Quote:
Originally Posted by Chas H
I don't think a test is valid.
A plugged cat will degrade engine performance but will likely not cause misfires. Bad plug wires will cause misfires and are a known source of such.
I replaced a set recently on 2000 E320 and the wires tested good. I replaced them on the advice of a friend who is the parts manager at the local dealership- I did not buy the wires from Benz and he knew I wasn't going to.
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I'm sorry but yes they can be tested. The nominal value is 2000 ohms. It's not a simple conductivity check. Zero ohms indicates a bad wire.
BTW, the odds of all 12 coil wires failing at once is higher than the winning lottery ticket. Mostly they last the life of the car although one or two may be damaged by someone trying to change the plugs with the wrong tools. In the good ole days, the carbon core plug wires were changed as a set since vibration was the culprit.
But the OP has solved his problem which is plugged cats. And they can cause misfires and/or other engine symptoms like stalling, etc.