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Old Mar 15th, 2014, 05:17 PM
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United-States 2003 Mini Cooper s. Misfire above 3000 rpm

Hey all,
I'm looking for some help. Recently bought an R53( 2003 Mini Cooper S). I bought it knowing it had a problem but I got a killer deal on it and figured I could fix it easy. The car starts up perfect every time, runs and idles fine. But starting at about 2800-3000 rpm and up to around 4000 rpm it has a constant misfire. This happens when sitting still or under load, it gets really bad under load, to the point where I can't even make it past 3000-3500 rpm. It won't throw a code until I go drive it around and push it really hard to misfire like crazy. After that it will throw a P0301,"cyl#1 misfire". I have already done a compression text, changed spark plugs, wires, I swapped the fuel injectors to different cylinders, checked for vacuum leaks, replaced both MAP sensors. With no change. I have already ordered a new coil pack and it's on it's way. If that doesn't change anything I'm moving on to the o2 sensors and catalytic converter. I also read a technical service bulletin that says 2003 has a software error that cause misfire between 3000-4000 rpm under high loads. I'm just curious of anyone else has had this problem, and what their fix for it was.
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Old Mar 15th, 2014, 08:40 PM
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You've dne what I would of suggested. But yes O2 sensor can cause this.
Did you just change the leads? Or the coil pack itself
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Old Mar 15th, 2014, 08:43 PM
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Hi ya

I think it's your coil pack, it's a waisted spark system, if you want to check the coil pack pull the leads off the spark plugs, put a spare set of plugs in the ends of the leads spin the engine over, see which two fire at the same time then swap the leads round ie your no1 with its sister lead. Put it back together go for a drive see if the fault moves to its sister cylinder.
The coil packs do suffer from corrosion normally on the terminals for the plug leads, but I have known the coil packs to fail due to internal corrosion

Make shore the spark plugs a earthed and do not touch them

If any of the other sensors fail ie 02, map, TMAP, or cat you would end up with p0300 multiple misfire

Hope. This helps
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Old Mar 15th, 2014, 08:48 PM
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+1
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Old Mar 15th, 2014, 08:53 PM
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Ps... if you can buy an MSD coil pack, there better quality they have brass terminal and Innards, where the bmw mini one has steel and Nickel plated terminals


Hope this helps
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Old Mar 15th, 2014, 10:48 PM
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I did swap the terminals on 1 & 4(same coil) still the same problem. And yes the coil pack I ordered is the MSD one. I have a feeling this is
More of an electronic issue than a mechanical one at this point, I'm just tired
Of ordering parts with no success in fixing this damn thing, . Thanks all for the input.
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Old Mar 15th, 2014, 11:19 PM
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Hi ya

Have you had the connectors off of the DME to see if the connectors are ok.
Also check you crank shaft position sensor.

May advice is get a Bentleys manual get the one with the diagnostic section in it, this will tell you all the tests to run for voltages ect.
If you have a scan gauge or code reader does it do timing and spark advance.


Hope this helps
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Old Mar 15th, 2014, 11:24 PM
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I'm not sure what the DME is? Also I have not checked crank position sensor. Not sure where that is. I'm going to try a few more things over the next couple weeks and if that doesn't in the problem I'll check out the
Bentley manual.
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Old Mar 16th, 2014, 12:30 AM
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Hi ya

DME = engine control module = ECU, it's by your airbox sometimes the drain holes in the DME box fill up with sh"t and then the box can fill and start to corrode the DME and it's terminal, disconnect your battery before you do it or you risk a good chance off bricking it.

Crank sensor is is located on the front of the engine if follow the drip stick tube down you see it will snake over to the passengers side (uk car) it's just to the right and up a little roughly under the water pump. You might find hat the seal between the water pump and block has leaked and it has corroded the plug giving you a bad signal.
I think to get it out you have to put the mini in to service mod ie front end off it's not a big job very easy. Will find you a link

Amazon sell the Bentley manual I will try find you a link it's worth having

Hope this helps
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Old Mar 16th, 2014, 12:35 AM
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Hi ya links as promised

Just a thought I have seen the injector wiring loom chaffed and shorting out causing a misfire trace the loom have a good look at it as well

This may help locate the cps but tbh they work or don't unless it's vibration related ie bad wiring

http://www.northamericanmotoring.com...nk-sensor.html

Service manual

Mini Cooper Service Manual 2002, 2003, 2004,... Mini Cooper Service Manual 2002, 2003, 2004,...

Service mode

http://www.northamericanmotoring.com...front-end.html

http://www.northamericanmotoring.com...vice-mode.html

Hope this helps
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