If it runs good and it does not have a gas vapor leak, but the dash warning light is on, we do a partial test called a Scanner test.. Code reading is easy & free.
If it runs bad, starts poorly, stalls or has failed E-check, we perform a Complete Engine Analysis and Scanner Test.. It includes a scanner test, a fuel pressure test and a sensor waver-form test. If it has a gas vapor leak, we perform a gas cap test, a solenoid / sensor test and an EVAP smoke leak test.
There are intermittent and random electrical problems that require a Circuit Test.
There are 4 systems to test using 7 pieces of equipment.
- Ignition = spark plugs, plug wires, coils and several sensors.
- Computer & Sensors = oxygen, mass air, crank, & throttle.
- Fuel & Emissions parts = valves, solenoids, injectors & etc.
- Engine and Transmission = mechanical & electrical parts.
There are 3 types of engine performance problems.
Constant = this problem is always there and can be described easily
Intermittent = this problem occurs once in a while, but you know how to describe the conditions, like stalling on a cold engine.
Random – THE WORST = occurs under all types of conditions and requires a Full Analysis and maybe a circuit test.