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Discussion Starter · #1 ·
Had a 2.5l(m54) X3 in at work with difficulty starting, engine light on and rough running at idle and when revved up, was apparent that it wasn't running on all cylinders(misfire) so read the diagnostic codes first and got these.....

DTC 2742 Cylinder 1 misfire, safety fuel shut off.

DTC 2746 Cylinder 2 misfire, safety fuel shut off.

DTC 274E Random/multiple cylinder misfire.

Cleared codes and ran car, same faults straight away again.....

Concluded that it would most likely be a coil pack problem so removed the upper engine cover and pulled number 1 and 2 coils up individually with plastic pliers while the vehicle was running to check for spark, No, there was none.....

Turned off engine and swapped coils 1 and 2 with coils 5 and 6, cleared codes then started car and read the codes, the problem moved to cylinders 5 and 6 so ordered 2 new coil packs up at customers request.

Old coils, Bremi :sarcastic, Bremi part number 11903, BMW part number 12131712223.

New coils delivered from MAIN DEALER using VIN code to establish car........
Bosch coils, part number 0221504100, BMW part number 12131712219.

Fitted coils, cleared codes started car, read codes and all fine, boxed car up and road tested :thumbsup

Advised customer to expect the other 4 to fail :D
 

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Discussion Starter · #3 ·
Ouch, sounds expensive! Good info on the differences in coil manufacturers. You are right, preventive maintenance would be to just change the rest now and beg the main dealer for a discount!
We have the same thing with Renault "pencil" coils as found on the Megane e.t.c, they go for a past time but some customers only want one fitting, we usually see them back though when the other(s) go ;)
 

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Discussion Starter · #4 ·
The X3 came back in today, misfire and engine management light back on, connected scanner and came up with misfire cylinder 2 :hihi, did the usual checks listed above and it was indeed the coil had packed up, this time the customer gave the go ahead to have the other 4 replaced, 4 new Bosch coils were delivered from the main dealers, fitted, codes cleared and then road tested, the car was fine.

Morale of the story, replace all 6 next time rofl
 
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