hello everyone i am new to the forum and i need help finding out how to adjust the igniton timing i had a friend of mine who was the head mechanic at lexas change the timing belt on my toyota corolla 1991 and since he changed it it has idled higher than it usually did. he didnt check the timing because he didnt have a light but i do so i was wondering how do i check the timing and if someone can give me some instructions and possibly include some pictures i would be very greatful. thank you for taking the time to read this.
anyways if it was a about 10 degrees too fast how much would that affect fuel economy