Symptom Checks

Perform the following:

• Check if engine will start with throttle closed. If engine starts, go to CIRCUIT TEST Z in TESTS W/CODES article and check for intermittent causes of no-start condition.
• 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 TESTS W/CODES article.
• Check ignition and fuel system. See CIRCUIT TEST A in TESTS W/CODES article.
• Check for restricted exhaust system. See CIRCUIT TEST HF in 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 TESTS W/CODES article and check for intermittent faults.