Scanning for misfire – Strange anomaly occurs

[and1y]

Thanks. I’ll check the vacuum system one more time. I have verified using the method above that the coils and plugs are not the problem. Also, the fuel injectors are good as well. What are your thoughts about a little oil being on the spark plug threads? I can’t remember what ones they were, but they weren’t just from the misfiring cylinders. The compression is excellent….and I also did a leakdown test and they were perfect as well. There’s no oil leaking from the valve cover either.

[Schrodinger’s Box]

I would think that a little oil on plugs threads comes under the ‘would’nt help’ category, but you can’t remember which ones so disregard this. If you find them clean up and see if it comes back.
After trying the water trick we can move onto signal strength from the Crankshaft Position Sensor but thats another story and may not be required, along with hydraulic lifters to the valves.

[Author]

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