The copper type leads rarely cause problems however the spark-plug connectors accumulate dust inside and become conductive .
A thorough clean-up before re-installing will help.




Ad

Want to discount my plug wires from being an issue...
They are stamped Brem 30/06 which I assume means the are Brem made and manu date is week 30/2006...

They look fine, and have done few miles, and the resistances come in @1.1 to 1.24 K Ohms.. the 1.24 is on plug wire for #2 cylinder.

Is that good?

__________________
2009 Mercedes ML320 Bluetec