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Cold start (starting)
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Warming up (stalling after cold start)
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Cold idle (speed too high/too low)
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Cold driving characteristics/transition cold (pick-up poor,
jerking)
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Automatic choke cuts out incompletely or late
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Warm start (starting time over 5 secs)
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Idle speed (uneven, too high, too low)
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Idle speed or CO content too high (cannot be adjusted)
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Transition when accelerating (jerking)
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Transition at high engine speeds (to 2nd stage)
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Backfiring during coasting
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Performance (too low, misfiring at full load)
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Fuel consumption too high
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Cause
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Remedy
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Incorrect operation
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Start as instructed
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Driving conditions/incorrect driving
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Check consumption; advise customer
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Fuel quality not as prescribed
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Change fuel
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Icing
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Change fuel/check preheater
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Dirt in carburettor/water damage
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Clean carburettor, possibly replace
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Throttle valve shaft worn out
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Replace carburettor
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Nozzle assembly not as prescribed
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Replace nozzles
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Fuel evaporates (over-rich supply to engine)
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Hold pedal at full load and start/try different brand of
fuel
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Choke valve does not close completely
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Adjust choke/check bi-spring
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Choke valve or accelerator difficult to move or jams
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Free
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Choke valve gap incorrect
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Adjust
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Pulldown unit leaky or defective
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Check, replace if necessary
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Choke heating, intake manifold preheater and thermo switch
not in order; coolant flow disturbed
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Check heating coil, thermo switch and contacts; check
coolant flow
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Stepped disc sticking; wrong position; return springs
defective
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Free or adjust, replace carburettor cover, if necessary
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Cold start adjustment, throttle valve gap incorrect
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Adjust fast idle or throttle valve gap
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Idle adjustment incorrect
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Correct
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Idle cutoff valve does not open
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Check, replace if necessary
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Idle fuel air nozzle dirty
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Clean, replace if necessary
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Injection quantity
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Check, adjust if necessary
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Enrichment valve defective
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Replace
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Enrichment tube incorrect, bent
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Check, replace if necessary
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Float needle valve leaky
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Clean valve, replace needle if necessary
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Float defective/level incorrect
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Replace float
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False air at seals or flange
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Replace seals
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Throttle valve does not open fully
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Correct accelerator actuation
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Vacuum unit, 2nd stage, leaky; pull rod
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Replace or adjust incorrect
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