2009 Mini Cooper S Misfire

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.

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.....

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

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

my 2013 mini hardtop had just under 88k miles and i have replaced spark plugs twice! the symptom was misfiring particularly under load (up hill). but i feel ya...the repairs are ridic. prob gonna trade mine on a dif car real soon.

I own 4 mini coopers. Had the same problems with the codes, changed the temp sensor and all codes went away. That was the cause of the rough running, stalling, shifting problems too. The temp sensor tells most of the cars modules a lot of info to take proper readings of the engine. Also the frist thing you will notice is the engine fan will start running as soon as you start the engine and run after engine is shut down.

One more thing I would like to comment on, The mini cooper 4 cylinder engines don't have timing belts, only timing chains. A lot of problems are caused by poor maintaince.

2009 Mini Cooper non turbo. Built an engine for the car. New rings, pistons, valves, Timing chain and gears... Started right up but gave codes. Two were due to plugs not on all the way. After first oil change I reset all codes but continued to get random Misfire on #2. Swap plugs 2 to 3. Misfire moved to #4. Pulled #4 and it moved to #2. Reset and drove, Misfire on #2 and #3. All this time I have temp sensor code. After reading this I have order a new sensor for water temp to try it. If it fixes it I'll try to follow up on this.

I have a 2011 MINI Cooper non turbo with 130k miles with misfires on all cylinders. Multiple trouble codes. Several mechanics could not figure out the problem. NOT HAPPY. The MINI dealer found the oil air separator to be dumping to much oil into the intake system which consequently kept fouling the Ignition coils and spark plugs causing the misfires. $1500 diagnosis and repair bill. A quick internet search shows this is a common problem and is a simple fix by installing an aftermarket oil catch can system.

@guru - Catch can is a myth. The reality is that these Mini engineers have designed a car that requires it's mechanics to service it in order to increase dealer profits. Keep reading... The skinny is that it is the oil that you run that causes the oil in the airbox. And also causes the oil seeping around the valve cover. Conventional and synthetic blend oils will "NOT!!!" work in these cars. PERIOD. I had the same issue and was told the same thing. And I thought the same thing about oil, "No way! I don't need to burn the expensive stuff." Until I tried it. I cleaned every cavity I could in the air intake. Installed a new air filter. I ran the proper synthetic oils and changed religiously for six months, and my problem with oil in the air filter went away. I also changed plugs annually and noticed they stopped fouling as well. I changed to premium fuel only. And I Seafoam the intake to help break down the carbon that has built up. There is something specific in the viscosity difference of the synthetic oil recommended by MINI, as opposed to a convention or synthetic blend. When in use, one vaporizes into a lighter droplet, allowing the oil to be carried into the air box. The MINI specified oil does not do this particular science experiment inside the MINI engine. I am not saying go to the dealer for oil, just make sure that what is used is the exact same specs. Our 2011 Cooper would drink a quart between changes as we drove 75-80 mph up and down the interstates of the Nebraska wasteland. And temp sensor is a great idea. I changed ours once and WOW! How can something so minor have such an impact? You know, the German engineers are laughing at all of us right now?!?!? "Vatch this Frederick. Silly cheap Americans buy little expensive car! AH HAHAHAHA!" "Vee really showed them, huh?"

P.S. Our jet skis had 1.8l four cylinders with 180 hp and very specific maintenance requirements. Annual maintenance required new plugs and oil. I just applied the same logic to the smaller and less powerful motor of the Mini, and my problems cleared up.

hello i have problems with myself mini S 2008 me aparece el code 277D COMBUSTION MISFIRES CYLINDER 2