120,000 miles recommended service calls for change of spark plugs
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2003 Toyota Highlander Question: How to change spark plugs on V6 model
I FIND NOTHING ON ALL DATA REGARDING DIRECTIONS ON TUNE UP IT MUST BE SELF EXPLANITORY. SORRY
Answer #2luiggyone April 12, 2012, 19:22Rookie
The intake plenum (upper portion of intake manifold) has to be removed to gain access to spark plugs on right side of engine (towards firewall) ;
You need lots of patience and be careful with all the connectors and small coolant hoses under it,it is fairly easy but takes time(labor time). Good luck, hope this info helps...