V8 Quattro V8-3562cc 3.6L DOHC (PT) (1990)
Spark Plug: Testing and Inspection
Checking Spark Plug For Wear, Damage, Or Deposits
1.
Inspect the spark plugs for:
^
Improper gap
^
Carbon deposits
^
Cracked center electrode insulator
^
Burned or worn electrodes (may be caused by):
^ Excessive mileage
^ Lean fuel mixture
^ Advanced ignition timing
^ Loose spark plug
^ Plug heat range too high
^ Insufficient Cooling
^
Fouled plug (may be caused by):
^ Rich fuel mixture
^ Retarded ignition timing
^ Oil in combustion chamber
^ Incorrect spark plug gap
^ Plug heat range too low
^ Excessive idling/low speed running
^ Clogged air cleaner element
^ Deteriorated ignition coil, coil wire or ignition wires
2.
Replace the plug if the center electrode is rounded.
Standard Type
BOSCH H-6-DCO (or equivalent)
3.
Adjust the gap with a suitable gapping tool.
Electrode Gap:
0.028 - 0.036 in. (0.7 - 0.9 mm)
Tightening Torque:
22 ft.Lbs (30 Nm)