- Bosch Double Iridium Spark Plugs 96310
- NGK Laser Iridium Spark Plug 96964 DILKAR7H11GS
- Denso Iridium Long Life Spark Plug 3492 DXE22HQR-D11S
I likely have either another bad coil or some other 'wiring' issue or, the spark plug itself is becoming marginal. At ~85K miles it is time for new plugs anyway so, that took me down that rabbit hole!
Is there anything to suggest one of these spark plugs or a different model is better or significantly cheaper with essentially the same performance and longevity? The misfire sometimes is completely gone and sometimes is present. It generally is more prevalent when cold but, also occurs after getting fully warmed up. It will 'skip' occasionally or continuously cut out at ~3200RPM like a LIMP Mode is kicking in. With this intermittent nature of the miss, I am a bit puzzled as to the true cause and source of the issue. This takes me to coil-on-plug #4 again with new spark plugs.
With spark plug installation, do I need to do anything special like anti-seize on the plug threads or something else? It looks like torque is generally recommended at 11-14ft/lbs so, anything else to be aware of or consider?
I'm open to other possible causes and things to look at but, spark plugs seem reasonable at this point so I'm starting there with almost anything else I do. What am I possibly overlooking with this intermittent misfire?