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Home >> Mercedes Benz >> 1972 >> 220 Standard Trans >> Repair and Diagnosis >> Engine Mechanical >> Fuel System >> STROMBERG Cd Type 1-Barrel >> Trouble Shooting

Trouble Shooting

  1. Incorrect fuel level caused by maladjustment of floats or worn or dirty needle valves. Check float level. Wash needle valve in clean gas, replace valve if worn.
  2. Piston sticking. Check free movement of spring loaded metering valve needle. Clean piston rod and guide. Lubricate rod and guide with a few drops of oil.
  3. Metering needle incorrectly fitted. Check that shoulder of needle is flush with face of piston. Check that correct needle is fitted. Check that needle housing has not been distorted by overtightening of screws.
  4. Partially or fully obstructed diaphragm ventilation holes. Check air cleaner element and casing are correctly fitted, and that carburetor air horn gaskets are not causing obstruction.
  5. Diaphragm incorrectly fitted or damaged. Check location with vacuum chamber cover removed. Two depression holes at base of piston should be in line with and towards throttle spindle. Replace diaphragm if damaged.
  6. Throttles not synchronized. Reset correctly using a balance meter.
  7. Hesitation or Flat Spot. Damper inoperative. Check the oil level, if necessary top off with light engine oil. Check to see that piston return spring has not been omitted.
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