10. With normal start, idle speed too fast Common trouble location: 1. Throttle body and idle speed by-pass air way; 2. Vacuum pipe; 3. Idle speed regulator; 4. Coolant temperature sensor; 5. Ignition timing Diagnosis Flow Table 1-76 98 S/N Operation Test Results Actions 1 Check if the accelerator cable is locked or over tightened. Yes Adjust No Next step 2 Check the air intake system and the connected vacuum pipe for leakage. Yes Check and repair air intake system No Next step 3 Remove the idle speed regulator. Check the throttle body, idle speed regulator, and idle speed by-pass air way for carbon deposition.
Yes Wash relevant parts No Next step 4 Disconnect the coolant temperature sensor and start the engine. Check the idle speed of the engine. Is it too fast? Yes Replace sensor No Next step 5 Check if the ignition timing of the engine can meet with standards. Yes Next step No Check and repair ignition timing 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 No Check and repair relevant line