1st Gen R53 Cooper S Multiple Misfire in Mid rev ...

Discussion in '1st Generation: 2002–06 R50, R53 & 2004–08 R52' started by Devrider, Jan 10, 2013.

  1. Devrider

    Devrider New Member

    Jan 10, 2013
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    Im wondering if anyone has had this problem or who can help me out. My MINI is a 2002 Mini Cooper S. Ive been having quite a few misfires (3 or 4) and my MINI seems to lag under medium acceleration (approx 3000 rpm). Ive had the head changed in the spring of 2012 due to a spark plug that flew out of the block. There are no check engines, no codes to be read. I have even tried to change different tier level gas stations (always keeping it at 91 octane) with no help at all.

    As I can recall the best, I did not have this problem before my head being changed.

    Normal acceleration it doesn't seem to hesitate, even in stop and go situations. Even when standing on the gas and going all out. Like I sais, its more around 3000 rpm.

    Has this happened to anyone or does anyone have a clue what this could be?

    Thanks alot guyz

    DEv
     
  2. Nathan

    Nathan Founder

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    Welcome, thanks for joining Motoring Alliance, the FUN and Friendly MINI Community.

    What brand plug wires?

    What brand Coil?

    When was the last time either of the above were refreshed?
     
  3. Jason Montague

    Jason Montague New Member
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    :cornut: Welcome to MA and good luck with your MINI problem.:Thumbsup:

    Jason
     
  4. minsanity

    minsanity Well-Known Member

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    Finally, you're here, DEv. Welcome to MA, the site of those who give a damn!:Thumbsup:
    How many miles do you have on the clock? Start testing the BPV by zip tying it down. If it cures it, either change the spring or go w/ the DetroitTuned BPV. Change to new OEM wires & replace your decade old fuel filter, these are maintenance items anyway. It would also be good to check your belt, tensioner damper & harmonic damper along the way. Injector cleaners like Techron, BMW Fuel System Cleaner PN:82140413341 would help if fuel & injectors are the problem, but cylinder misfires almost always throw the SES/DSC lights & show misfire codes. Do these 1 @ a time.
     
  5. rum4

    rum4 Club Coordinator
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    welcome to m/a
     
  6. Minidave

    Minidave Well-Known Member
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    If yo haven't already, try cleaning the contacts on the coil where the plug wires go, especially cylinder #3, sometimes they get corroded and can cause this.

    Let us know what you find, OK?

    BTW, just because a plug strips doesn't mean you need a new head, you can usually fix that right on the car, just FYI.
     
  7. Devrider

    Devrider New Member

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    This morning i tried to full my car with 94 ... And it seem to help ... But same thing happen first time i went to Shell ... Week after it came back ...

    DEv
     
  8. Devrider

    Devrider New Member

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    All OEM ... I own the car for almost an year so ...

    DEv
     
  9. Devrider

    Devrider New Member

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    I know, but no mechanic around here would do it ... They all scare of the after-service and warranty ... They say the spark blow inside the head before leaving the cylinder ... Cost me around 4200$ Can !!

    For the coil, i'll do that tonight ... Will get back to let you know ...

    DEv
     
  10. Metalman

    Metalman Well-Known Member
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    Welcome to M/A....

    Are you located here in the US?
     
  11. Jason Montague

    Jason Montague New Member
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    :cornut: He paid in Canadian Dollars so probably..................:Thumbsup:

    Jason
     
  12. Eric@Helix

    [email protected] New Member
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    Dev if you're running higher boost, check your plugs.
     
  13. Devrider

    Devrider New Member

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    You're right !! Canada baby !! The french section ( Quebec )

    DEv
     
  14. Devrider

    Devrider New Member

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    I have the 15% Alta pulley ...

    DEv
     
  15. CHKMINI

    CHKMINI Club Coordinator
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    I love Quebec...especially Old Quebec City:Thumbsup:
     
  16. Devrider

    Devrider New Member

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    Me too ! But i'm closer to montreal ...

    DEv
     
  17. Devrider

    Devrider New Member

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    It begin ...!! I got my first check engine tonight ... i came back from work ( 45min drive, 2/3 highway ), last redlight before home ... i accelerate normally, then 3-4 misfires and then i felt like i was running on 3 cylinders ( losing power, unequal rumble ) ... then the check engine light pop up with the traction light ( triangle with " ! " ) ...

    How to know what the code # ... Do i have to go to the dealer ?

    Thanks, i want to get this behind me ...

    DEv
     
  18. Nathan

    Nathan Founder

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    You need a code reader of some type. There are all kinds at all price points that do lots of different things.

    I'm behind the tech curve. I'm using a 2nd generation Blackberry with an app on it. Only reason I still have the phone is to read and clear codes.

    Some auto parts stores will read it for you too. Auto-Zone here in the states. Have no idea what chains in Canada may offer the same service.

    After you know the code you can look it up on the 1st Gen ECU Codes listing in the M/A Library. We'll help from there as to what it really means.
     
  19. Devrider

    Devrider New Member

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    It seem that my SC is sleeping, this morning ... I'm not able to heard it until 5000rpm ... Is it possible that the problem came from it ? When they did my head, they changed the SC oil and check if everything was ok ... And it was !!

    DEv
     
  20. MCS02

    MCS02 Moderator
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    Did they use the correct belt for the SC. With a 15% pulley it takes a shorter belt. If the belt is slipping you would lose boost, not have a miss fire.
    If you have checked your plugs, plug wires, and coil pack then you really need to hook up a OBD II code reader. This is your best bet for finding the problem.
    Good luck. Let us know what you find.
     

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