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Old 06-02-2024, 01:56 PM   #1
riboyster
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Exclamation 2nd Cylinder 1 Misfire in 2 weeks

Hey guys, hope you've been well. Car just made 100K miles. My plugs finally shit the bed a month or two ago, so I replaced all of them and all of my ignition coils with OEM parts.

Last week I got cylinder 3 misfire. Like...completely dead. Had to tow the car. Swapped the coil into cylinder 1 to see if it was the plug or the coil - lo and behold, cylinder 1 started misfiring. So I figured, shitty coil, replaced it. Problem resolved, no biggy.

Now today, after a couple of boosts (Sprintex 210) I'm getting a cylinder 1 misfire. It only seems to happen at idle and low load. I have a replacement coil and plug - but I would really like to solve the root of the issue. Everything looks fine on my OSDB reader. Also I'll mention that my car hasn't pulled any timing, so I don't believe the issue to be knock-related.

Anybody have any ideas? Thanks in advance.
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Old 06-04-2024, 04:42 PM   #2
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Hey guys, hope you've been well. Car just made 100K miles. My plugs finally shit the bed a month or two ago, so I replaced all of them and all of my ignition coils with OEM parts.

Last week I got cylinder 3 misfire. Like...completely dead. Had to tow the car. Swapped the coil into cylinder 1 to see if it was the plug or the coil - lo and behold, cylinder 1 started misfiring. So I figured, shitty coil, replaced it. Problem resolved, no biggy.

Now today, after a couple of boosts (Sprintex 210) I'm getting a cylinder 1 misfire. It only seems to happen at idle and low load. I have a replacement coil and plug - but I would really like to solve the root of the issue. Everything looks fine on my OSDB reader. Also I'll mention that my car hasn't pulled any timing, so I don't believe the issue to be knock-related.

Anybody have any ideas? Thanks in advance.
Spark plug keeps gapping itself. Any ideas?

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Old 06-04-2024, 08:55 PM   #3
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What brand of plugs do you have. I don't recall seeing the electrode that recessed in standard oem plugs.
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Old 06-05-2024, 01:42 AM   #4
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lol spark plug modz
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Old 06-05-2024, 10:00 AM   #5
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2 threads in 2 days for the exact same thing with the exact same post?
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Old 06-05-2024, 07:35 PM   #6
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and have you ever looked at logs while driving it hard or you have no clue if it s detonating ?
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Old 06-06-2024, 03:23 AM   #7
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Just DENSO oem plugs that keep failing. 2 posts on 2 threads because I didn't get a response in over a day on this one.

Yes, I have logged my pulls, am not knocking or pulling timing.

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Old 06-06-2024, 03:24 AM   #8
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What brand of plugs do you have. I don't recall seeing the electrode that recessed in standard oem plugs.
It didn't start this way. It ended this way.

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Old 06-06-2024, 06:49 AM   #9
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If it didn't start that way, then you have some detonation or something wrong going on inside that cylinder.
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Old 06-06-2024, 09:25 AM   #10
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Is the knock sensor muted in your tune?
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Old 06-06-2024, 06:30 PM   #11
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how much PI% do you have at high rpm high load?
how far is the end of injection to the spark ignition? there is a value for that in ecutek measured in milliseconds

do you have access to an external wideband afr sensor ?
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Old 06-06-2024, 10:35 PM   #12
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2 threads in 2 days for the exact same thing with the exact same post?
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and have you ever looked at logs while driving it hard or you have no clue if it s detonating ?
tires look wideband af
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Old 06-07-2024, 03:40 AM   #13
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kek
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Old 06-13-2024, 07:11 PM   #14
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I'm chalking it up to chinese plugs. No knock, nothing about the tune or timing or fueling or scaling has changed since I swapped the plugs. Seems to run fine now.
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