1999 Plymouth Breeze spark plugs fouling out

Problem & Possible Cause. Action

Carbon Fouled Plugs
Clogged Air Filter. Replace Air Filter
Incorrect Idle Speed. Reset Idle Speed
Faulty Ignition Wiring. Replace Ignition Wiring
Sticky Valves/Worn Valve Seal. Check Valve Train
Fuel Injection Operation. Check Fuel Injection

Wet/Oil Fouled Plugs
Worn Rings/Pistons. Overhaul/Replace Engine
Excessive Cylinder Wear. Overhaul/Replace Engine

Plug Gap Bridged
Combustion Chamber Carbon Deposits. Clean Combustion Chamber

Blistered Electrode
Engine Overheating. Check Cooling System
Loose Spark Plugs. Clean/Torque Plugs
Over-Advanced Timing. Reset Timing
Wrong Plug Heat Range. Install Correct Plug

Melted Electrodes
Incorrect Timing. Reset Timing
Burned Valves. Replace Valves
Engine Overheating. Check Cooling System
Wrong Plug Heat Range. Install Correct Plug