MISSFIRE from Carbon build-up around valves (PICTURES) - MINI Cooper Forum
Go Back   MINI Cooper Forum > MINI Technical Forums > MINI Faults & Fixes > Second Generation Faults & Fixes


Second Generation Faults & Fixes MINI faults and fixes Late 2006 - Present

Mini2.com is the premier Mini Cooper Forum on the internet. Registered Users do not see the above ads.
Reply
Similar Threads
Thread Thread Starter Forum Replies Last Post
Carbon build up on inlet valves peterhellawell Maintenance & MINI Care 19 Oct 6th, 2014 04:31 PM
How "regular" is the carbon build up? david9h Second Generation MINI Cooper S 20 Aug 12th, 2014 05:38 PM

 
LinkBack Thread Tools Rate Thread
  #1 (permalink)  
Old Feb 21st, 2010, 08:56 PM
MINI2 Regular
Offline
 
Join Date: Dec 2005
Posts: 150
Local Time: 01:44 PM
United Kingdom View Union Jacks's Classified Ads
United-Kingdom MISSFIRE from Carbon build-up around valves (PICTURES)

My car is currently undergoing decarbonisation - the dealership reckon it is a mixture of cheap fuel and driving style (I use it for Driving Instructing) that has caused it to clog up around the valves.

[IMG][/IMG]

But the thing is - this also happened on my previous engine (which was replaced under warranty due to excessive oil use) which was then cleaned under Warranty.

The first engine was decarboned at 20k miles the new engine is now on 50k miles.

Any thoughts or does it sound familiar to anything you've had?

[IMG][/IMG]
[IMG][/IMG]
[IMG][/IMG]
[IMG][/IMG]

Last edited by Union Jacks; Feb 26th, 2010 at 09:06 AM.
Reply With Quote
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old Feb 26th, 2010, 06:23 AM
sony's Avatar
It's now S power!!
Offline
 
Join Date: Apr 2008
Location: Sheffield
Posts: 563
Local Time: 12:44 PM
United Kingdom Male View sony's Pepper White & Black 2nd Gen MINI Cooper S Profile View sony's Classified Ads
I do a lot of city driving but at the weekend rev it to redline loads on country roads and I give it a good run on motorways. This has so far prevented me from having any problems.

Always ready for a MINI adventure!
Reply With Quote
  #3 (permalink)  
Old Feb 26th, 2010, 05:38 PM
MJS's Avatar
MJS
MINI2 Senior
Offline
 
Join Date: Feb 2003
Location: Lancashire
Posts: 651
Local Time: 01:44 PM
United Kingdom View MJS's Chili Red & Black 2nd Gen MINI Cooper S Profile
So what causes this build up, is it due to low revs and low speeds then?

Would higher revs and higher speeds get rid of this or once it build up does it not come off without stripping down and rebuilding?
Reply With Quote
  #4 (permalink)  
Old Feb 27th, 2010, 08:21 AM
MINI2 Regular
Offline
 
Join Date: Dec 2005
Posts: 150
Local Time: 01:44 PM
United Kingdom View Union Jacks's Classified Ads
Quote: Originally Posted by MJS (original)
So what causes this build up, is it due to low revs and low speeds then?

Would higher revs and higher speeds get rid of this or once it build up does it not come off without stripping down and rebuilding?

They said driving style (me using it for driving lessons) and low quality fuel was the cause

I guess 7 hours a day driving gently then in between that me driving flat out wasn't enough to shift any gradual build up - as you can see its "caked" on hard!!

What I don't understand is - if the fuel doesn't go through the inlet valve anymore in these GDi engines (gasolene direct injection - because its directly injected into the cylinder) how come there is a build up on the outside of the inlet valve where only air comes through?

is it maybe breathing hard and taking oil back round and that's actually the build up?
Reply With Quote
  #5 (permalink)  
Old Feb 27th, 2010, 09:20 AM
redlinepete's Avatar
MINI2 Regular
Offline
 
Join Date: Jul 2009
Location: Bridgend Wales
Posts: 241
Local Time: 01:44 PM
Wales Male View redlinepete's Classified Ads
Head

I haven't seen a coked up head like that for years.... What fuel do you use? Tesco, Shell, BP?
Reply With Quote
  #6 (permalink)  
Old Feb 27th, 2010, 09:57 AM
MINI2 Regular
Offline
 
Join Date: Dec 2005
Posts: 150
Local Time: 01:44 PM
United Kingdom View Union Jacks's Classified Ads
Quote: Originally Posted by redlinepete (original)
I haven't seen a coked up head like that for years.... What fuel do you use? Tesco, Shell, BP?

Yes any petrol station or supermarket i'm nearest to - but mainly it was Tesco UL and Tesco SUL - exactly the same fuel that the MINI Dealership fill all their cars up with - although they advised me that I shouldn't use Tescos!!!!

this is the second engine that has been decoked - the first engine which was replaced under warranty at 36k miles for excessive oil use was decoked at 23k miles.

