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Why might a 1989-1990 Mitsubishi Triton not start after changing the engine?

There are several reasons why a 1989-1990 Mitsubishi Triton might not start after changing the engine. Some common causes include:

1. Fuel System Issues:

- Check if there is proper fuel flow to the engine. Make sure the fuel lines are connected correctly, and there are no leaks or obstructions in the fuel line. Ensure that the fuel pump is functioning properly and delivering sufficient fuel pressure.

2. Electrical Issues:

- Verify that all electrical connections related to the engine are secure. Check for any loose or damaged wiring, connectors, or sensors that could disrupt the electrical signals required to start the engine. Ensure the battery is properly connected and has sufficient charge.

3. Air Intake Issues:

- Make sure the air intake system is correctly connected and free of blockages. Check the air filter for any obstructions and clean or replace it if necessary.

4. Spark Plugs and Ignition System:

- Inspect the spark plugs to ensure they are properly gapped and not damaged. Verify if there is a spark by removing a spark plug and grounding it against the engine block while someone tries to start the vehicle.

5. Timing Belt or Chain:

- Incorrectly installed timing belts or chains can prevent the engine from starting properly. Ensure that the timing components are aligned correctly and the timing marks are aligned as specified in the vehicle's service manual.

6. Engine Sensors:

- Some engines rely on sensors to manage fuel injection and ignition timing. Check if there are any disconnected or faulty sensors that could be preventing the engine from starting.

7. Engine Control Unit (ECU):

- If your Triton has an ECU, it may need to be reprogrammed or replaced if it was not correctly reconnected during the engine change.

8. Engine Mechanical Issues:

- Rare but possible, there might be a mechanical issue with the new or rebuilt engine itself, such as incorrect valve timing, a damaged camshaft, or other internal engine problems.

If you have checked and addressed all of these potential issues and the engine still does not start, it's recommended to seek assistance from a qualified mechanic who can diagnose the specific problem and provide the necessary repairs.