2009 Mini Cooper S Misfire

Asked by Jan 05, 2017 at 10:28 AM about the 2009 MINI Cooper S

Question type: Maintenance & Repair

I have a 2009 Cooper S with about 114k.  I bought it used and have had it
for 6 months or so.  This past week it started running rough with misfires.  I
had my buddy who is a car guy and builds his own run the codes.  It showed
Random Misfires, as well a specific codes for Misfires on cylinders 1, 2, 3,
and 4.  Because of this it would not seem to be the coil packs, or the plugs.  
He checked all the other numbers under the details, and they appeared to
be acceptable considering the rough running.  There is no oil in the coolant
(head gasket) and pulling the gas cap while running, there is suction.  

His worst case at the moment is that maybe the timing belt chipped a tooth
causing them to all be out of sync.  He is going to continue his research
though.  I just thought I would ask as well.  Any suggestions?
Any thoughts as to where to go from there?

8 Answers

23,195

Yes, get rid of the car. Mini Cooper cars have established a pathetic record of problems and has been proven unreliable. Again, looking good is very overrated, I'd rather feel good. Plus, it has very limited versatility, no storage space.

1 of 1 people found this helpful.
263,765

We're the spark plugs changed yet? Fouled plugs would do this. I would also suspect the timing belt needs replacing at that mileage if it wasn't already. Mark is right, used Mini's are horrible.

I replaced one of the plugs and coil packs initially, thinking that was the issue, but all cylinders are still reporting a misfire. If timing belt, I'm guessing it's better to unload for whatever I can get for it on trade rather than pay for timing belt repair? Especially since the nearest dealer is 3 hours away.....

76,235

I would think your stuck getting it to run good again before unloading it.

5

Could be your sparkplugs, try changing those and all of the coils.

Check the fuel filter, if its black start with that. you may need to pump out the fuel tank also, a bunch of sludge and dirt gets in there from somewhere. If your in CA you may need to switch to the Shell V power premium; CA waters down the gas with to much clean burning emission additives, Shell premium is the only stuff now that runs good.

I had that problem on mine, after replacing spark plugs and coils and so on with my local mechanic, I finally took the car to mini cooper and they found that the motor had been overheated, which warp the head causing oil to leak into the spark plugs chambers hense the misfires. After over $6,000 on reworking the motor head and all new spark plugs and coils never had the problem again.

The valve seats love to come loose on R56 engines and the timing chain stretches , also check the high pressure fuel pump on the engine

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