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Discussion Starter · #1 ·
I just started data logging on my vehicle once again and am noticing a decent amount of misfires on small trips.

Just got back from taking my son to school and back(8mi, 20ish minutes of driving), 3 misfires on cyl 1 and 1 misfire on the rest.

I have HKS M45XL plugs and MSD Ignition coils which resolved some problems. The coils fixed the RPM dips on idle and when I replaced the plugs initially, the car did feel great but that wore off pretty quickly. When I did replace the plugs at 25k, two of em were pretty burnt. Pretty sure one of the burnt ones was cyl1 plug.

It's raining all week and I don't have a garage. I'll go check my plugs at some point this week, but I wanted to see if anyone else knew what would be causing the misfires.

Here's a dump of my logs from this morning:
Code:
MID:$a2 TID:$0c
Misfire counts for last/current driving cycles(calculated) - Misfire Cylinder 1 Data
Max: 65,535Count   Min: 0Count
Test result value: 3Count
PASS
----
MID:$a3 TID:$0c
Misfire counts for last/current driving cycles(calculated) - Misfire Cylinder 2 Data
Max: 65,535Count   Min: 0Count
Test result value: 1Count
PASS
----
MID:$a4 TID:$0c
Misfire counts for last/current driving cycles(calculated) - Misfire Cylinder 3 Data
Max: 65,535Count   Min: 0Count
Test result value: 1Count
PASS
----
MID:$a5 TID:$0c
Misfire counts for last/current driving cycles(calculated) - Misfire Cylinder 4 Data
Max: 65,535Count   Min: 0Count
Test result value: 1Count
PASS
----
 

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2019 GT N-Line; Fiery Red 6MT
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Yeah that's interesting. I've heard of the plugs and coils usually fixing the problem. You could try swapping the coil around and see if the issue follows it (i.e maybe one of the MSD coils is bad?). The only other thing I could thing of is spark plug gap or worse case a possible injector problem. Again, swapping these items around could be a cheap way of attempting to find the problem.
 

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Discussion Starter · #3 ·
Code:
MID:$a2 TID:$0c
Misfire counts for last/current driving cycles(calculated) - Misfire Cylinder 1 Data
Max: 65,535Count   Min: 0Count
Test result value: 5Count
PASS
----
MID:$a3 TID:$0c
Misfire counts for last/current driving cycles(calculated) - Misfire Cylinder 2 Data
Max: 65,535Count   Min: 0Count
Test result value: 0Count
PASS
----
MID:$a4 TID:$0c
Misfire counts for last/current driving cycles(calculated) - Misfire Cylinder 3 Data
Max: 65,535Count   Min: 0Count
Test result value: 2Count
PASS
----
MID:$a5 TID:$0c
Misfire counts for last/current driving cycles(calculated) - Misfire Cylinder 4 Data
Max: 65,535Count   Min: 0Count
Test result value: 2Count
PASS
----
My run getting him from school was a bit worse.

I don't want to assume the coils or plugs are bad because these should be the best options for our vehicles. Also, since all of them are missing I wouldn't even be able to make that good of an assessment. I scheduled an appointment with my dealer tomorrow for an early 30k maintenance and to perform a diagnosis. I also wanted them to check out my turbo oil lines anyway so hopefully I'll figure something out then.
 

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Discussion Starter · #5 ·
They are. I'm not sure why I said I was still using those(maybe because the box is on my desk and it was early?). I did get a spare ecu tune from lap3 and installed the hks plugs when I was installing it but reverted to new oem plugs when the tune ended up bad.
 

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Discussion Starter · #6 ·
I guess I banged two of the plugs during install. Dealer replaced them and my counts are only 0-1 misfires now. They also ended up having a Veloster N PP that I talked myself into buying, so I'll be upgrading this weekend and listing my aftermarket parts shortly afterwards.
 

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Discussion Starter · #10 ·
Are you running dual OCC's ?
Single.

I think he is going to get a Veloster N. Performance Pak
Correct.

I'm actually on the fence about getting rid of this car. The extra space and comfort will certainly be missed. If the N doesn't blow me away when I drive it this weekend I may end up sticking around. We'll see.
 

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Single.



Correct.

I'm actually on the fence about getting rid of this car. The extra space and comfort will certainly be missed. If the N doesn't blow me away when I drive it this weekend I may end up sticking around. We'll see.
Thought about the Sonata N-line? Comfort...extra space.
 
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