What’s eating this coil/ plug

skyhighZJ

skyhighZJ

Gov retirement < needs to live
Joined
May 31, 2012
Location
Aberdeen, NC.
2000 4.7 V8 tundra dude says it feels like it drops a cylinder under load but seems to idle fine. Question is:
1.) replace parts and roll out

Or

2.) dig deeper cause something fucky is causing it
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wow

I have never seen that before
 
That looks like severe spark erosion from the plug being loose probably, combined with some combustion leakage. The leakage is what melted the coil pack probably.
I don't want to know what the head looks like.
 
Fabrik8 said:
That looks like severe spark erosion from the plug being loose probably, combined with some combustion leakage. The leakage is what melted the coil pack probably.
I don't want to know what the head looks like.
Click to expand...

This is kind of what I’m thinking was the culprit. It’s not in front of me. A friend of mine is working on it over in Tx. I said I would reach out to the encyclopedia (NC4x4) for recommendations.
 
It's interesting that the electrode and ground strap aren't melted and don't really look that bad for color, etc. That means it's likely not a overly lean condition. I could see the spark not igniting properly under load when the combustion pressure rises, but it doesn't look overly fouled with fuel either.
 
Last edited:
Fabrik8 said:
It's interesting that the electrode and ground strap aren't melted and don't really look that bad for color, etc. That means it's likely not a overly lean condition. I could see the spark not igniting properly under load when the combustion pressure rises, but it doesn't look overly foulwd with fuel either.
Click to expand...

Insulator failure and burn out?
 
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