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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Yes it will cause misfires. I have one in the shop right now that has the exact symptoms as the OP, it would barely pull into the shop with the accelerator all the way to the floor. Left side cat was stopped up, and it had P0300, P0304, P0305, and P0306 (misfires cylinders 4, 5, and 6).