Therefore, there's no "setting the timing" in the way you're likely thinking.
If you're experiencing problems related to ignition timing (poor performance, misfires, rough running), the issue lies within the engine's control system, not a mechanical timing adjustment. Troubleshooting steps include:
* Check for diagnostic trouble codes (DTCs): Your 1987 Chevy likely has a way to retrieve codes from the ECM (often using a paper clip trick, or a scan tool). These codes will point you towards the source of the problem.
* Inspect the ignition system: Ensure all ignition components are functioning correctly, including:
* Ignition coil: Check for proper voltage and spark.
* Spark plug wires: Look for cracks, damage, or incorrect routing.
* Spark plugs: Inspect for wear and fouling. Consider replacing them if needed.
* Crankshaft Position Sensor (CKP): A faulty CKP sensor will cause major timing issues and is a common culprit.
* Throttle Position Sensor (TPS): An inaccurate TPS can affect the timing indirectly by providing false information to the ECM.
* Check the ECM: The ECM itself could be faulty. This is less common but possible.
* Consult a repair manual: A factory service manual will provide detailed diagnostic procedures and specifications for your specific engine.
If you're not comfortable working on the engine's electronics, it's best to take your vehicle to a qualified mechanic. Attempting to adjust anything beyond basic maintenance (like spark plugs) without proper knowledge could cause more damage. Remember, you're dealing with a computer-controlled system, and improper interference can lead to serious problems.
