Toyota Repair Problems? Ask a Mechanic for Answers ASAP
Thank you for using just answer.
Are you saying that the spark plugs are soaked in oil inside the tubes outside the engine or that the sprk plug tip inside the engine is oil fouling?
YOu have to measure the clearances cold between the valve shim plates and the cam lobes, then specail order any shims if adjustments are needed. I have never seen a corolla from this generation need valve adjustments.