Corral Elite Member
Join Date: Nov 2000
Location: Chesterfield, MO
There is a very good write-up in the Haynes manual for checking the coil packs (pre-99 models, not the coil-on-plug coils).
Primary resistance: check the resistance between the middle (plus) and the two outside (minus) contacts inside the oval connector on the front of the pack. The resistance should be the same between all four readings, 0.3 to 1.0 ohms.
Secondary resistance is easier. Measure the resistance between each pair of terminals (7/4, 8/2, 1/6, 3/5). You have to remove the plug wires so make a sketch of the pack and wire connections and mark each wire before you take the wires off. The resistance should be the same between all four readings, 6.5 to 11.5 kohms.
Be careful when removing the wires from the coil packs. The plastic clamp on each plug wire is pretty delicate so rough handling will result in breakage and you will then need a new set of wires. Squeeze, twist a little to break the 'seal' (still squeezing the clamp open), and pull straight up (still squeezing the clamp open).
Put a dab of dielectric grease on each the inside of each plug wire connector before re-installing on the coil pack.
That's the short form. Refer the the Haynes manual or similar for the full story.
2012 GT RTR 6MT; performance white / charcoal
* 3.73's, FRPP ProCal tune, MGW Gen3 shifter, FR GT500 Touring axlebacks, BMR LCAs, Steeda Panhard bar & brace, JLT PCV catchcan