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

R50/53 Misfire when full throttle and low rpm

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Old Mar 30, 2019 | 10:29 PM
  #1  
Fernando Quevedo's Avatar
Fernando Quevedo
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Misfire when full throttle and low rpm

04 mcs misfires when suddenly stepping on the gas it drives perfectly the rest of the time if you slowly fully press the gas it can rev up fine but for some reason a suddenly going full throttle it'll just misfire until you let go of the gas then drive normally again
STUMPED
I get a code for random misfires
 

Last edited by Fernando Quevedo; Apr 1, 2019 at 10:02 AM.
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Old Mar 31, 2019 | 04:42 AM
  #2  
Lunatic's Avatar
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I have the same symptoms on my 07 MCS * stumped as well*
 
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Old Mar 31, 2019 | 05:57 AM
  #3  
Tgriffithjr's Avatar
Tgriffithjr
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From: Texas
When you say misfire do you mean bog down, stumble, backfire?
 
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Old Mar 31, 2019 | 11:35 PM
  #4  
MVPeters's Avatar
MVPeters
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From: Northern MA, USA
Change the spark plugs!

By the way, MINIs have little low-down torque, so you shouldn't expect much until the revs are in the 2,500-3,000 range.
It shouldn't stumble or miss (hence the new plugs suggestion), but it won't do much until the revs get up there.
 

Last edited by MVPeters; Apr 1, 2019 at 09:14 AM.
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