You did the harness yourself?I have not removed the coils, but I have done the wire harness.
The only access to undo the wires is to remove the starter. Removing the starter is interesting. It helps to have long extensions and universal joint sockets to get the starter out.
I did this on a lift so life was much easier. This could be a real PIA on your back.
How is your wire harness? Has it been replaced?
Oh you are lucky. Your brother is the brother I never had!Did the harness with the advice and help of my brother who works on Mercedes for a living. It only took us a little over a 2 hours including chatting and my brother working on another car.
I got the harness at cost which is much less then what you are going to pay which I think retail is around $650. That is not bad as the next day they quoted $1200 for the C280 harness. I also replaced the coil power harness.
The job is way easier on a lift as the car went up and down a bunch of times. You have to pull the windshield washer bottle, throttle body, the oil filter and the starter. Pull all the bolts holding the main harness body and then cut all the ends off and rip it out. Bolt in the new harness and put on the new connectors and vacuum hoses.
There are a few wires you do not want to have to replace so you need to be careful. You may not get both bolts back on the connector that is under the manifold.
It was not too bad, but everything went with few problems. Others are not as cooperative and cursing is expected. Having the right tools at hand and an very experienced person helps quite a bit.
The starter can be a very difficult to get loose. The 2 bolts are interesting to get to and my brother regularly abuses the Snapon 3' extension and universal joint sockets doing his day to day job. I could not get to the bolts with the sockets I picked up. He had the starter off in in no time. Took him longer to figure the twists and turns to snake the starter out of the hole.