The “check engine” or “service engine soon” light is a very important part of your vehicle’s performance, dependability and capability for lowering emissions. Early vehicles required a tune-up every 5,000 to 15,000 miles. But tuning a vehicle made in the last 20 years is just not done anymore. It’s a “past” term. Tuning a vehicle used to be like being the conductor of an orchestra, making sure that each and every instrument was played at the correct instant, right volume and length of time -- timing being critical. In the tuning of engines, it was making sure that every cylinder was doing its part, and that the spark of each spark plug was delivered at precisely the correct time with the proper intensity. Checking all this on a scope – firing times, voltage potential, fuel delivery -- was a very difficult job. Few knew how to do it thoroughly. The modern vehicle is an incredible piece of equipment, and is the most advanced techn ... read more