Originally Posted by Big D
No, in The Motion Picture
they wait to clear the solar system because the ship's been refurbished. There've been heavy modifications to the warp drive, and they want to be safely away from our planet in case something goes catastrophically wrong when they fire up the most powerful, space-distorting, antimatter-guzzling power source known to exist
I'm pretty sure Kirk said in his log:
"In order to intercept the intruder at the earliest possible time, we must now risk engaging warp drive while still within the solar system."