Anyway, the dealership has guaranteed me that "aslong as I only use Premium fuel from now on it will never happen again" - so that's what i'm gonna do.

do you reckon they'll give me that statement in writing?
Reply With Quote
  #7 (permalink)  
Old Feb 27th, 2010, 11:37 AM
sony's Avatar
It's now S power!!
Offline
 
Join Date: Apr 2008
Location: Sheffield
Posts: 563
Local Time: 12:44 PM
United Kingdom Male View sony's Pepper White & Black 2nd Gen MINI Cooper S Profile View sony's Classified Ads
You shouldn't have to use premium fuel though!

Always ready for a MINI adventure!
Reply With Quote
  #8 (permalink)  
Old Feb 27th, 2010, 04:49 PM
cooper1019's Avatar
cooper1019
Offline
 
Join Date: Jun 2007
Location: uk
Posts: 100
Local Time: 01:44 PM
United Kingdom Male View cooper1019's Thunder Blue & Silver 1st Gen MINI Cooper S JCW GP Profile View cooper1019's Classified Ads
decoke

Quote: Originally Posted by Union Jacks (original)
Yes any petrol station or supermarket i'm nearest to - but mainly it was Tesco UL and Tesco SUL - exactly the same fuel that the MINI Dealership fill all their cars up with - although they advised me that I shouldn't use Tescos!!!!

this is the second engine that has been decoked - the first engine which was replaced under warranty at 36k miles for excessive oil use was decoked at 23k miles.

Anyway, the dealership has guaranteed me that "aslong as I only use Premium fuel from now on it will never happen again" - so that's what i'm gonna do.

do you reckon they'll give me that statement in writing?

there is a fuel additive called BG44K on the market at the moment,and although i dont agree with these additives this one does what it says on the tin, i got a tin from kwik-fit and put it in the mrs car,it was running crap and after 150 miles the results speak for themselves,i removed a sparkplug before and after and the pistons looked like new,nice and clean and the car runs sweet as a nut,it says it lasts for 10.000 miles,it cost me £20,could be worth a try for you in the future.

Reply With Quote
  #9 (permalink)  
Old Feb 27th, 2010, 06:00 PM
MINI2 Regular
Offline
 
Join Date: Dec 2005
Posts: 150
Local Time: 01:44 PM
United Kingdom View Union Jacks's Classified Ads
Quote: Originally Posted by sony (original)
You shouldn't have to use premium fuel though!

Yup - that's why I don't reckon I'll get it in writing
Reply With Quote
  #10 (permalink)  
Old Feb 27th, 2010, 06:03 PM
MINI2 Regular
Offline
 
Join Date: Dec 2005
Posts: 150
Local Time: 01:44 PM
United Kingdom View Union Jacks's Classified Ads
Quote: Originally Posted by cooper1019 (original)
there is a fuel additive called BG44K on the market at the moment,and although i dont agree with these additives this one does what it says on the tin, i got a tin from kwik-fit and put it in the mrs car,it was running crap and after 150 miles the results speak for themselves,i removed a sparkplug before and after and the pistons looked like new,nice and clean and the car runs sweet as a nut,it says it lasts for 10.000 miles,it cost me £20,could be worth a try for you in the future.

i'm going to try just premium super unleaded from either BP (Ultimate) or Shell (V Power) first and if the problem comes back then I know i've got a legit complaint to MINI UK.

But thanks for the info cooper1019 its just infuriating when you expect a car to work straight out of the box and it doesn't so the Dealer blames you
Reply With Quote
  #11 (permalink)  
Old Mar 3rd, 2010, 10:06 PM
MINI2 Regular
Offline
 
Join Date: Jul 2007
Location: Stanwood, WA
Posts: 154
Local Time: 05:44 AM
United States Male
There's been quite a few complaints about excessive carbon build-up in the North American Motoring forums, here's a couple of long threads discussing it:

MINI COOPER :: North American Motoring - Excessive carbon build-up in engine

MINI COOPER :: North American Motoring - Maintenance :: How-To do Seafoam Treatment R55/R56

When I had the cold start rattle fixed, they mentioned I had significant build up as well, and did the cleaning as a warranty service. They didn't mention that it was related, but they also replaced the valve cover at the same time- turns out that the old version allowed excessive oil vapor through the PCV system. If I remember correctly, the newer valve cover started showing up in new builds around March 2009.

Most theories at NAM attribute the build up to the valve cover, DFI (and the lack of fuel in the intake to wash the backside of the valves) and the long time between oil changes.

