Basic checks include proper fuel pressure, delivery of fuel by the injector, and the amount of injector ON time. Common fuel related problems include blocked fuel line or filter; inoperative fuel pump; incorrect system fuel pressure; defective, dirty, or sticking injectors; and contaminated fuel.
A computer-controlled ignition system consists basically of a pickup sensor and the device it is sensing, engine computer-timing circuitry, an electronic ignition-control module, ignition coil(s), and connective wiring. The first thing to check in the ignition system is whether spark is coming out of the plug wirer then work back from this point. launch automotive scanner
Common ignition-related problems include fouled or faulty spark plugs, defective distributor cap or rotor, open or shorted ignition coil(s), defective high-voltage cables, faulty pickup sensor, defective electronic ignition-control module, and bad connections.
The mechanical system includes such nonelectrical components as vacuum hoses, intake air system, exhaust system, engine head and block, belts, oil pump, camshaft, crankshaft, timing chain or belt, nuts, and bolts. Mechanical problems can often be spotted by a good visual inspection.
In fact, a visual inspection should always be the first step in troubleshooting any system. A seemingly unrelated mechanical problem such as a cracked or disconnected vacuum hose can have a direct impact on the performance of the system.
The electronic control system consists basically of the computer or electronic control module, engine wiring harness, input sensors, and output actuators. The electronic troubleshooting principles used are similar to those used on other automotive electrical and/or electronic systems.