Four problems related to engine have been reported for the 2004 Toyota Highlander. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Toyota Highlander based on all problems reported for the 2004 Highlander.
My 2004 Toyota Highlander hesitates for a couple of seconds when I accelerate from about 40 to 50 mph such as getting onto a freeway. I have never experienced this in any other vehicle. I find this hesitation to be very disconcerting and makes me worry about merging into traffic.
Excessive sulfur dioxide in 2004 v6 Toyota Highlander, there is already a TSB on the v4, but I own a v6 and have had this problem for almost a year now (stop and go and acceleration, there is a rotten-egg smell). I've been told by 2 Toyota service stations that it is the gas. This is definitely not the case. I've tried every type of gas available.
Engine hesitation and delayed acceleration.
While researching another matter concerning my 2004 Toyota Highlander on your site, I read complaint #10161055 concerning a hesitation problem the owner was having and wanted to say that I have experienced the same problem. It is not constant, however it does happen frequently.