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Could anybody take a look at the picture below and comment ? Thanks in advance.
Seems to me that only #7 is bad, with the electrode burnt / lower than the others. Measured the gap and they were all .038 - 0.039" except #7 which was .079".
Car is a 2008 Z07, has a Katech Torquer 110 cam, ported heads, runs 94 octane and is tracked a couple of times per year. Around 28k miles. No issues whatsoever running (that I can feel).
Pull the injector and coils on 7, and move them to another location to see if problem follows.
If follows, move the #7 coil back, but leave the #7 injector where it's at. If problem stays with #7 injector location still burning plugs (not a coil or wire problem), then pull injectors to have them bench tested for matching flow rates.
As stated, detonation problem with #7 cylinder that took just that plug out, and could be spark or fuel the problem at hand.
LS7 Spark Plugs read
