Originally Posted by DWill

The motor is N52B. After replacing the coils I started the car and pit my finger over that barb. There was no vacuum, so I put it all back together.



The good news is the misfires are gone.



I found 2 coils with cracked boot, one with 2 cracks. All of the cracks were 1/4" or more.



Total cost, 139.00 shipped for 6 Bosch coils; the EXACT coils that were OEM in the car. I double Bosch part numbers as I pulled the original coils out, exactly the same. I could have got Dephi coils for that same price. I took me about a hour to R&R the coils, including pulling the plugs to check them.



The dealer want 350.00 to diagnose the problem and $1,300.00 to R&R the coils.

An Indy shop near (owned by a former BMW mechanic) wanted 250.00 to diagnose and $1,200.00 to R&R the coils. I don't know how these guys get away with this crap… it's straight up fraud.



I can't complain about about the coils. They were the original coils on the car. I picked up the car from the dealer in March 2010. They "gifted" me with a 100,000 mile service and warranty "upgrade" so it was maintained at the dealer through 100k mikes. It has 168k mikes on it now and still runs like new other than very slight increase in oil consumption. I think that's associated with the PCV/CCV.



Really my only complaint is with the plastic BMW uses. If you look at too hard it will break, this began at about 20K miles and now I just do t want to touch anything plastic under the hood. I recently replaced the cabin air filters and the fasteners and parts of the covers just literally crumpled when I touch them.



If keep the car much longer I'll need to replace all those parts and all the parts associated with the seal/baffle at the rear of the engine compartment. All of those parties have crumbled away.