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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Dave_Darling |
Apr 8 2010, 11:29 AM
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#2
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914 Idiot Group: Members Posts: 14,991 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California |
Cap'n, please check page 0.1-1/9 in your factory manual. You'll see the diagram of intake opening, spark, and injection in the middle of the page. Notice that there is one injection event ("B") per cycle. For cylinders #1 and #3, the injection event happens at the beginning of valve opening ("A"), and for cylinders #2 and #4 it happens about a quarter-cycle before valve opening.
I think you're mixing D-jet up with L-jet, which opens all four injectors twice per cycle. --DD |
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