My mini has a #1 cylinder misfire which is erratic but happens at idle. I have replaced spark plugs, wires and coil pack which all had no affect. The car does not have any kind code read other than Misfire. Please help thank you.

 

Its probably time for a compression and cylinder leak down test.

 

Next step is likely a compression check....then a bit more work...doing it wet/dry or maybe a leakdown to determine if you have a possible valve issue or low compression....things that few folks can diy unless they have done quite a bit with cars. About the only other diy thing...and it is borderline for some and a bit of a long shoot, is moving a fuel injector for that cylinder ( with new o-rings) and seeing if the misife follows the moved part.
Burnt valves are kinda common....folks use lower octane gas than required....

 

Both sound like a trip to the garage. That sucks but thanks fellows

 

Good thing is the stuff you swapped out on a 2004 was likely due for replacement! Good luck!! Be sure to post what you find....sometimes it can really help the next guy!!

 

Wish you good luck with whatever you find!!

 

Swap injectors between cyl 1 and another. Clear code, and see if it moves with the injector. If so, there's your answer.

 

Let me go into a little more detail about when I said erratic I meant that I can drive 100 miles at times and then come to a light and I get the misfire or it could be 3 miles and it happens but not every time i go to idle. some times it doesn't happen for a couple days then it happens multiple times in 15 minutes there is no reason for when it might misfire. I hate chasing ghost.