I learned this on my Lil’ 1982 Pontiac J-2000 coupe that taught me a whole lot on how valuable the repair manual really is to have for the correct vehicle. It told me about computer codes, wiring specs, tools needed, electrical for body and chassis, so much to learn from! Repair manuals have it all and then some! After my experience with my little Pontiac and it’s repair manual I started wanted to learn from other repair manuals on other cars!
My thirst was crazy drooling for more info on any car I could find to fix next! The next car I worked on with a repair manual was a 1985 Chevy Monte Carlo V-6 that belonged to a friend of my wife that she had met in New Zealand who was actually from Germany. He left it with me to tune the car up and anything else the car might need before he took it up to Pinedale, Wyoming from Salt Lake City, Utah. So he left it with me to drive around. What a sweet car, she was loved, that one!
Then some years went by until I started working for myself and started working on other peoples’ cars. If I ever had doubts about something related to the car I was working on, I would strongly suggest for them to buy a repair manual for the vehicle. This saves ME AND THEM time, money, headaches and the hassle of guessing the problem or even driving time to the parts store or a shop dealer with maybe no results. Because not all things can be found through the computer on today’s cars.