Symptom Checks

Check the following items:

• Perform QUICK TEST. See the TESTS W/CODES - EEC-IV article. If code is present, use appropriate CIRCUIT TEST.
• Check radiator electric cooling fan operation (if equipped). Start engine. Turn A/C on. Cooling fan should be on.
• If cooling fan does not operate, go to step 21) of CIRCUIT TEST XB in the TESTS W/CODES - EEC-IV article.
• Check base timing. See the ADJUSTMENTS article.
• Check gauges/senders.
• Check for brake drag.
• Check transmission for overheating.
• Check for core sand in engine block.
• Check for internal cylinder block and cylinder head leaks.