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 02:46 PM
Mini HQ - Terrible ethics for the customer. jobforacowgirl Dealership Feedback 11 May 22nd, 2014 06:36 AM
R56 Mini Cooper Erratic surging at idle from cold start Norfolk-Mini Second Generation Faults & Fixes 6 Mar 13th, 2014 04:12 PM
Brooklands Mini Day Sunday, March 24, 2013 mab01uk Mini Events 11 Apr 5th, 2013 07:11 PM
Mini Australia service chilld Dealership Feedback 4 Sep 4th, 2012 06:29 AM

 
LinkBack Thread Tools Rate Thread
  #1 (permalink)  
Old Feb 27th, 2014, 10:31 PM
MINI2 Newbie
Offline
 
Join Date: Feb 2014
Posts: 3
Local Time: 04:31 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:	42
Size:	32.8 KB
ID:	169954  
Reply With Quote
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old Mar 5th, 2014, 02:15 AM
MINI2 Newbie
Offline
 
Join Date: Mar 2014
Posts: 1
Local Time: 04:31 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, 05:42 PM
MINI2 Newbie
Offline
 
Join Date: Feb 2014
Posts: 3
Local Time: 04:31 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 02:46 PM
Mini HQ - Terrible ethics for the customer. jobforacowgirl Dealership Feedback 11 May 22nd, 2014 06:36 AM
R56 Mini Cooper Erratic surging at idle from cold start Norfolk-Mini Second Generation Faults & Fixes 6 Mar 13th, 2014 04:12 PM
Brooklands Mini Day Sunday, March 24, 2013 mab01uk Mini Events 11 Apr 5th, 2013 07:11 PM
Mini Australia service chilld Dealership Feedback 4 Sep 4th, 2012 06:29 AM

» Recent Threads
Anyone know what this knob does?
Today 12:19 PM
Last post by TomEdwards
Today 12:19 PM
0 Replies, 80 Views
R56 MCS JCW cooling system problem?
Nov 15th, 2014 05:11 AM
Last post by Richard of the Hills
Today 12:00 PM
1 Replies, 481 Views
How much do you pay in insurance?
Jul 24th, 2010 04:01 PM
Last post by whaap
Today 11:56 AM
89 Replies, 34,871 Views
Airbag resistor value: 3.9 Ohms ? For sure ?
Nov 21st, 2003 09:18 PM
Last post by mab01uk
Today 10:07 AM
4 Replies, 1,944 Views
Missing Functions
Yesterday 12:57 AM
Last post by SteveB00
Today 09:43 AM
9 Replies, 333 Views
Key button Door Unlock
Yesterday 06:48 PM
Last post by heathwebbo
Today 08:13 AM
1 Replies, 154 Views
engine will not start properly
Aug 12th, 2014 03:37 PM
by genik
Last post by genik
Today 06:13 AM
5 Replies, 957 Views
mini cooper 2007 won't start
Today 02:19 AM
by mc4400
Last post by mc4400
Today 02:19 AM
0 Replies, 149 Views
No power under 4000 rpm and hard start
Oct 29th, 2014 11:39 PM
Last post by scrappyloz
Today 01:41 AM
4 Replies, 768 Views
Cooper D DSC light and engine light
Yesterday 11:56 PM
by hyvrid
Last post by hyvrid
Yesterday 11:56 PM
0 Replies, 127 Views
Aux function not showing up
Yesterday 10:57 PM
Last post by nahumbruhh
Yesterday 10:57 PM
0 Replies, 125 Views
Chrome trim for 51 plate Mini Cooper
Dec 13th, 2014 12:28 PM
Last post by jessybaby96
Yesterday 10:44 PM
4 Replies, 372 Views
Xenon lights problem
Dec 16th, 2014 07:49 PM
Last post by IloveMyMini1997
Yesterday 09:16 PM
4 Replies, 452 Views
2008 mini cooper heating and fan problem
Yesterday 07:07 PM
Last post by gtsmyth23
Yesterday 07:07 PM
0 Replies, 131 Views
New MINI Cooper S Owners Roll Call.....
Nov 18th, 2006 10:20 PM
by Paul
Last post by RckStrGrl21
Dec 18th, 2014 09:59 PM
696 Replies, 171,414 Views
Does Increasing Horse Power On A Diesel 2.0 146Hp Dicrease Consumption?
Dec 16th, 2014 12:30 PM
by Bubu91
Last post by dirocyn
Dec 18th, 2014 09:43 PM
6 Replies, 395 Views
Distinct Thud under floor...
Dec 14th, 2014 07:33 AM
by stirlo
Last post by stirlo
Dec 18th, 2014 09:15 PM
3 Replies, 308 Views
Very Bad Rattle metal sound...
Dec 18th, 2014 12:50 PM
by stirlo
Last post by stirlo
Dec 18th, 2014 09:12 PM
2 Replies, 178 Views
Show me your R56 MCS and your old R53 MCS
Jul 20th, 2008 12:07 AM
by TDLC
Last post by LukaszKohut
Dec 18th, 2014 08:48 PM
18 Replies, 7,012 Views
» Premium
» Auto Insurance
Wheel & Tire Center

Powered by vBadvanced CMPS v3.2.1

All times are GMT. The time now is 04:31 PM.



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