Ignition Coils

[Wizard765]

Ok I am having a problem with my 84 and I'm starting to think I have a weak coil. Is there a way to test a coil? I'd like to know if I have a bad one and if the replacements I have are any good BEFORE I dig these out.. Looks to be a little complicated getting them out.

[mbrood]

Mounted on the top of the tray that also holds the TCI and boost sensor (bolted from the bottom), they aren't the most friendly to get to but it's do-able. The tray itself is bolted to the frame from the outside with 4 bolts and would "really like" to have the fairings off for access... but I don't believe tray removal is required.

 

Be sure to measure the primary, the secondary and then check each one's resistance to chassis ground (or coil case). There are checks for spark length in the service manual and, no, you don't need the fancy factory tool... it's just a spark gap... easily jerry-rigged (.24").

(2.4-3.0 Ohms primary, 10.6K - 15.8K Ohm secondary)

 

One issue that is real tough to isolate is that SOME have shown a tendency to fail with upper heat limits of the surroundings and vibration... both tough conditions to test, easier by replacement of suspect.

[bongobobny]

A common issue with the coils is corrosion on the spark plug end. Pull the caps and look for nice shiny brass look. If you see any green at all, there's a problem. Also, when you put the wires back on, trim about 1/8 to 1/4 inch of the wire off so it will make a good connection again...

[dingy]

I have a extra set. Let me know if you need them and I can take to IR. Carl or someone can get them to you.

 

Gary