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Confusing misfire issue

Old 10-24-2018, 07:20 PM
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Confusing misfire issue

So I finally got an spark tester because my idle is quite often a little rough. Its not super rough but its enough to hear it, I can see the needle wiggling and the exhaust quietly changing pitch.
I read the misfire thread and its none of those things.
I have d585 coils, brand new leads and plugs. I already checked the grounds and they are fine.

Leading 1 seems to be fine. But when I put the spark tester on Trailing 1 and Leading 2 its pretty easy to see that its misfiring. Whats also strange is my CEL doesn't flash to tell me there is a misfire either. And this problem does not occur at higher RPM. ONLY at idle.

I wouldn't say this is really an issue, just a minor annoyance to be fixed eventually. Its certainly not a priority.
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Old 10-24-2018, 07:51 PM
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When you say easy to see.... what are you seeing?
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Old 10-24-2018, 08:04 PM
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Originally Posted by Loki View Post
When you say easy to see.... what are you seeing?
Instead of a steady pulse as there is on Leading 1, the light randomly goes out and comes on which coincides with the drops in RPM.
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Old 10-24-2018, 11:58 PM
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Try swapping whatever coil is doing that to another position and see if the problem follows.

I know your coils are new, but duds happen.
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Old 10-25-2018, 09:13 AM
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Originally Posted by Loki View Post
Try swapping whatever coil is doing that to another position and see if the problem follows.

I know your coils are new, but duds happen.
Okay thats the next thing on my list to do then right after an oil change. I'll let you know what I find.
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Old 11-11-2018, 10:05 PM
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Did you make any change/upgrade shortly before it happened?

lots of possibilities though..

could be electronics, relay, air sensor, 02 sensor, etc.

could be wear and tear of the coils, plugs, wires.
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