Symptom Checks

Perform the following:

• Check if engine will start with throttle closed. If engine starts, go to CIRCUIT TEST Z in appropriate article and check for intermittent causes of no-start condition:

  For 2.5L vehicles, see TESTS W/CODES - 2.5L .

  For 3.0L vehicles, see TESTS W/CODES - 3.0L .

  For 4.0L vehicles, see TESTS W/CODES - 4.0L .

• Check if engine will start at part throttle. If engine starts, Idle Air Control (IAC) system may be defective. Go to CIRCUIT TEST KE, step 2) in appropriate TESTS W/CODES article.
• Check ignition and fuel system. See CIRCUIT TEST A in appropriate article:

  For 2.5L vehicles, see TESTS W/CODES - 2.5L .

  For 3.0L vehicles, see TESTS W/CODES - 3.0L .

  For 4.0L vehicles, see TESTS W/CODES - 4.0L .

• Check for restricted exhaust system. See CIRCUIT TEST HF in appropriate TESTS W/CODES article.
• Check engine mechanical condition. Check compression, camshaft, valve train components, etc. If no problems are indicated, return to SYMPTOM DIAGNOSIS  to identify any additional symptoms or go to CIRCUIT TEST Z in appropriate article and check for intermittent faults:

  For 2.5L vehicles, see TESTS W/CODES - 2.5L .

  For 3.0L vehicles, see TESTS W/CODES - 3.0L .

  For 4.0L vehicles, see TESTS W/CODES - 4.0L .