paulmars Posted June 12, 2021 Share Posted June 12, 2021 See spark plug images. 5 of the six plugs look like the 1st two images below https://imgur.com/gallery/HWxojWN and https://imgur.com/gallery/HNsRAML questionable plug is in these three images: https://imgur.com/gallery/4cxiIIA and https://imgur.com/gallery/5hdPUH9 and after removal and replacement, then sat for 24 hours(was not driven): https://imgur.com/gallery/0wPFTvK See the electrode crud and oil on threads. It looks like even more oil after removal and replacement. One plug only. Is there issue with that cylendar? 2007 Engine 2gr fe with 190k miles Quote Link to comment Share on other sites More sharing options...
Toyota Owners Club Posted July 6, 2021 Share Posted July 6, 2021 The oil on the plug thread could possibly be where the valve cover is leaking / weeping oil and tracking down the plug bore when removed. The best thing to do is to ensure the electrode gaps are perfectly set to the correct clearance and then torque down the plugs evenly. This ensures that the thread is not stretched due to over-tightening (which marginally increases the electrode gap) and also the spark is not putting excess strain on the coils by trying to fire the spark over an excessively large gap. It also wouldn't do any harm to run a cylinder compression test whilst the plugs are out to determine if there is an issue with one or more cylinders. Quote Link to comment Share on other sites More sharing options...
paulmars Posted July 6, 2021 Author Share Posted July 6, 2021 no oil on section of plug that sits outside the combustion chamber. Quote Link to comment Share on other sites More sharing options...
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