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Well... and that's what really happened... Murphy's law...
I went to the dealer and they borrow me the tool, a nut with two rubber inserts that expands inside the tubes to gain the right grip to get them out with the help of a lever.
Obviously, as soon as the rubber expanded, the previous cracked tubes collapsed and the result is to have some plastic pieces going around the engine. Ok, not so big pieces that can cause major fault so I decided to leave them there and pick them up at next oil change when I will get the oil pan down.
Anyway, tubes replaced, spark plugs replaced (original beru with NGK brk6ek). Starting up the engine, with my surprise, the engine still misfiring between idle and 2000 rpm. Diagnosys shows cyl 1 misfiring with some random other cylinders but in less number. If I push down the throttle when the engine is within 1000 and 2000 rpm, misfiring is unaccetptable and if I keep throttle down, the CEL goes on (first blinking than solid). If I gently push the throttle misfiring issue is not present.
After 2000 rpm, engine is clear, powerful and no problems are shown.
What could have gone wrong with the engine after a spark plug replacement? Coils seems to be ok, I also changed them position but misfiring still remain at cyl 1. None of those issues were present prior the maintenance. Any idea???
Thanks
Marco
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