As some of you know, about 8 months ago I discovered oil in my spark plugs tubes, both cylinder banks, which prompted me to take the car into a Toyota dealership for repair, here is a thread documenting what happened and how it was resolved:
forum.ih8mud.com
Fast forward to today - 8 months after the repair, and 4 months short of the 1 year warranty on the job expiring, I decided to pull all of the plugs again to MAKE SURE there was no oil prior to the job warranty expiring and GUESS WHAT, there is oil on the 3rd spark plug on BOTH cylinder banks when counting from front to back of the car. The car experiences no symptoms, the engine idles perfectly smooth, no misfires etc, but those two cylinders have significant oil in them. The car will be going back to the shop, and more than likely will have to have the massive job of removing both valve covers, and replacing ALL gaskets all over again.
Questions for the PROs here:
Any idea on how this could happen ? - Maybe they did not clean the surface correctly where the seals are located ?
One concern here is that since this is a massive job, last time around the techs broke the plug for the cam positioning sensor, which had to be replaced, - new clip crimped into the end of the wiring harness etc. I am concern that more things will be broken by them repeating this massive job, what do you guys suggest here?
Thanks,
2010 GX 460 oil in Spark Plugs
So I recently purchased a used 2010 GX 460 with 150k on the clock and while it did have most of the maintenance done at Lexus , the spark plugs were never changed. Today I went ahead and replace them all and noticed that two of them, (one on each cyclinder bank - passenger and driver ) were...

Fast forward to today - 8 months after the repair, and 4 months short of the 1 year warranty on the job expiring, I decided to pull all of the plugs again to MAKE SURE there was no oil prior to the job warranty expiring and GUESS WHAT, there is oil on the 3rd spark plug on BOTH cylinder banks when counting from front to back of the car. The car experiences no symptoms, the engine idles perfectly smooth, no misfires etc, but those two cylinders have significant oil in them. The car will be going back to the shop, and more than likely will have to have the massive job of removing both valve covers, and replacing ALL gaskets all over again.
Questions for the PROs here:
Any idea on how this could happen ? - Maybe they did not clean the surface correctly where the seals are located ?
One concern here is that since this is a massive job, last time around the techs broke the plug for the cam positioning sensor, which had to be replaced, - new clip crimped into the end of the wiring harness etc. I am concern that more things will be broken by them repeating this massive job, what do you guys suggest here?
Thanks,