R56 Cooper compression test help - MINI Cooper Forum

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

User Tag List

LinkBack Thread Tools Rate Thread
post #1 of 2 (permalink) Old Jun 18th, 2014, 10:59 PM Thread Starter
MINI2 Newbie
Join Date: Apr 2014
Local Time: 08:57 AM
Posts: 32
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)

United Kingdom
R56 Cooper compression test help

Hi guys still having the idle/misfire problem on the cooper tried everything,Still thinking a block / cylinder head problem or head gasket i tested the compression again today plugs removed and dry and got totally different readings from the last test..... possible as my mates guage is old i used a newish one this time around.......looks very odd....seems way too high and a differential between 2+4 any ideas anyone

CYL 1-205
CYL 2-218
CYL 3-205
CYL 4-225





pawea is offline  
Sponsored Links
post #2 of 2 (permalink) Old Jun 19th, 2014, 09:42 AM
MINI2 Newbie
Join Date: Jun 2014
Local Time: 08:57 AM
Posts: 16
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)

There's normally a 10% difference which is acceptable.
Did you use a screw-in type of tester? From the picture it looks like a push-fit type which isn't so effective. I used to warm up the engine before taking readings and keep the throttle open.
If there's a wide discrepancy in readings,then squirt some light oil into the plug hole. If compression improves,then it indicates a piston problem. If no difference,then it could be a valve problem. The Haynes manual quotes 8-12 bar with 3 bar maximum difference between cylinders.
David T-H is offline  
Sponsored Links

Quick Reply

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Rate This Thread
Rate This Thread:

Similar Threads
Thread Thread Starter Forum Replies Last Post
Difference in chassis and body R50/53 → R56, Cooper → Cooper S d-b First Generation MINI Cooper 0 Apr 12th, 2014 07:44 PM
True running costs of R56 Cooper S? cupofjavaa General Discussion 8 Nov 23rd, 2013 07:25 AM
Which diagnostic tool for R56 cooper? LizzyG Second Generation Faults & Fixes 5 Sep 30th, 2013 01:15 PM
Does r56 cooper S front bumper fit r56 cooper? irfan.s Second Generation MINI Cooper 0 Feb 14th, 2013 10:22 AM

Posting Rules  
You may post new threads
You may 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

For the best viewing experience please update your browser to Google Chrome