Just recently Ive noticed the engine is starting to make a little intermittent rattle whilst idling, the sound doesnt present itself whilst the car is moving or when its accelerating.
Now, Ive serviced this car since new every 5-7500km and I havent even looked at the owners manual or service booklets once till a few days ago.
Came as a surprise to me when I read that it needs valve clearance adjustments every 40,000km, I thought the 1ZZFE has self adjusting hydraulic lifters, I thought wrong.
Car is almost to 120,000km, never been redlined but it has been involved in a minor collision not long ago which Im sad to inform those of you who have taken an interest to the reliability of my 1ZZFE, other driver pulled out in front, couldnt stop in time, kapow, lucky no one was injured and airbags didnt go off.
Still drives the same though repair quality is so so, looks fine to the average person but recognisable if you know what to look for.
Is it worth doing the adjustments? Can I continue to keep driving just changing oils/filters without too much worry of dropping a valve?
I also havent changed the fuel filters either but have run higher octane fuel since new, do you think it needs the fuel filter changed too?
Cheers for any light that you can shed on my questions.