R56 Mini First (1.4) lumpy idle - 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
2006 1.4 Mini One D Idle Knocking Noise Just purchased. quemlar007 First Generation MINI One D 1 Sep 30th, 2014 01:46 PM
Mini HQ - Terrible ethics for the customer. jobforacowgirl Dealership Feedback 11 May 22nd, 2014 05:36 AM
R56 Mini Cooper Erratic surging at idle from cold start Norfolk-Mini Second Generation Faults & Fixes 6 Mar 13th, 2014 03:12 PM
Brooklands Mini Day Sunday, March 24, 2013 mab01uk Mini Events 11 Apr 5th, 2013 06:11 PM
Mini Australia service chilld Dealership Feedback 4 Sep 4th, 2012 05:29 AM

 
LinkBack Thread Tools Rate Thread
  #1 (permalink)  
Old Feb 27th, 2014, 09:31 PM
MINI2 Newbie
Offline
 
Join Date: Feb 2014
Posts: 3
Local Time: 06:22 PM
United Kingdom
R56 Mini First (1.4) lumpy idle

My wife has a 59 plate Mini First which had elevated HC readings at the last MOT, but the re-test just scraped under 200 ppm.

Her Mini has started idling lumpily (~650 - 700 rpm) and sounding a little raspy at low revs (< 2500).

I stuck my OBD cable on this evening and the o2 sensor seemed to be reading < 1v which seems a little low to me, I was expecting >= 1.5v (see attached*)

After reading h t t p://w w w.mini2.com/forum/second-generation-faults-fixes/206833-mini-failed-emissions-test-second-time.html I'm tempted to get some cleaner for the cat, but are my o2 readings out of whack or am I miss-reading them?

(*columns are: PID, sensor, current reading, units, min, avg, max)
Attached Thumbnails
Click image for larger version

Name:	Screen Shot 2014-02-27 at 22.05.45.png
Views:	36
Size:	32.8 KB
ID:	169954  
Reply With Quote
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old Mar 5th, 2014, 01:15 AM
MINI2 Newbie
Offline
 
Join Date: Mar 2014
Posts: 1
Local Time: 06:22 PM
United Kingdom
United-Kingdom

Had a similar problem with our 2007 1.4 R56 70k miles which seems to be fixed now.

There were no OBD fault codes but we had a lumpy idle and slight hunting up and down with a flat spot at 2k-3k rpm and CO and HC emissions were both above MOT test limits.

It was time for a service so it had an oil change with new oil, air and fuel filters and a new set of plugs - which did not improve things.

We checked for an unmetered air intake leakage. Nothing found.

Next the throttle body was given a thorough internal clean. RESULT! - the CO reading reduced by 75% and HC's by 60%, well inside the MOT requirement.
It idles much better now and the flat spot disappeared.

I hope this helps with your problem.
Reply With Quote
Thanks for this post from:
  #3 (permalink)  
Old Mar 16th, 2014, 04:42 PM
MINI2 Newbie
Offline
 
Join Date: Feb 2014
Posts: 3
Local Time: 06:22 PM
United Kingdom
Update

Thanks for the advice

Finally got a good enough day with some spare time to have a spanner...

Replaced the air-filter and went for a run out; the car ran less lumpily, but ended up with a P1111A being thrown, so I think I need to clean the lambda sensor (and the throttle body while I'm doing it) and see if that makes things better
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
2006 1.4 Mini One D Idle Knocking Noise Just purchased. quemlar007 First Generation MINI One D 1 Sep 30th, 2014 01:46 PM
Mini HQ - Terrible ethics for the customer. jobforacowgirl Dealership Feedback 11 May 22nd, 2014 05:36 AM
R56 Mini Cooper Erratic surging at idle from cold start Norfolk-Mini Second Generation Faults & Fixes 6 Mar 13th, 2014 03:12 PM
Brooklands Mini Day Sunday, March 24, 2013 mab01uk Mini Events 11 Apr 5th, 2013 06:11 PM
Mini Australia service chilld Dealership Feedback 4 Sep 4th, 2012 05:29 AM

» Recent Threads
PAS Fluid Leak HELP!!
Oct 15th, 2014 07:16 PM
Last post by JollyRotten
Today 06:14 PM
6 Replies, 447 Views
LED Side Lights
Oct 16th, 2014 10:34 PM
Last post by mab01uk
Today 05:49 PM
4 Replies, 405 Views
Build up of rain water...
Today 05:15 PM
Last post by chris0074
Today 05:15 PM
0 Replies, 21 Views
UK Big Brake fitment, what to do?
Yesterday 01:44 PM
Last post by ihughes
Today 03:55 PM
1 Replies, 206 Views
Rear wiper motor stem problem
Oct 18th, 2014 09:57 AM
Last post by ihughes
Today 03:48 PM
2 Replies, 301 Views
2001 Cooper wheel nut key
Yesterday 05:05 PM
Last post by ihughes
Today 03:35 PM
2 Replies, 240 Views
Strange Noise
Oct 16th, 2014 10:28 PM
Last post by CCroker
Today 02:20 PM
2 Replies, 255 Views
Mini Cooper with Helicopter Turbine Jet Engine
Feb 29th, 2012 05:36 PM
by mab01uk
Last post by Aliraza852
Today 12:10 PM
5 Replies, 1,420 Views
Lights on warning not working
Today 11:42 AM
by S2dicky
Last post by S2dicky
Today 11:42 AM
0 Replies, 82 Views
JCW intercooler intake grille.
Oct 19th, 2014 08:06 PM
Last post by The Nun
Today 08:31 AM
3 Replies, 316 Views
New iPhone update messed up blue tooth, anyone else?!
Yesterday 02:35 PM
Last post by BeccaRoberts04
Today 07:37 AM
3 Replies, 236 Views
Automatic transmission - settle a bet!
Oct 18th, 2014 06:05 PM
Last post by whaap
Yesterday 11:49 PM
8 Replies, 570 Views
A pillar exterior trim Mini Cooper D 2011
Yesterday 06:49 PM
Last post by daniel_couch
Yesterday 06:49 PM
0 Replies, 191 Views
Mini One r56 engine rattle
Yesterday 06:41 PM
Last post by In Reverse
Yesterday 06:41 PM
0 Replies, 383 Views
R56 Aux input volume???????
Yesterday 04:00 PM
Last post by peteski2014
Yesterday 04:00 PM
0 Replies, 189 Views
engine fan on more frequently
Oct 16th, 2014 01:46 PM
Last post by heathwebbo
Yesterday 03:31 PM
2 Replies, 413 Views
Ac compressor
Yesterday 12:40 PM
by ronny
Last post by ronny
Yesterday 12:40 PM
0 Replies, 195 Views
MINI Roadster Headed to Frankfurt Auto Show?
May 19th, 2009 02:32 PM
Last post by angel10
Yesterday 09:02 AM
3 Replies, 4,138 Views
» Premium
» Auto Insurance
Wheel & Tire Center

Powered by vBadvanced CMPS v3.2.1

All times are GMT. The time now is 06:22 PM.



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