3. Difficult to start after warm-up Common trouble location: 1. Fuel with water; 2. Fuel pump; 3. Coolant temperature sensor; 4. Fuel pressure regulator vacuum pipe; 5. Ignition coil. Diagnosis Flow Table 1-69 90 S/N Operation Test Results Actions 1 Connect the fuel pressure gauge (the connection point is the front end of the intake pipe of the fuel distribution pipe assembly), and start the engine. Check if the fuel pressure of the engine under full working condition is about 350kPa. Yes Next step No Check and repair fuel supply system 2 Draw out the wire of one of the cylinders, and connect with the spark plug. Keep the electrode of the spark plug about 5mm from the engine body.
Start the engine, and and check if the blue white high voltage fire is produced. Yes Next step No Check and repair ignition system 3 Disconnect the coolant temperature sensor, and start the engine. Is it OK? Connect a 300Ω resistance in series at the connection point of the coolant temperature sensor to replace the sensor, and start the engine. Is it OK? Yes Replace sensor No Next step 4 Check the fuel pressure regulator vacuum pipe for looseness or leakage. Yes Check, repair or replace No Next step 5 Check the fuel for normal operation. Yes Replace fuel No Next step 6 Connect the electronic injection system adapter. Turn on the ignition switch.
Check the power supply of the pin 12#, 13#, 44#, 45#, 63#. Check the grounding of the pin 3#, 51#, 53#, 61#, 80#. Are they OK? Yes Diagnosis help