And also I get put into Limp mode. this is occurring with more frequency,, about 4 time in the last week. Happens with a miss fire when hard acceleration.my mini is 2011 S model. Question is this? I the misfire likly to be from a plug or coil problem or a more serious issue like carbon or maybe hpfp. I can mannage the coils or/and plug issue, but beyond that i guess it wll be a trip to the dealer (about 150 miles). thanks for your thoughts

 

Mis-fire code quite often means either spark plug or coil. How many miles? Pull out the plugs and see if they are still good. You can always swap the coils and see if the code changes..

 

Yes, it's a misfire code. Good suggestion to switch the coils around and see if it follows the coil. When's the last time you did routine maintenance on the car? We have a good maintenance kit here that may be useful if it's time for these items to be done. Otherwise, if it's a bad coil you can pick up some here. Let us know what you find!

-Luccia

 

Swapped out the plugs. #3 had a bit more carbon buildup at the tip than the others. Strange part was an ultra fine thread of carbon that was bridged across the gap? New plups also studered a few times until the engine reached temp +200. Everything felt great after I got the temp up!

 

Hm, makes me think, when was the last time you did a carbon clean up? Read more about it and how to here.

-Luccia

 

Did the Sea-foam (3way,fuel, case and turbo)
right after I got the car in May

 

How many miles on the car and do you have any mods?

 

Is it acting up every time now when you start it until it gets to operating temps?

-Luccia

 

yes, now with new plugs, i am experiencing a sputter as i apply medium/heavy throttle from slow speed? less evident after warm up, but still present

 

That's not carbon cleaning. That's a placebo. (OK, not quite completely, but it's no substitute for real carbon cleaning.)

Real carbon cleaning requires pretty hard scrubbing. The walnut shells do a very good job of that, or you can get in there with picks and various instruments and scrape as much crap out as you can by hand.

If you want to verify whether or not you need the cleaning, borrow or buy a borescope. There are some pretty inexpensive ones on Amazon, among other places. Pull the intake apart and then slide it into the manifold until you get to the valves. If you're completely grossed out by what you see, you need walnut blasting.

 

+1

-Luccia

 

There's no way Seafoam can remove the heavy hard carbon on your intake valves, it requires some serious effert to remove this rock hard carbon. Walnut media would be second only to sand blasting if you could imagine.