Gen3 Misfire codes*update*

[TnWHTMARE]

Mine started out like that and is now at RevAuto getting torn apart. Funny enough had the Lund e85 tune and started having starting hesitation. Instead of getting looked at I went whipple. Starting issue got worse, plugs kept fouling and then the oil issues got really bad and coming up through catch can on drivers side head dripping into the intake box and also getting sucked into supercharger. I find out this week, hopefully, what is wrong.

Advise, get it looked at now by a shop asap. I would. Be worried about a mechanical issue like you have

Car is a 2018 a10 Lund e85 tune for about 12k miles and whipple about 6k.

Thank you for the heads up!

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[TnWHTMARE]

Strangely enough, since I swapped the plugs between 1 and 5, the mis-fire code hasn't come back. Yet. In the past, by now, it would have after clearing the code. Theory: Possible #5 DI injector dumping more fuel than it should. But would that "compromise the efficiency" of the spark plug? Like to the point that it would not be as able to fire off the compromised cylinder but do "oK" in another cylinder that doesn't have a potential faulty DI injector?

 

[BlackandBlue]

It could be. But I doubt it. I would think spark plug gap variances, manufacturing variances, and plug fouling would be much more likely.


You been mashing on that gas? Spark plugs love heat.

 

[TnWHTMARE]

It could be. But I doubt it. I would think spark plug gap variances, manufacturing variances, and plug fouling would be much more likely.


You been mashing on that gas? Spark plugs love heat.

YES, I got on the throttle sir....several times.....This is crazy, what has happened to me that I have to be encouraged to stab the throttle. So, I find it odd that IF this were a fouled/faulty plug that its not affecting cylinder #1. I'll give another couple of days just to make sure.

 

[Jetnoise]

Strangely enough, since I swapped the plugs between 1 and 5, the mis-fire code hasn't come back. Yet. In the past, by now, it would have after clearing the code. Theory: Possible #5 DI injector dumping more fuel than it should. But would that "compromise the efficiency" of the spark plug? Like to the point that it would not be as able to fire off the compromised cylinder but do "oK" in another cylinder that doesn't have a potential faulty DI injector?

Tune? Intake manifold or upstream preferential treatment...crankcase pressure...injector...plug itself seat/threads in head...rings/piston in hole 5?
If #1 wasn't so clean I'd say 5 don't look to bad. How do the other 6 look?

 

[TnWHTMARE]

Tune? Intake manifold or upstream preferential treatment...crankcase pressure...injector...plug itself seat/threads in head...rings/piston in hole 5?
If #1 wasn't so clean I'd say 5 don't look to bad. How do the other 6 look?

I havent pulled them yet. I just havent had time because of work. I hope to check gaps and pull them tomorrow evening. Just odd that so far its failed to kick the misfire code after I swapped the plugs.

 

[Jetnoise]

I havent pulled them yet. I just havent had time because of work. I hope to check gaps and pull them tomorrow evening. Just odd that so far its failed to kick the misfire code after I swapped the plugs.

Get busy...;)
Maybe your tuner would recommend a different plug to run? ....so while you are at it....

 

[TnWHTMARE]

Get busy...;)
Maybe your tuner would recommend a different plug to run? ....so while you are at it....

Sheesh, are you trying to give blackandblue a run for his money!! You peeps are a tough crowd. Seriously though, thank you. I may email Jon Jr. tomorrow and see if he recommends a different plug. I'm kind of an NGK fan myself.

 

[Jetnoise]

Sheesh, are you trying to give blackandblue a run for his money!! You peeps are a tough crowd. Seriously though, thank you. I may email Jon Jr. tomorrow and see if he recommends a different plug. I'm kind of an NGK fan myself.

Not at all...just thoughts to share to make you think and trouble shoot without much coin involved
I'll bow out.
Fwiw...NGk has never served me well but run what you like

 

[TnWHTMARE]

Not at all...just thoughts to share to make you think and trouble shoot without much coin involved
I'll bow out.
Fwiw...NGk has never served me well but run what you like

Dude, I was totally being funny...thats why I had the laughing emoji. I'm sorry if it came across wrong, I very much appreciate your advice and input. I like the "think" through it, Its why I started with a plug swap and then, if necessary a coil swap. As you said, its a low/no coin first step and helps me begin to eliminate the source of the misfire.
That is interesting about your experience with NGK, I have generally always heard very positive things about them.
Anyway, thank you again.

 

[TnWHTMARE]

Just a quick recap: Jon Jr. wants me to switch back to 93 and see how it responds. That is the next step. For that to happen I have to run my tank of corn out. In the meantime, I cleared the codes again, swapped cylinders 1 & 5 spark plugs and have checked from time to time for pending codes. As I have already said, the P0305 and P0316 have not reappeared. This morning however, I checked and I did have a PO316 and a new one, PO300. But still no PO305. And NOT that I have had a code P0301, but since I moved cylinder 5's plug to cylinder 1, attempting to discern if I have a failing plug in 5, I still have not seen a PO301 after that swap. Anywho, just documenting for now and I do so hoping that somewhere down the line it may be of help to someone else in case they run into a situation similar. Data/information is always good.

 

[TnWHTMARE]

Well, swapped back to 93 and no misfire codes. Interestingly, I pulled cylinder 5 plug out last night just to check its progress and the ground strap was wet with fuel. I'm wondering if I may have a faulty DI/ Port injector.

 

[TnWHTMARE]

Just another follow up....replacing plugs last night and ran an inexpensive bore scope into the cylinder to see what I could see...quality isn't great but I do believe there is a decent amount of fuel sitting on top of the piston. The scope picture quality wasn't good enough to determine whether what appears to be scoring is actual damage or not. Never-the-less, its more empirical data to give the dealer.

 

[TnWHTMARE]

Here you can kind of make out some marks on the walls but it is faint.

 

[usgiorgi]

That looks like oil, not fuel. Gas is pretty much clear. Looks like you have quite a bit of oil getting into the cylinder. I'd do a compression test right away.

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