Surges/Chuggles

SURGES AND/OR CHUGGLE - Definition: Engine power variation under steady throttle or cruise. Feels like vehicle speeds up and slows down with no change in throttle position.
^ Check misfire counts using Scan tool (if any exist)
^ Verify proper TCC operation and customer understanding of TCC.
^ Verify proper A/C clutch operation.
^ Monitor block learn values on Scan tool if system is running lean (block learn near 147).
^ Monitor block lean values on Scan tool if system is running rich (block learn near 101).


Check:
^ EGR Operation
^ Generator output voltage
^ Vacuum lines for kinks or leaks
^ Fuel filter and fuel pressure
^ Spark plugs for cracks, wear, burned or heavy deposits on electrodes
^ Fuel quality.