trigger points question, double firing?? Options

[jeremiah98125]

I seem to have an issue with my injector trigger points on 72 1.7L. All 4 cylinders seem to be running a little rich which I think is another issue, but 2 of the diagonal ones (2+3) are super rich, they totally blacken the spark plugs within a few minutes. I pulled the distributer and cleaned up the trigger points with some contact cleaner and they looked fine to me. It seems from what I've read that they are double firing? What would cause this? Wondering what I should be looking for when I pull the distributor again, and how I can test them once removed? They have 60k miles on them, would a new set be worth the $$? thanks!

[Cap'n Krusty]

As for the testing, I agree with George. Effective testing requires fundamental parameters to be at base. That means reasonably even compression and correctly adjusted valves.

As to the "double firing" issue, the first I've ever heard that brought up as a potential problem was yesterday, or the day before, in another thread. I've never seen it on any D-jet car. That doesn't mean it can't/doesn't happen, just that I've not seen it in 37 years of working on D-jet cars. I've asked a couple of other ol'pharts in the biz, and they've never seen it, either. FWIW, the most common failure mode of trigger points is that they fail to make the necessary contact and either 2 or all of the injectors don't fire.

The Cap'n