[Aronis]

Originally Posted by pbonsalb

If you don’t use a skinny socket, you may not have properly tightened the plugs. If you did not check the plug gap, it could be off. It is also possible you did not fully seat the coil. Whenever work is done and a new problem occurs after, I double check my work. A harness or connector could also have been disturbed, but it seems odd that would affect just #6.

If none of those, I would lean towards a coolant leak damage since 6 is on the tank side. The coils and plugs are new so I would lean towards the injector. You could certainly swap plug and coil from #6 to #5 first to see if the problem moves before focusing on the injector.

I agree, you have to make sure the plugs are properly seated and that their crush ring is crushed. The technique that some discuss is torquing to a number then torqueing a bit higher, the first torque number gets the crush ring crushed and the second finishes it off. On this Bitch of a car, if you have to go back and tighten more, it's just that a bitch and you have to take a bunch of shit off.

I plan on this service again soon as I have 55k miles.

Mike

[pmsteinm]

I really don't want the dealer to do this. I'll ask for an experienced tech but even then, I'm not sure I trust them to do it. A friend of a friend worked at an MB dealership as a tech... with no experience or training to start. He wanted to be a detailer and they need more techs so he got co-opted. It made me realize how the people doing most the work on your car have no more training than you do. Your only hope it they have experience doing more than just your car, and that the experience developed good habits on not bad ones. That is why ISTA spells out the steps so anyone can follow them.

Great example, when I did my wife's X5 brake bleed, they left the inboard rubber cap off of one of the screws. All kinds of crude came out in the bottle. Sigh.

[RobRed]

just did this service (32k miles)... car was getting stage 3 tune and i had the shop (Carbahn) do it. Plugs and coils all in about $875.

Coils were a "since you are there" replacement