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Super Coupe Plugs and
Ignition Wire How-To





Before starting you will need the following:

Recommended spark plugs are Motorcraft AWSF-34PP, or Autolite
APP
2544
. Make sure the spark plugs are double platinum. Plugs not recommended
are Bosch, NGK & Split Fire. Dielectric grease is also recommended
to reduce moisture buildup in the boots, and prevent voltage leaks.


Replace the plug wires with some high performance (low resistance)
wires. MN12 Performance recommends plug wires from Magnecor 10mm fits 1989-1995
3.8L SC. Magnecor wires offer less resistance, about 3000 ohms per
foot compared to 6000 ohms for the stock wires. Magnecor
Competition Ignition Cables
(unlike conventional resistive carbon conductor
ignition wires) use a 2.5mm Metallic Inductance Suppressed conductor and
are specifically designed to conduct the total output of the ignition coil
(which, with some racing ignition systems can be considerable) and provide
RFI (radio frequency interference) and EMI (electro magnetic interference)
suppression.


Installation:

The spark plugs and wires on the 3.8L SC engine can be removed by accessing
them from underneath the car. Before beginning jack the driver side of
the car up and block the wheels. The driver side plugs and wires can be
accessed by reaching up past the exhaust manifold and pulling the boots
off the plugs. It is easier if you have a 1/4 in ratchet with your spark
plug socket due to the tight confines of the plugs. (Note:
On the 1994-1995 3.8L SC cars you can access the 5 & 6 plugs from the
top due to a smaller brake resivour.)
Next, remove the driver
side plug wires with the separators and lay them aside while you remove
the spark plugs. Gap the new spark plugs between .052 - .056 or per the
emissions label. Install the spark plugs with 7-13 lbs of torque. Next,
lay the new plug wires down next to the old plug wires and identify the
correct length wires. Unclip the stock wires from the separators and modify
the clips to accept the 10mm wires (see
picture
) clip them in the same location on the new wires. Not all
wire looms will be required when the new plug wires are installed. If you
break a wire loom a new clip is available from Motormite part#
40288
. Be sure to add some dielectric grease to each end
of the plug wire boot before installing them on the plugs & coil pack.
Remove the rest of the wires on the distributor and install the drivers
side boots over the #4, #5, & #6 cylinders(see diagram). (Note:
verify that the plug wires are fully seated on the plugs and the clips
are fully seated on the distributor).




Lower the car and proceed to the passenger side. You will need to remove
the black intake tube & air box cover assembly that connects the throttle
body to the Mass Air Flow sensor before you can remove and install the
new plug wires. The passengers side plugs and wires can be accessed from
the top by reaching between the heater hoses. A small arm will really help.

(Note: you can access the #1 plug boot from the front
once the intake tube is removed).
Next, remove the passengers side
plug wires with the separators and lay them aside while you remove the
spark plugs. Next, lay the new plug wires down next to the old plug wires
and identify the correct length wires. Unclip the stock wires from the
separators and modify the clips to accept the 10mm wires (see
picture
) clip them in the same location on the new wires. Gap the
new spark plugs between .052 - .056 or per the emissions label. Install
the spark plugs with 7-13 lbs of torque. Add some dielectric grease to
each end of the plug wire boot before installing them on the plugs &
coil pack.
(Note: verify that the plug wires are fully
seated on the plugs and the clips are fully seated on the distributor).
Start
the car and check for proper idle. The vibration of the vehicle traveling
will quickly loosen up any boot/terminal assembly not properly engaged.
Also, if you experience an engine miss under boost check for a loose plug
wire.





MN12 Performance Inc.

703-968-6513

[email protected]
 
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