Hey Guys, Obviously just joined the site 'cause I'm at a cross-roads and wanted some advice from anyone that's experienced the mis-fire codes and still had trouble after replacing the spark plugs and coil packs.

I was going to attack the intake/valves to make sure they're nice and shiny then I was thinking..... PCV system maybe...?

Any help would be great. By the way, it's a 2012 Countryman 'S'... blue ('cause someone will think that matters).

In advance, thank you SO much for any guidance.

-Trevor

Ok, wrong section my bad... I can't figure out how to delete this post though. Can someone please move it? Thanks and apologies

 

What codes exactly and how many miles on the car. Some have replaced coils with non OEM and still had issues. Other misfires are often caused by a bad High Pressure Fuel Pump in the MINI. Exactly what my problem was. I had misfire codes and a HPFP code. Some HPFPs are covered under an extended 10 year warranty. Run the VIN # by the dealer if that is a possible solution.

 

I have the same problem today. 2013 countryman S. Engine light came on, low power, #2 cylinder miss fire. I wanted to see if it was the coil pack or spark plug. so i swap them to other ones. Still get #2 miss fire. Then i unplug #2 while engine running and nothing change. But all the other ones when I unplug, engine idle changes. Is it possible my #2 connector broke?

 

 

 

Get battery tested if you have any question. Minis do NOT like a flakey battery. All kinds of screwy things will have you chasing your tail. Typically free at a local parts place.

 

 

 

Problem solved. I had a bad coil pack for #2. started car after i installed brand new spark plugs. Then while car running disconnected coil pack one by one. With #2 disconnected, the engine didn't do anything. turn off car pulled #2 spark plug and it was still nice and shiny. Went to NAPA got a new coil pack. Installed. Car runs like normal now. 3 weeks ago I had to change the thermostat housing. Feel like after I hit the 97k things started going bad for this car. Thank you guys for the help. I hope this helps others too.

 

Thanks for all the replies guys, I've been so busy I totally forgot to check back. Okay, so I had already put new plugs in (ngk laser iridium 95770) and got new coil packs in there before my original post so those should be good.

I'll test the battery and see what I can find there. Codes would be the P0300, 0301, 0303, 0304, 0442, 0455 - so your standard mis-fire codes along with a side of Emissions codes.

Something to note... well let me preface by saying this is the first time I've touched this vehicle and the most recent repair was about 6 months ago when the dealership replaced the turbo - but when the car first started running rough about 10 days ago, I took a peek under the hood to see if anything was obvious and the O2 sensor off the turbo was completely loose. Like wiggle back and forth loose so I naturally thought 'Bingo! Problem solved'. Sadly that just seemed to make things worse.

Anyway, I've got the intake off and the next step was going to be cleaning the valves out.

 

 

Well the valves look pretty filthy from what I can see with my endoscope... I have no idea how the hell i'm supposed to clean them though but it looks like it'd be easier to pop the head off rather than trying to shove my fingers into the valve ports with paper towels.

I was surprised at how 'black' the spark plugs came out just from about 30 seconds of running the engine before shutting it down. Plugs were dry, though.