trigger points question, double firing?? |
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trigger points question, double firing?? |
jeremiah98125 |
Apr 7 2010, 04:24 PM
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#1
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jr Group: Members Posts: 37 Joined: 11-November 09 From: seattle, wa Member No.: 11,031 Region Association: Pacific Northwest |
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!
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Cap'n Krusty |
Apr 7 2010, 07:10 PM
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#2
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Cap'n Krusty Group: Members Posts: 10,794 Joined: 24-June 04 From: Santa Maria, CA Member No.: 2,246 Region Association: Central California |
If the problem is truly in the trigger points, and your wiring is correct, you should have problems with opposite cylinders, not diagonal ones. Be sure the wires are in the correct places (if the boots are still there, both gray ones to one opposite pair, both black ones to the other pair). As the injectors fire twice per full cycle, the position shouldn't matter all that much, but they should be right anyway, just 'cause. Just for grins, swap the wires fore and aft and see if the problem moves with them. Another thing you might try is to pull one injector plug at a time and check the RPM drop. Wait 15-20 seconds after plugging one back in before you try another, to allow the engine to stabilize.
One thing we haven't addressed is the possibility of a nasty spray pattern of the 2 injectors that seem to have a problem. You'll have to pull them, jumper the fuel pump relay, and trigger the individual injectors, one at a time, and looking for a nice conical fog spray pattern. A drizzle, a stream, or other pattern that's not a fog, will cause that cylinder to run poorly, probably even rich. Let's keep this discussion going, because it's what we're all here for! The Cap'n |
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