Check the fuel system:
1. Fuel Lines and Filter: Ensure that the fuel lines are free of any blockages or corrosion, and replace the fuel filter if necessary. Some newer vehicles equipped with engines not compatible with ethanol have been known to have fuel lines degrade faster.
2. Fuel Pump: Verify that the fuel pump is functioning correctly and delivering fuel to the engine.
3. Fuel Injectors or Carburetor: Clean the fuel injectors or carburetor (depending on your engine type) to eliminate any potential clogging.
Check the Ignition System:
4. Spark Plugs: Replace the spark plugs with new ones compatible with ethanol-blended fuel. Ethanol requires different spark plug heat ranges than gasoline.
5. Spark Plug Wires: Ensure that the spark plug wires are in good condition and securely connected to the spark plugs and distributor.
Test the Fuel System:
6. Fuel Pressure: Use a fuel pressure gauge to ensure the fuel pressure is within the recommended range specified in your vehicle's manual.
Inspect the Air Intake System:
7. Air Filter: Clean or replace the air filter to ensure there is no obstruction in the airflow.
Check the Emissions System (if equipped)
8. Catalytic Converter: If your vehicle has a catalytic converter, inspect it for any damage or contamination. Ethanol can damage catalytic converters over time.
9. Oxygen Sensors: Ensure the oxygen sensors are functioning correctly to allow the engine to adjust the air-fuel mixture when using ethanol.
General maintenance:
10. Coolant and Fluids: Make sure the coolant level and other fluids such as oil and transmission fluid are at the appropriate levels.
Test the vehicle:
- After completing all the above steps, try starting the vehicle and see if it runs smoothly.
Remember that these suggestions are general steps, and the issue might require professional assistance. If you are unsure about any of these steps or if the problem persists, it's best to consult with a qualified mechanic who specializes in older vehicles like your 1978 Chevy pickup to properly diagnose and fix the issue.
