How do you set timing on a 98 Chevy 350 vortex?

Setting the timing on a 1998 Chevy 350 Vortec engine is significantly different than older, non-computer-controlled engines. You cannot set the timing in the traditional way using a timing light. The engine's computer (PCM) controls the ignition timing dynamically based on various engine sensors. Attempting to adjust the timing using a distributor will likely damage the system or cause the engine to run poorly.

Instead of adjusting the timing, you should focus on:

* Diagnosing any problems: If you suspect a timing issue, the problem is almost certainly *not* the timing itself but rather a malfunctioning sensor or component that the PCM is relying on. Common culprits include:

* Crankshaft Position Sensor (CKP): This sensor is critical for proper ignition timing. A faulty CKP will cause a misfire or no start.

* Cam Position Sensor (CMP): Similar to the CKP, a faulty CMP will lead to timing-related problems.

* Mass Airflow Sensor (MAF): An inaccurate MAF reading will affect the air/fuel mixture, indirectly impacting timing.

* Throttle Position Sensor (TPS): Incorrect TPS readings can disrupt the PCM's control.

* Using a scan tool: A scan tool capable of reading OBD-II codes is essential. It will identify any trouble codes (DTCs) stored by the PCM, pointing to the faulty component(s). The codes often directly relate to the sensor problems listed above.

* Professional diagnosis: If you're not comfortable diagnosing and repairing automotive electrical systems, it's best to take your vehicle to a qualified mechanic. Incorrectly diagnosing and attempting to fix a timing-related issue can cause serious damage to the engine.

In short: There's no timing adjustment on a 1998 Chevy 350 Vortec. Focus on diagnostic testing using a scan tool to identify and repair the underlying problem.