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Discussion Starter #1
Hi all,

My Cooper S can be a little sluggish at low revs, such as when approaching a roundabout. Not something I’ve noticed on my two F56 Coopers (though I did have those from new). Once pulling away it’s fine again, and it doesn’t happen every time but seems to be increasing the last couple of weeks. The common thing seems to be that a decoke could help it. I think it’s likely as previous two owners did short journeys and I would imagine mostly used cheap fuel. It’s 2014 with 41k miles so about now seems the time it would be affected. I do plenty of short journeys at weekends (8-15 miles) but in the week, every week, I drive 175 miles to work and then same again home, so it’s getting a real mix of driving. I always use Tesco Momentum or Shell V Power if that’s not available, but again it’s history up to 40k was likely cheap stuff.

I’ve been seeing a lot about Terraclean, costing around £100 which seems to have good write ups. A BMW/Mini specialist indie in the north east wanted £350 for a decoke! Seems a bit high that.

Any experiences on here with an F56 on this subject? Most results on my search were people with an R56 on the wrong forum!
 

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I didn't think coking was a problem with the f series but I suppose it can affect any direct injection engine. Others will know more. Seen Terraclean vans around but I would personally go for a walnut decoke if that is really what you think it is-symptoms of coking are far worse than you describe however, with hesitancy , misfiring and engine warning lights, so you might want to look at alternative solutions/issues. I could be wrong; please chip in someone! Lohen would advise perhaps? Cheap solution might be a fuel system cleaner added to the tank, and then a good old Italian tune up!!!! Seafoam or 44k seem to get decent reviews. Has it had new spark plugs/air filter etc etc.
 

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Sorry Aarn, it's an old English saying for thrash the -----out of it, drive it like you stole it etc etc!!!!!
 

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Discussion Starter #5
Thanks Jeremy, I’m going to replace the air filter with a K&N this week and I don’t think there’s any harm in seafoaming too. Could well be on original spark plugs so will replace those. Won’t do it any harm at 5 years old before I jump in to anything.
Will see what others suggest too, it is only minor symptoms but I’m noticing it and never had the hesitation on my previous F56 Coopers.
 

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Sorry Aarn, it's an old English saying for thrash the -----out of it, drive it like you stole it etc etc!!!!!
My name is Cesare.
Italian people have given a very bad impression! Something is real but the most is only a false and old reputation...as we eat pizza and pasta every day and we drink wine all day long (beer is so much better!!!)
AHAHAHAHA:ROFLMAO:
 

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The home of Ferrari, Maserati, Ducati, and the fastest of them all the Fiat 500pop (!!) Valentino Rossi Ascari Fisichella, Alboretto-there is no doubt in my mind that Italians drive cars well!
 

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Discussion Starter #13
Thanks all, you’ve saved me a few quid so far. I’ll try replacing the air filter and spark plugs and take it from there.

What is it about the F56 that makes it not a problem on these cars then?
 

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Thanks all, you’ve saved me a few quid so far. I’ll try replacing the air filter and spark plugs and take it from there.

What is it about the F56 that makes it not a problem on these cars then?
...the disaster made in previous engines! Smart people learn from mistakes (...they should!).
Probably a different design of lubricant vapours and different temperatures close to the intake valves have done the difference.
In any case BMW will not reveal the secret...
 

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yes it is, the 6 speed sport auto
OK... I once asked to the MINI salesman if the auto transmission used an automated clutch (like a DCT, but without the dual clutch), instead of a torque converter. He said no, that the auto uses a torque converter but it is programmed to simulate a clutch.

I asked him because, I noticed that when moving off, there was some sort of delay in acceleration (a brief and subtle delay), just like the one you'd get in a manual car when you release the clutch in a gently fashion. That's why I thought that maybe MINI was using an automated clutch (I recalled I had the same feeling with Audi's DSG).

My MCS is a 2017 (pre-LCI) with the 6-speed auto (not the auto sport) and has done that since new. It does it most of the time, but not all the time. It's very subtle and once it starts moving it accelerates pretty quickly (wheel-spin if I press the accelerator hard).

Could this be what you're experiencing? I think it might fit the description.

BTW, the "programmed to simulate a clutch" makes sense to me because most of the time, I also get a jolt when coming to a stop (just like a manual would do if you forget to press the clutch while breaking! it will either kick forward or stall the engine if you pressed the brake harder). I think this thread covers the jolt I'm talking about (if someone's interested) https://www.minif56.com/threads/jolt-lunge-when-breaking.49466/

I'd prefer an auto transmission programmed like an auto transmission. But for some reason MINI went with the clutch simulation (according to my salesman) thingy. I wonder if he meant a lock for the torque converter by that...

Still... I love my F56!!
 

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Discussion Starter #20
Wow thanks for the detail vicvo - appreciate you sharing that knowledge. I’ll keep an eye on the jolting as I can’t say I’ve noticed it much, but the hesitation is exactly as you describe.

The weird thing is I’ve had the car 6 weeks now and didn’t notice it for the first 4 or so, which is why I feel it’s not 100%. I’ll get the air filter and spark plugs changed and then monitor.

Interesting that other thread about transmission software resets never got a conclusion...! I wonder how much Mini charge for that on an out of warranty car too - probably eye watering!
 
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