Could someone help me to diagnose my car problem. My car won't start. Here are the details:
91 Mitsubishi Gallant (4 Cyl with MPI)
- Fuel pumps works fine
- Fuel filter works and is clean
- Injectors have +12 when ignition is on
- Injectors work when manually energized (Ground applied to other legs)
- Spark plugs work and spark are detected in all Cyls when engine cranks
- ECU does not show any visible damage. No capacitor blown up
- Fuel injectors do not energize when engine cranks (no clicking is heard, no vibration felt)
- I manually engaged the injector for 2-3 sec each to inject some gas into manifold and then I cranked the engine. Engine started and ran for 2-4 second. To me it means gas is not being injected by injectors.
- So far I my diagnosis are that the ECU does not energize the injector
- Called local auto guys to check on ECU. It costs over $300 with special order. Cannot returned it if ECU was not cause the problem. I have to be 100% sure before I buy the ECU.
- I am guessing since ECU is sending sparks to the spark plugs, is not damaged at least not completely damaged.
- Could any sensors to ECU be causing not to fire the injectors? Which one?
- So, what could be the problem ?
Thanks Sam