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Have a 1991 Toyota 4 runner that will not start have put new fuel pump and injectors it still wont start?

1. Check the fuel pressure. The fuel pressure should be between 40 and 50 psi (pounds per square inch). If it is too low, the engine will not get enough fuel to start.

2. Check the spark. Remove one of the spark plugs and hold it close to the engine block with the ignition on. If you see a spark, the ignition system is working properly.

3. Check the timing. The timing is essential for the engine to run properly. If the timing is off, the engine will not start.

4. Check the compression. The compression should be between 150 and 200 psi. If it is too low, the engine will not have enough power to start.

5. Check the wiring. Check all of the wiring to make sure it is connected correctly and not frayed.

6. Test the battery and alternator. The battery and alternator must be in good condition for the engine to start. If the battery is dead, you can jump-start the engine. If the alternator is bad, you will need to replace it.

7. Check the ECU. The ECU (engine control unit) is a computer that controls all of the functions of the engine. If the ECU is bad, it must be replaced.

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