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BASIC HOT START SYMPTOMS TROUBLE SHOOTING CHART BASIC COLD ENGINE DRIVEABILITY SYMPTOMS TROUBLE SHOOTING CHART BASIC WARM ENGINE DRIVEABILITY SYMPTOMS TROUBLE SHOOTING CHART Hot fast idle RPM too low Reset fast idle RPM, see TUNE-UP CONDITION & POSSIBLE CAUSE CORRECTION Engine Won't Start Engine flooded Allow fuel to evaporate CONDITION & POSSIBLE CORRECTION Engine Stalls in Gear Choke vacuum kick setting Reset choke vacuum kick, see FUEL SYSTEMS Fast idle RPM incorrect Reset fast idle RPM, see TUNE-UP Fast idle cam index incorrect Reset fast idle cam see FUEL SYSTEMS Acceleration Sag or Stall Defective choke control switch Replace choke control switch Choke vacuum kick setting Reset choke vacuum kick see, FUEL SYSTEMS Float level incorrect (too low) Adjust float level, FUEL SYSTEMS Accelerator pump defective Repair or replace pump see FUEL SYSTEMS Secondary throttles not closed Inspect lockout adjustment, see FUEL SYSTEMS Sag or Stall After Warmup Defective choke control switch Replace choke control switch, see FUEL SYSTEMS Defective accelerator pump Replace pump, see FUEL SYSTEMS Float level incorrect (too low) Adjust float level, see FUEL SYSTEMS Backfiring & Black Smoke Plugged heat crossover system Remove restriction CONDITION & POSSIBLE CAUSE CORRECTION Hesitation With Small Amount of Gas Pedal Movement Vacuum leak Inspect vacuum lines Accelerator pump weak or inoperable Replace pump, see FUEL SYSTEMS Float level setting too low Reset float level, see,FUEL SYSTEMS Metering rods sticking or binding Inspect and/or replace rods, see FUEL SYSTEMS Carburetor idle or transfer system Inspect system and remove restriction
1998 Chevrolet Pickup C1500 GENERAL INFORMATION Trouble Shooting - Basic Procedures
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