 330i Join Date: Jun 2014 Location: earth iTrader: (0)	It's not a real problem. Every car will have a little carbon dust on the exhaust tips.
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05-31-2017, 01:08 PM	#9
hassmaschine Major General 3987 Rep 7,212 Posts Drives: "NBO" 330i Join Date: Jun 2014 Location: earth iTrader: (0)	^ Good god. Please ignore.
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05-31-2017, 11:53 PM	#11
hassmaschine Major General 3987 Rep 7,212 Posts Drives: "NBO" 330i Join Date: Jun 2014 Location: earth iTrader: (0)	I should have quoted the post, it was too stupid to not reply. lol.
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06-01-2017, 04:11 AM	#12
oli3 Private First Class 42 Rep 188 Posts Drives: BMW Join Date: Sep 2016 Location: Helsinki iTrader: (1)	Are you 2 serious right now? Cos if you are just Wow! Why don't you get of your high horses and pipe down a little yeh
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06-01-2017, 09:36 AM	#14
oli3 Private First Class 42 Rep 188 Posts Drives: BMW Join Date: Sep 2016 Location: Helsinki iTrader: (1)	Sure np
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