Why would you want the blinker faster. They should blink at factory specs.
Buy a "highway" turn signal flasher
Check to make sure all bulbs are working properly
often the blinker is made to blink faster when there is a bulb burned out
That's usually an indication of a burned out bulb.
turn signal relay fuse
your rear bulb is blown - replace the bulb The turn signal blinks fast because the bulb is going out. That is also why the others dont blink.
turn signal relay is bad
Check your bulbs and your flasher.
Probably needs a fuse.
A. check and make sure all the bulbs are working. B. someone may have replaced the blinker itself with a aftermarket one that blinks at a diff rate.
This may very well be a problem with your ground connections at that turn signal.
If your blinker is blinking at a faster rate than normal, it usually means that one of the bulbs is out. For example, if the left turn signal blinks faster than usual, check either the front or the rear left turn signal. If both turn signals seem okay, check the front left parking light. (this is the front orange light that is on when your headlights are on)