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Cold start (starting)
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Warming up (stalling after
cold starting)
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Cold idle speed too high/too
low
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Cold driving
characteristics/transition (pick-up poor, bucking)
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Warm start (starting time over 5 s)
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Idle speed (uneven, too high, too slow)
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Idle speed or CO content too high (cannot be
adjusted)
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Transition when accelerating (bucking, flat spot in
acceleration)
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Backfiring during engine braking
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Performance (too low, missing 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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*
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*
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Pulldown unit leaks
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Check
for leaks: replace if necessary
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*
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Fuel vapour escapes (engine flooded)
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Hold
pedal to floor and start (do not pump)
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*
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*
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Idle speed fuel/air jet or auxiliary fuel/air jet
dirty or loose
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Clean
or tighten
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*
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*
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*
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*
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*
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Idle speed adjustment incorrect
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Correct
idle speed
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*
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Mixture control screw damaged
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Replace
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*
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*
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Throttle valve basic adjustment incorrect
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Adjust
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*
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*
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Injection quantity, injection tube closed
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Correct
or clean: check pump valve
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*
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*
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Pump diaphragm defective, pump control lever sticks
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Replace
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*
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*
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*
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Enrichment
diaphragm defective
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Replace
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*
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Float needle sticks or needle valve not sealed
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Clean
valve and replace if necessary
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*
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Float adjustment incorrect
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Adjust
float
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*
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*
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*
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*
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*
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*
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Air leak at cover gasket or flange
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Replace
seal
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*
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Throttle valve does not open
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Check
accelerator cable
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*
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*
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Jets not as specified
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Replace
jets
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*
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Operating conditions
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Measure
consumption; inform customer
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