Catalytic Converter
... phosphorus from oil burning and/or carbon from oil burning, a rich fuel mixture or frequent short trip driving where the converter rarely ...

Emissions Testing: Will Your Car Pass?
Automotive emissions testing,l and what do when when your car fails a smog check valve ... has multiple problems (one or more fouled or worn spark plugs, one or more bad plug wires, plus worn rings and valve guides), zero in on ...

Interpreting your spark plugs
... Oil fouled plugs such as these are often found in new or recently overhauled engines, before normal oil ... retarded timing or low compression. If only one or two plugs are carbon fouled, check for corroded or cracked wires on the affected plugs.

RANDOM MISFIRES
... Random misfire caused by a loss of spark or a weak spark may be due to fouled spark plugs, plug gap too ... coil or rotor Remove and inspect the spark plugs. If oil or carbon fouled, the engine is probably sucking oil past worn valve guides

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