Troubleshooting Hints

Hint 1:
If the engine is hard to start when hot, check fuel pressure and check the injector for leaks.

Hint 2:
If the injector does not operate when the engine that is hard to start is cranked, the following as well as the injector itself may be responsible:

1. Faulty power supply circuit to the Engine Control Module, faulty ground circuit
2. Faulty MFI Relay
3. Faulty Crankshaft Position Sensor, Camshaft Position Sensor

Hint 3:
If there is any cylinder whose idle state remains unchanged when the fuel injection is cut to that cylinder, make the following checks about such cylinder:

1. Injector and harness check
2. Ignition plug and high tension cable check
3. Compression pressure check

Hint 4:
If the injector harness and individual part checked good but the injector drive time is out of specification, the following troubles are suspected:

1 Poor combustion in the cylinder (faulty ignition plug, ignition coil, compression pressure, etc.)
2 Loose EGR Valve seating
3 High engine resistance