PROBLEM SOLVED!
EDIT 05/02/2015

Thank you JABowders and ECSTuning for your suggestion. Problem was the ignition coil.
It came first today so swapped it and car had no misfires.
Spark plug is on its way and will swap them also for maintenance.

Bought the coil pack from Amazon, Delphi GN10328 Ignition Coil

The amazon filter says it wasn't compatible with my car but the part number matched with the original parts' #. Same brand.
The tip has more rubber and fits in to the engine more snug.

Thank you once again for helping me.

-------------------------------------------------------------------------------------------------------------------------------------------------



Hi guys. I got 2009 Cooper S Convertible R57 in manual transmission. 68000 miles.

I was going around 60mph in 6th gear and then to 5th gear, the CEL came up and car was hesitating and stuttering.

I grabbed my OBD2 scanner and gave me P0302, which is Cylinder 2 Misfire and P2097, which is Post catalytic fuel trim too rich bank 1.

The car is running like its running on 3 cylinder.

About a year ago, I had fuel pump replaced.

I'm going to test by changing out my spark plugs and spark plug wires first but can't find which spark plug wires I need to buy.

Can you guys tell me which spark plug wires i should get?
Also, what would I test other than replacing spark plugs and wires?

Thank you.

 

Verified: P0302 Cylinder 2 Misfire Detected
Verified: P2097 Post catalytic converter fuel trim , bank 1 - too rich

2009 R57, has individual coil packs on your spark plugs...

Best test is clear your code, swap your Coil Pack/Spark plug (when you pull the plug inspect it - replace if bad) with Cylinder 4's... start up the car and take it for a drive if the fault follows to Cylinder 4, then you have isolated the issue. New codes should be:
P0304 Cylinder 4 Misfire Detected ... and ...
P2099 Post catalytic converter fuel trim , bank 2 - too rich

New Coil packs can run as low as $40 and as much as ... $60 example... http://www.ecstuning.com/Mini-2009-C...gine/Ignition/


Best of luck.

Motor on!

 

+1 checking the coils ( individual ) and plugs, no spark plug wire to change out, its part of the main harness. If you did the HPFP already that's the next culprit.

 

Hi guys. Thank you for your answers. I've did some testing by only swapping out the individual coil pack like JABowders said. Now its giving me P0300, P0303, P0304, P0300P, P0302P, P0303P, P0304P. I erased the code and rescanned, and the some come up, some don't. Also i think i smell gasoline when I rev up to 3000rpm and on exhaust.

Could it be something else than spark plugs/ coil? like Cat converter or O2 sensor?

 

Ouch! well... back to square 1, put everything back the way it was and re-scan... see if you get the original codes.

Just to check, when you swapped Coil packs, you did unplug them from the wiring harness, then plugged them back in for the correct cylinder, right? You didn't just pull it out and stretch it over to the next hole...

Back to returning it to the original configuration, double check you coil pack connectors and with luck you will get the first set of codes again.

Pull the spark plug and take a look at it (clean and re-gap if it look like it is still in one piece), the new multi- codes might be a combination of a bad plug and that caused the coil pack to go out, so swapping the coil pack gave you two bad firing cylinders.

Did I mention double checking your wiring harness going to your coil pack? Make sure it is undamaged.. it is the time of year when little critters like to nest in engine compartments and nibble on wires.

My thoughts are still on the ignition system plugs, coil packs, wiring harness.

Motor on!