Timing Chain Question

[SloMo]

Originally Posted by zoidberg444

There is a possibility you have some partially clogged oiling passages in the engine and something isn't getting enough oil at low pressure from idling. I had a problem with my engine sounding loud and the occasional rattle from my timing chain (tensioner or the VVT) and what sounded like a very noisy lifter at idle every now and again. I ran some flush through my engine before an oil change and it hasn't done it for 10,000 miles. I guess some crud might have been blocking something after 160,000 miles/12 years.

Flush. Especially in older engines is really kill or cure though. I could just have easily have wrecked my engine and had to get a new one from the scrap yard.

Toyota timing chains are very very durable. I've only heard of a handful of cases of one going bad.

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Thanks zoidberg! It's due a service too, so I might ask the mechanic about that. I've gotten to the stage where I'm closing the windows on a hot sunny day to keep a keen ear leaning towards the engine noise! It's smoother now, but rougher than it was a few months ago. Negligible difference though. When you say Toyota timing chains are so durable, do you mean it may not need changing for another 100k, or so? Would I get some kind of warning before it goes, like a rattle or a stuttering engine?

Very grateful for all the help by posters!