Surasonac

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.

Loki

iTrader: (1)

When you say easy to see.... what are you seeing?

Surasonac

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.

Loki

iTrader: (1)

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.

Surasonac

Okay thats the next thing on my list to do then right after an oil change. I'll let you know what I find.

MuAz Al-Khair

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.