Even if you're on a budget, get the factory manual. It will pay for itself over and over. The troubleshooting information is so much better than anything else.... You can go to techinfo.toyota.com and join up for one day and download the entire manual if you want, and that would be cheaper than buying one. That's what I did. I just print out what I need now. Since you're an 81, it might be unavailable online, though. Can't remember how far back they go.