P1345 Diagnostic and Rotor Alignment Fix for 1998 S10 4.3L V6

For owners of a 1998 Chevrolet S10 with a 4.3L V6 engine experiencing fault code P1345, proper rotor alignment is critical. The rotor must be positioned so that it points to the start of cylinder #1 spark plug tunnel beneath the distributor cap — not where the wire exits the cap. This design is known as a crossfire configuration, and many users mistakenly install it 180 degrees out, which can cause intermittent engine misfires or poor performance. To verify correct alignment, remove the valve cover and confirm that the rotor is seated properly on compression stroke. This physical check ensures accurate positioning. Most standard OBD2 scan tools do not provide degree-based timing readings; such functionality is typically found in professional-grade diagnostic equipment. However, if your tool supports degree measurements, set it to 0 degrees for proper synchronization. For visual guidance, refer to the Wellsmfg YouTube channel, which offers clear tutorials on distributor rotor alignment and engine timing procedures.