Quote:
Originally Posted by 97 SL320
What changed on the engine? I know there is a difference between valve covers / coil cover between early / late but I don't see that making a difference.
The only difference I know of is 91 ish M104 300sl / 300 CE had a distributor and later cars had 3 coils on 3 plugs and 3 wires running to the other 3.
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I suspect that the wire routing changed early in production.
Length for cylinder 1 changed from 490mm to 550, cylinder 3 from 240 to 350 and cylinder 5 changed from 430 to 550 mm. Wire ends at plug and coil also changed.