6.4L Hemi engine issue, need opinion please!!

hal3y_srthal3y_srt Member Posts: 2
edited December 2017 in Jeep
2014 Jeep GC SRT, 65k miles. So, the other day driving down the road, and my engine starts knocking. WTF. Pull over, dipstick read correctly but I drained the oil to make sure the right amount came out, which it did. Refilled the engine with new oil, still knocking. CEL came on, I pulled the code and it was a "Cylinder 8 Misfire". So I figured spark plug, but that doesn't tell me what caused the knocking. Pull the spark plugs from cylinder 8 that night since it was too late to drop off at the dealership, and noticed one of the 2 park plugs for cylinder 8 was broke (the porcelain or whatever material it is), and the other plug, the piston hit it and closed the gap completely on plug. Replaced the plugs, still a knock. Took it to the dealer, they took off the head and noticed bolt indents all over the chamber, which had a fine thread. The actual piston had a piece of metal melted into it.

So my question, how the f*** does that happen? I have an AFE GT Momentum CAI, but I know there is no way it got sucked into the engine from that. No one has had access to my Jeep, and it hasnt had any motor work done to it. The service manager said he didnt see any missing bolts from inside the engine and is saying its a foreign object that either dropped down the spark plug hole (impossible) or someone put the bolt in my intake (99.999999% impossible). Is there anyway a bolt could break off from inside the engine and cause that? Im lost on this one and completely stumped. Anyone have any opinions?? An inspector is coming Tuesday to come look at it to decide if it will be covered under warranty or not but the technician highly doubts it will be covered

Comments

  • Mr_ShiftrightMr_Shiftright Sonoma, CaliforniaMember Posts: 64,482
    That's going to be a tough one to solve. Obviously, something DID enter the combustion chamber that wasn't supposed to be in there, and really, the intake manifold would by the only logical choice for the intruder.

    Normally when a spark plug is hammered like that, it's usually due to severe detonation, which caused a piston to "chunk out", and this chunk is what does the damage.

    But is certain it was a bolt? Are you convinced from seeing the damage that that is what it was? Did you examine the upper cylinder head for anything unusual?

    I'm concerned that they will try to pin this on your CAI, because you no doubt removed the stock air box. Your CAI is not some cheap piece of junk, however, and there doesn't seem to be anything on it that could do this.

    If the bolt itself could be identified, that might lead to some conclusions, but it's possible this is going to be one of those finger-pointing-in-a-circle kind of situations.

    Good luck with it.
  • hal3y_srthal3y_srt Member Posts: 2

    That's going to be a tough one to solve. Obviously, something DID enter the combustion chamber that wasn't supposed to be in there, and really, the intake manifold would by the only logical choice for the intruder.

    Normally when a spark plug is hammered like that, it's usually due to severe detonation, which caused a piston to "chunk out", and this chunk is what does the damage.

    But is certain it was a bolt? Are you convinced from seeing the damage that that is what it was? Did you examine the upper cylinder head for anything unusual?

    I'm concerned that they will try to pin this on your CAI, because you no doubt removed the stock air box. Your CAI is not some cheap piece of junk, however, and there doesn't seem to be anything on it that could do this.

    If the bolt itself could be identified, that might lead to some conclusions, but it's possible this is going to be one of those finger-pointing-in-a-circle kind of situations.

    Good luck with it.

    I actually went down to look at it and yes its 100% a bolt imprint. Clear as day. I have had the CAI for years now and changed the filter like 4 months ago and I know I didnt drop a bolt in it. The cylinder wall was torn up, the piston has a hole in it and there are bolt imprints everywhere on the block, top of the piston and the head. But I know I didnt just drop a bolt in my intake and I know it didn't come from my intake. And I think the finger pointing will start, which is why im trying to gain some knowledge on it to see if its possible that a bolt broke off from inside and could make its way up there.
  • isellhondasisellhondas Issaquah WashingtonMember Posts: 20,350
    This could get interesting. I know some manufactures are anti anything aftermarket.
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