07-up MINI Cooper/Cooper S (R56)
Sponsored by:
Sponsored by:

Intermittent Misfire

  #1  
Old 04-11-2015, 07:01 PM
Junior Member
Thread Starter
Join Date: Apr 2015
Posts: 1
Default Intermittent Misfire

My Mini has a problem, and I don't know how to narrow it down. I'm driving an 08 Cooper S JCW package. I've owned it for about a year and a half, and she has ~60k miles. I don't know how much of a difference the JCW package makes here, but figured I'd mention it. I'm getting an intermittent misfire issue, and a sound/mechanical issue. The codes indicate that the misfire is not with a specific cylinder, and suggest that it could be anything from an ignition issue to a vacuum issue. There are no codes for anything other than the misfire. I have recently changed the plugs and cables with manufacturer recommended.

The problem might actually be two problems, but I'm not sure. When I start the car, and this does not happen every time I start it, I get two things happening. First there is a rattle, like an old, noisy diesel starting. Then the engine diesels like it is a big V8 with a crack in the distributor. The RPMs repeatedly drops below 500, and if I press the accelerator the RPMs drop before going up. That alone says vacuum leak to me. If I actually get on the road at all the rattle continues, but invariably stops abruptly within 5 minutes after the motor warms up a bit, and the car drives like normal, and the CEL goes away. On some occasions the rattle stops and the car drives like normal, but there is no turbo boost.

My problem is that I am not close enough to a shop that can look at it, or even listen to it, before the problem stops. In addition, my situation with transportation is such that I cannot leave it at a mechanic overnight in hopes that it will act up for the mechanic. I fear that this is the beginning of a head gasket problem, a turbo problem, or a timing belt problem. If anyone has had similar a experience, I would appreciate any input.
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
SageSkaggs
07-up MINI Cooper/Cooper S (R56)
0
02-27-2014 09:08 AM
coopy56
2002-2006 Mini Cooper S (R53)
9
11-22-2011 09:56 PM
JimMigliaccio
General Tech
1
10-11-2011 08:36 PM
ShewbodMini
General Tech
4
02-11-2011 06:11 AM
lisalevi
General Tech
0
03-28-2009 11:39 AM


Thread Tools
Search this Thread
Quick Reply: Intermittent Misfire


Advertising
Featured Sponsors
Vendor Directory

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.