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Fuel not accepted smoothly

Step 1: Is ignition system in proper condition?

Check battery voltage, ignition distributor, spark plugs, ignition coil, ignition timing, etc.

  • Yes: Go to Step 2
  • No: Repair or replace damaged ignition components

Step 2: Is engine in proper mechanical condition?

If the fuel acceptance is still poor after the electrical test, check for mechanical problems: Compression, basic adjustment of valves and engine oil pressure.

  • Yes: Go to Step 3
  • No: Repair or replace damaged components

Step 3: Is the throttle valve switch set coorectly?

  • Yes: Go to Step 4
  • No: Adjust switch

Step 4: No leaks in air intake system, system in proper condition?

See "Engine does not start" Step 8.

  • Yes: Go to Step 5
  • No: Repair leaks

Step 5: Is the auxiliary air device in proper mechanical condition?

Visual check of the auxiliary air device: in the cold condition the auxiliary air device must be partly open, but when the engine is warm it must be closed.

  • Yes: Go to Step 6
  • No: Replace auxiliary air device

Step 6: Is the air flow meter in proper mechanical condition?

For testing, see under "Engine does not start" under Step 9.

  • Yes: Go to Step 7

Step 7: Is composition of exhaust gas (concentration of CO) correct?.

See Test Chart for value.

If the concentration of CO is too high, turn the bypass screw in the air flow meter 1/2 turn counterclockwise. Measure the speed and the concentration of CO again. Make corrections in several steps.