Curious if your cell works with the Second Gen MINI?
See the R56 MINI Bluetooth Cell Compatibility Matrix
Reply With Quote
  #12 (permalink)  
Old Mar 3rd, 2010, 10:23 PM
Has met Quack Quack Jack
MINI One Seven
Offline
 
Join Date: Jun 2008
Posts: 4,106
Local Time: 12:44 PM
United Kingdom Male View M.O.S's Pepper White & Body Color 1st Gen MINI One Profile
Is this an r56 specific problem or is it a regular occurence on r50s?


The Original MINI One Seven
Yorkshire MINI Register - PM for details
Reply With Quote
  #13 (permalink)  
Old Mar 5th, 2010, 11:08 AM
MINI2 Regular
Offline
 
Join Date: Mar 2009
Posts: 194
Local Time: 12:44 PM
United Kingdom Male View Czar's Classified Ads
Some of the guys on NAM are right in that, the positive crankcase ventilation (pcv) valve allows this contaminated gas back into the air intake as it is designed to do, however over time this valve can become sticky and/or clogged from heat and oil degradation, this can then lead to very very fine droplets of oil finding their way into the air intake, this then settles in the intake runners and on the back of the inlet valves, with nothing to wash the intake runners and the back of the valves (fuel) then the fine oil deposits are subject to huge amounts of heat (with no fuel wash) and subsequently this then over time builds into the carbon.

Performance Powered By Thought.
Engineered Horsepower.
Reply With Quote
  #14 (permalink)  
Old Mar 23rd, 2010, 12:39 PM
MINI2 Newbie
Offline
 
Join Date: Mar 2010
Posts: 1
Local Time: 12:44 PM
England
United-Kingdom

Hi people im a newbie so please make allowances for a lack of mini knowledge but i think im right when i say that these engines are direct injection so any fuel additives or different grades of fuel will not affect the amount of carbon deposited in inlet ports or on inlet valves it will clean the cylinder and exhaust ports only
Reply With Quote
  #15 (permalink)  
Old Mar 24th, 2010, 06:59 PM
MINI2 Regular
Offline
 
Join Date: Jun 2009
Posts: 135
Local Time: 01:44 PM
View rjodwyer's Classified Ads
stop using cheap fuel! i ALWAYS use Shell Vpower
Reply With Quote
Sponsored Links
Advertisement
 
Reply
Tags: , , , , , ,



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
Carbon build up on inlet valves peterhellawell Maintenance & MINI Care 19 Oct 6th, 2014 04:31 PM
How "regular" is the carbon build up? david9h Second Generation MINI Cooper S 20 Aug 12th, 2014 05:38 PM

» Recent Threads
egr valve?
Nov 19th, 2014 09:37 PM
Last post by MiniDeLux
Today 12:19 PM
4 Replies, 390 Views
Fuel guage rising as I drive the car.
Today 12:18 PM
by t1m123
Last post by t1m123
Today 12:18 PM
0 Replies, 1 Views
heated windscreen
Nov 24th, 2014 11:19 AM
Last post by rob955triumph
Today 11:25 AM
4 Replies, 294 Views
Expansion Tank - Alternatives?
Yesterday 08:51 PM
Last post by The Nun
Today 11:24 AM
1 Replies, 87 Views
Selling cvv , fullz , track1&2, dumps , logins ÖÖ.!!!!!!
Today 11:19 AM
Last post by rich.base
Today 11:19 AM
0 Replies, 23 Views
Selling cvv , fullz , track1&2, dumps , logins ÖÖ.!!!!!!
Today 11:16 AM
Last post by rich.base
Today 11:16 AM
0 Replies, 26 Views
RS56 Cooper S Power Issues?
Nov 15th, 2014 12:18 PM
Last post by The Nun
Today 11:14 AM
5 Replies, 494 Views
Bonnet Catch not Latching
Yesterday 08:28 PM
Last post by The Nun
Today 08:36 AM
1 Replies, 111 Views
Ch4 Hollyoaks Train Crash...... (with a Mini)
Nov 23rd, 2014 02:47 PM
by mab01uk
Last post by The Nun
Today 07:50 AM
4 Replies, 321 Views
ABS,Disk Pad,Low tyre Pressure warning Lights
Yesterday 06:37 AM
by stirlo
Last post by stirlo
Yesterday 10:33 PM
5 Replies, 247 Views
04 S won't start, battery reads fine, so does alternator
Yesterday 10:02 PM
Last post by grozenblat
Yesterday 10:02 PM
0 Replies, 96 Views
Lights on warning not working
Oct 21st, 2014 12:42 PM
by S2dicky
Last post by S2dicky
Yesterday 09:22 PM
6 Replies, 973 Views
» Premium
» Auto Insurance
Ľ Wheel & Tire Center

Powered by vBadvanced CMPS v3.2.1

All times are GMT. The time now is 12:44 PM.



Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
SEO by vBSEO 3.3.2