CEL and code P0306
12-22-2007, 05:19 PM
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1999 C280 Sport
CEL and code P0306
I know that this is a cylinder 6 no spark code. What would cause this. I have changed the plugs and switched the coil from another cylinder but I still get rough idle and code P0306. Could the spark plug wires fail that quick? Can I test the wire with an ohm meter? Thanks for all help you can supply to me. I have a 99C280 Sport.
12-22-2007, 08:58 PM
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Did you change the plugs before or after getting the error code? Yes. Yes, but with carbon wires you could test OK with a meter and fail under load.
12-22-2007, 11:22 PM
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1999 C280 Sport
I got the error code then changed the plugs and switched the coils. Yes there is good compression on #6. This just started after a stop home after work. Thought that maybe the wires got wet. Going to try and switch wires tomorrow to see if it changes to another cylinder. 
