The coil packs don't decide when they fire. The signal sent to them does that. All they can really do is not fire when they are told to, or not fire strong enough, or fire intermittently. Any of which would as you said, throw misfire codes.

I'm thinking maybe something wrong with the rings in those cylinders. Not gapped correctly, etc.

 

If the rings weren’t gapped correctly, would it cause those two cylinders to get hotter than the others?

 

Yes, potentially, depending on how out of spec they were gapped.

 

U should ask if Jeremy Allen is there so u can talk to him since he builds inline pro motors. Just so I can also clarify if he still works for them lol

 

Sounds like Inline Pro is a very stand up company willing to help out. This has me worried though since I'm just about to install a block from Inline Pro that showed up last week

 

Reading this thread it "sounds like" the Inline Pro rebuild caused this problem and they are scurrying to correct it as they should.

-- Chuck

 

Improper ring gap was my first assumption as well. Or a deck plate wasn't torqued down to simulate the head being torqued down when they cut/honed the cylinder walls. This could lead to out of round cylinders.

 

Inline Pro, the entire crew there, have been awesome to work with. They’ve been attentive, communicative and patient with all my questions during this process. They even fed me lunch (grilled steak!) while I was there with them on Friday. What I’m trying to say is, they certainly aren’t some shady group that is trying to stick me with a bad motor. Even if something goes wrong with your block, they’ll help out.

If I were you, I’d do a baseline leakdown test on your motor and compression when you can. I’d repeat those tests a few times as you break in the motor over the first 500 miles or so... just in case.

 

Seems like a mechanical issue to me... just my opinion. You REALLY have to f-up the tune to damage our stout (stock) engine such as F22 (more reliable than F20).

Also, to me these ID or Ignition Coil guesses are exactly that, random guesses and highly unlikely.

We can eliminate some/most of tune unknowns with the original/break-in tune map, which I hope you have on hand. I can take a quick look at the trigger settings, coil dwell, knock sensor frequency, protection algorithm (setup) safety, so how and when it was supposed to alert you if at all, and finally your fuel & spark maps.

Edit:
1. Hard to see in photos but is there any sandblasted look to your pistons? That’ll suggest knock/detonation event.
2. Do you see any peppering/popcorn on your failed cylinderS spark plugs? Again, that’s a sign of knock/detonation. Those popcorn looking things are melted aluminum of off your piston.

I’m still thinking it’s hardware (ring end gap too tight) and might not be tune related.

 

Id like to have seen what the spark plugs looked like when pulled on those two cylinders, if they were wet or not. Break in is crucial. If you had a couple coil packs that were tired and not firing normally you could fuel wash the cylinders and this would be the aftermath. Not seeing any signs of detonation on the pistons pictured. If your running the factory ecu then yes id assume the coil packs if failing enough to cause fuel wash would throw a code and the engine would also be quite apparent at running rough. So if the engine was running smooth and felt it was firing on all cylinders then this is not likely the culprit and so far seems more likely to point to a mechanical issue within the engine itself.

Tuner shops are always your best friends, all fuzzy and great until they realize they just ****ed up and have to build a new motor for you. To the OP, don't let some free BBQ and friendly buddy banter among the guys persuade or color your judgment on how Inline pro decides to deal with this. Chances are they will go out of their way to do the right thing here, as they have a big reputation to to live up to and word travels fast these days, but sometimes 5k+ has a tendency to interject poor judgment. Hearing about your comments about how great these guys were and giving you food etc just brought back bad memories for me many years ago from a local reputable shop that blew my engine with a shit tune that was absolutely their fault and they knew it, and all those great guys suddenly turned into total dicks and washed their hands clean of me.