On it goes, the Highlander has been at the dealer for 15 days now.
Well, I need to update this story. Schaumburg Toyota thought it was ok to change only the timing chain, and not the sprockets. They also put 5 quarts of oil in the engine, 1 extra for good measure, I guess. I drained out the 5th quart of oil the next day. A couple of days after taking the Highlander home, the whirring noise from the engine got progressively louder. It was returned to Schaumburg Toyota to be fixed again. I showed them in the Chilton manual where it says they have to be changed together as a set, along with the oil pump chain and sprockets. Two weeks later, they say they changed the oil pump ITSELF, sprockets, chains and reassembled it, and it's still noisy. (It never made a sound before they worked on it.) Now they are saying the cam shafts are binding and they need to tear the whole engine down to check for damage. And they found metal shavings in the oil pan. (No chain fragments????) Who knows where this is going? I already have $850 in this "repair." I would NEVER have brought the vehicle in to them if the check engine light hadn't failed the emissions test. And who would have thought the timing chain needed a tensioner pulley, what a goofy design!!! My 1970 383 V8 Mopar double roller timing chain was a precision fit on the cam sprockets. I mounted the sprockets on the cam and crank with the timing chain assembled as a set with no slack at all. The fit was so tight I needed to coat them with engine oil just to slide them together. I asked the customer service guy if the Toyota timing chain had double rollers. He said yes. I am not dealing with experts here!!! SO, what do I do now? The way things are going, I will need a new tranny before the job is over.