Two problems related to engine have been reported for the 2005 Toyota 4Runner. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2005 Toyota 4Runner based on all problems reported for the 2005 4Runner.
V8, 4wd. Idle rpm is way too high. When a/c compressor kicks in idle can be as high as 1500 rpm. Have to be very careful pulling into garage, as the brake is very difficult to modulate at that rpm. Twice into dealer for this and told ". . . It is normal". Wife afraid to drive into the garage and I have to be very aware when a/c is on. Have never seen a vehicle idle at this high an rpm. Difficult to hold at stop sign and will idle away at a good pace with no accelerator applied.
While stopped, my 2005 4runner moves forward when compressor engages. The rpm at idle will fluctuate between 750 and 1100. During the later portion of fluctuation, abnormal brake pressure is needed to keep the 4runner from moving forward. Idle speeds can reach 25 mph on flat surface and 45 on moderate slope. If you are cruising at 60 mph and remove pressure from accelerator, vehicle idle will retain 55 mph. Toyota claims this is normal. Please investigate before this causes a severe accident. If you forget to apply massive force to brake pedal while stopped. . . Someone may idle through an intersection.