Service manual

90-898303
4-29
EFI Detonation Control System
The detonation control circuit is located in the ECM. This circuit monitors 2
detonation (knock) sensors; 1 each located in each cylinder head. When
detonation is initially detected, timing is retarded. If detonation continues, fuel
mixture is richened.
a) Detonation Sensor (1 Per Cylinder Head)
Spark Plugs and Wires
Damaged or loose spark plug wires may cause plug fouling. Most wire
damage is the result of rough handling and the use of incorrect tools to
remove and install wires.
• Check that all of the plug wires are fully engaged onto the coil towers and
the spark plugs.
• Check the spark plug wire boots for damage.
NOTE: Slightly stretching the boot may show a cut or hole that otherwise may
not be seen.
NOTE: To prevent spark plug cross-threading, use a piece of hose pushed
over the plug. (Gray fuel hose with 8 mm (0.315 in.) I.D. works well.) This will
allow you to thread the plug into the spark plug hole by hand while avoiding
cross-threading. Torque plug to the specified value.
Notes
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