2nd Cylinder 1 Misfire in 2 weeks

[riboyster]

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.

[riboyster]

Originally Posted by riboyster

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?

Sent from my Pixel 7 using Tapatalk

[blsfrs]

What brand of plugs do you have. I don't recall seeing the electrode that recessed in standard oem plugs.

[Ultramaroon]

lol spark plug modz

[Tokay444]

2 threads in 2 days for the exact same thing with the exact same post?

[tomm.brz]

and have you ever looked at logs while driving it hard or you have no clue if it s detonating ?

[riboyster]

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.

Sent from my Pixel 7 using Tapatalk

[riboyster]

Originally Posted by blsfrs

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.

Sent from my Pixel 7 using Tapatalk

[dragoontwo]

If it didn't start that way, then you have some detonation or something wrong going on inside that cylinder.

[Tokay444]

Is the knock sensor muted in your tune?

[tomm.brz]

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 ?

[Ultramaroon]

Originally Posted by Tokay444

2 threads in 2 days for the exact same thing with the exact same post?

Originally Posted by tomm.brz

and have you ever looked at logs while driving it hard or you have no clue if it s detonating ?

tires look wideband af

[tomm.brz]

kek

[riboyster]

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.