R50/R53 :: Hatch Talk (2002-2006) Cooper (R50) and Cooper S (R53) hatchback discussion.

R50/53 Cylinder 3 still misfiring

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Old Oct 13, 2020 | 05:13 PM
  #1  
GreenMiniEthan's Avatar
GreenMiniEthan
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Cylinder 3 still misfiring

My check engine light and stability control light came on because of a misfire on cylinder 3. I have replaced the fuel injector, spark plug and wires and nothing has been fixed. Does anyone know what I should try next?
 
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Old Oct 13, 2020 | 05:33 PM
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JAB 67's Avatar
JAB 67
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Check the cylinder 3 contact point on the coil pack. As I recall it is prone to corrosion which can cause misfire. If corroded, replace the pack.
 
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Old Oct 13, 2020 | 05:39 PM
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Thanks for the tip. Will do that soon and then update.
 
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Old Oct 14, 2020 | 06:28 AM
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Originally Posted by JAB 67
Check the cylinder 3 contact point on the coil pack. As I recall it is prone to corrosion which can cause misfire. If corroded, replace the pack.
That is interesting... I just cleaned that contact point on the MSD coil I have... wonder why it is on the #3 plug...
 
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Old Oct 14, 2020 | 11:03 AM
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MVPeters
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One of life's MINI mysteries - it's always the #3 contact that corrodes - nobody knows why!
A little dielectric grease will help.
 
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Old Oct 14, 2020 | 12:21 PM
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Originally Posted by MVPeters
One of life's MINI mysteries - it's always the #3 contact that corrodes - nobody knows why!
A little dielectric grease will help.
Wow that is bizarre... wonder if its firing order related...
 
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Old Oct 14, 2020 | 12:24 PM
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nd-photo.nl
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Yep, I also read about this. Was able to find this picture:



https://www.northamericanmotoring.co...ium-plugs.html
 
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Old Oct 15, 2020 | 05:36 PM
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I inspected the plugs and found that they both look clean. In the picture below is the contact points on the coil pack. The one on the right is for cylinder 3 (the bad cylinder)

 
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Old Oct 15, 2020 | 11:46 PM
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nd-photo.nl
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That looks quite alright. You are missing the heatshield on the engine side?

I think the only way to move forward is to try another coil
 
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