Jan Greeff
Member
- Joined
- Sep 23, 2012
- Messages
- 11
- Reaction score
- 0
- Location
- Bela Bela, South Africa
- Your Mercedes
- C200 1997
My 1997 C200 started running on three cylinders. There was oil on no. 2 spark plug from a leaking plug tube seal so I replaced the seals and cleaned the oil, hoping that that would be it.
The car still ran on two cylinders. I tried to find the cause, changed the coils and plugs around etc but then it started ro run on two cylinders. One ignition coil tested faulty so I replaces it, but now it is running on three again, seems both coils were damaged.
What mystifies me is the fact that, according to the wiring diagram, two plus fire simultaneously from each coil, there is continuity between the two plug connector outlets but only one plug fires. Surely if one fires the other should too?
Spark plugs, leads and connectors are all fine and the feed to the coils is also OK, so why does each coil only fire on one cylinder? The one coil works on the plug direcly under its mounting and is dead on the other plug, the other coil is exactly the opposite.
I have orderer the second new coil, but the mystery remains. Another mystery is why both coils at the same time?
The car still ran on two cylinders. I tried to find the cause, changed the coils and plugs around etc but then it started ro run on two cylinders. One ignition coil tested faulty so I replaces it, but now it is running on three again, seems both coils were damaged.
What mystifies me is the fact that, according to the wiring diagram, two plus fire simultaneously from each coil, there is continuity between the two plug connector outlets but only one plug fires. Surely if one fires the other should too?
Spark plugs, leads and connectors are all fine and the feed to the coils is also OK, so why does each coil only fire on one cylinder? The one coil works on the plug direcly under its mounting and is dead on the other plug, the other coil is exactly the opposite.
I have orderer the second new coil, but the mystery remains. Another mystery is why both coils at the same time?